JupyterLab Changelog


See the JupyterLab 3.0 milestone on GitHub for the full list of pull requests and issues closed.

User-facing changes

Extensions can be installed without building JupyterLab with NodeJS

In JupyterLab 3.0, a new recommended way of distributing and installing extensions as Python pip or conda packages is available. Installing such extensions does not require rebuilding JupyterLab and does not require having NodeJS installed. The previous way of distributing extensions as npm packages requiring rebuilding JupyterLab is still available as well. See the documentation for more details.

The JupyterLab interface supports multiple languages

JupyterLab now provides the ability to set the display language of the user interface. See the documentation for more details.

A new visual debugger

JupyterLab now ships with a debugger front-end by default, available for kernels that support the new debugging protocol. See the documentation for more details.

Improvements to Single Document Mode and Mobile

The single-document user interface is now more streamlined. JupyterLab now supports showing the current file in use in the browser URL bar, similar to the classic Jupyter Notebook.

Table of Contents is now in core

The popular Table of Contents extension is now part of core JupyterLab. This core extension makes it easy to see an outline view of notebooks and other documents.

Visual filter in file browser

The file browser now has a filter input which filters the list of files using the same fuzzy matching as the command palette.

For Developers

Federated Extensions

Users will typically consume federated extensions, which are Python packages with static assets built using JupyterLab. See the updated APOD tutorial for the workflow of creating a federated extension from scratch. For existing extensions, there is a new python -m jupyterlab.upgrade_extension script that can be used to upgrade extensions. The script will update the relevant dependencies and add the boilerplate to create the Python package. For extensions that already contained Python packages (typically server extensions), the files are not overwritten, and some manual copying of content is required. See the example, which used this script heavily. There are two highlighted commits that demonstrate upgrading a server extension.

  • Clean up federated extension install and upgrade (#8974)
  • Add --development and --source-map flags for building extensions. (#8961, #8952)
  • Add extension upgrade script (#8950, #8870, #8869)
  • Improved handling of disabled extensions (#8944, #7481)
  • Add development mode to lab extension build scripts (#8918)
  • Pull federated extension loading data from the webpack compilation (#8913, #8842)
  • Update labextension build cli to include a parameter for setting the webpack publicpath option (#8911)
  • Update apod extension tutorial (#8905, #8859)
  • Let webpack automatically determine the required version of dependencies (#8875)
  • Fix rebuild of federated extension and add discovery metadata to schema (#8874)
  • Fix build issues with publicpath (#8871)
  • Split buildutils into buildutils and builder (#8863, #8857)
  • Dynamically set public path in generated extensions according to page config (#8861, #8827)
  • Clean up federated extension cli (#8855, #46)
  • Fix app example. (#8852)
  • Add lumino dependencies to buildutils so the phosphor webpack aliasing works (#8850, #8822)
  • Add another federated example package. (#8847, #5)
  • Fixes for the federated example (#8846)
  • Add slash to publicpath (#8845)
  • Update watch plugin for webpack 5 (#8841, #8705)
  • Adding a mime extension to the webpack config (#8825)
  • Fix labextension build (#8821)
  • Fix boolean error (#8819)
  • CI and extension developer cleanup (#8810)
  • Adding extension to shared modules list (#8808)
  • Module federation implementation (#8802)
  • Fix examples and update webpack (#8779, #8767)
  • Add extension building scripts (#8772)
  • Keep the existing webpack file in staging (#8673)
  • Workaround for vega build error (#8666)
  • Add missing polyfill (#8664, #8660)
  • Add url as a polyfill dependency for apputils. (#8659, #8657)
  • Update to webpack 5b21 (#8651)
  • Fix examples and break into separate build (#8647, #8646)
  • Add cur extension for url-loader (#8634)
  • Experiment with module federation (#8385)

Jupyter Server

JupyterLab 3.0 uses Jupyter Server instead of the classic Notebook server. Existing server extensions will be shimmed, but it is advised to update extensions to use jupyter_server.

  • Enable JupyterLab to run as an old notebook server extension (#8956, #8943)
  • Fixed static_url_prefix, added classic notebook flags and aliases, and bumped jupyterlab_server dependency (#8910)
  • Use favicons provided by jupyter_server (#8898, #8794)
  • Load app_version next to running on jupyter_server (#8889, #8812)
  • Reinstate the labhubapp (#8806, #8704)
  • Jupyterlab as server extension (#7416)


The JupyterLab UI now supports translation.

  • Add options to add prefix to strings (#8946)
  • Add a standalone translation manager to be used outside of plugins (#8945)
  • Add missing string fixes (#8888)
  • Add crowdin badge (#8823)
  • Change optionsmap to a an array of tuples to be able to localize the options (#8820)
  • Localize strings in jlab (#8800)
  • Add translation package (#8681)

Visual Debugger

  • Fix invisible breakpoint in debugger (#8908)
  • Port jupyterlab/debugger PR #527 to JupyterLab (#8878)
  • Add jupyterlab debugger to core (#8747, #75)

Table of Contents

  • Add tests for the toc (#8757, #8558)
  • Change toc to use labicon (#8692, #8557)
  • Switch from using settings registry to a signal for notebook collapsing behavior in toc (#8601)
  • Remove husky dependencies from toc and toc-extension (#8571)
  • Merge toc extension into core (#8538)


  • Upgrade to TypeScript 4 (#8883)
  • File browser filter (#8615)
  • Allow to substitute the default completer renderer (#8930, #8926)
  • Update dependencies for beta (#8921)
  • Test cleanup (#8894)
  • Resize isolated iframes on content height change (#8909, #5696)
  • Update minimum python version to python 3.6. (#8903)
  • Update yarn.lock (#8862)
  • Makes some properties and methods of class dsvmodel accessible outside the class. (#8849, #8848)
  • Do not use token parameters in websocket urls (#8835, #8813)
  • Use blocked/allowed extension naming in jupyterlab (#8799, #8533)
  • Create icon for pdfs in the filebrowser (#8791)
  • Correctly set base_url on workspace apps (#8788)
  • Pass in isessioncontextdialogs to notebookwidgetfactory (#8778)
  • Update encoding version in vega sample. (#8766)
  • Upgrade codemirror (#8739)
  • Rename the logconsole:nboutput plugin id (#8729)
  • Rename the celltags plugin id to @jupyterlab/celltags (#8728)
  • Uncaught typeerror when switching kernels (#8727)
  • Change inspector detail_level to 1 (#8725)
  • Change main menu ranks to allow for application menu to l of file (#8719)
  • Handle errors in async browser_check (#8717, #8709)
  • Add mehmet and andrew to contributors, fix last name order (#8712)
  • Updated puppeteer version to v4.0.0 (#8707)
  • Update the singleton packages to include at least every package with a ‘tokens.ts’ file (#8703)
  • Update link to jupyter contributing guide (#8697, #8682)
  • Added ability to delete a document from titlebar context menu (#8670)
  • Move codemirror html tree and related css to shadow dom (#8584)
  • Support macoptionismeta option in terminal (#8573, #4236)
  • Align output baseline with prompt (#8561, #8560)
  • Use the same font-family for cell prompt and code (#8553, #8552)
  • Prompt to save files before rebuild (#8526, #7372)
  • Change json5 payload to json payload (#8225)
  • Move notebook logging plugin to notebook-extension package (#7830)
  • First pass at adding scroll to cell method (#6818)
  • Add a debugger section to the user docs and contributing guide (#8977)

Single Document Mode and Mobile Enhancements

  • Improved url scheme, state, interactions for single document mode (#8715)
  • Add workspace mime handler and loading/saving workspaces manually (#8691)
  • Modify ansi color fix (#8555, #8554)
  • Improve single document mode to address classic notebook usage cases (#8531)
  • Incrementally improve jupyterlab mobile ux (#8456)

Benchmarks (now a separate repository)

  • Move benchmarks to seperate repo (#8795)
  • Fix off by one error in benchmark samples (#8785)
  • Benchmark params configurable and increase timeout (#8786)
  • Benchmarks: new erroroutputs + larger timeout + notebook defs in subfolder (#8783)
  • Add ability to compare benchmarks (#8737)
  • Benchmark notebook loads (#8020)


  • Update mimetype for dragging files (#8965, #8934)
  • Fix comment explaining the extension entry point. (#8964)
  • Security docs: link to jupyter-server instead of jupyter-noteboook (#8954)
  • Fix titles in the extension development docs (#8948)
  • Fix link syntax in the apod tutorial (#8942)
  • Fix codemirror text color issue with dark jupyter theme. (#8919, #8792)
  • Remove the extension path, not the entire extension directory, when uninstalling an extension (#8904)
  • Header 'content-type' should not be overwritten (#8891, #8890)
  • Make sure adding or removing a cell tag actually replaces the tag list, so a changed signal is emitted for the cell metadata (#8751, #8534)
  • Fix up ensure package and repo (#8749, #8748)
  • Add comma in extension_points.rst to fix syntax error of code (#8745)
  • Fix: Contributing Guide Link is Out of Sync (#8665)
  • Fix api docs links (#8624, #8616)
  • Fix handling of disposed widgets after closing a panel in tutorial (#8623)
  • Fix small typos in docs for developing extensions (#8622)
  • Reload the application on manual state reset (#8621)
  • Remove superfluous page reload on workspace reset (#8619)
  • Remove superfluous console log from the application shell (#8618)
  • Fix minor typos in extension tutorial (#8613)
  • Fix minor typos in docs for extensions. (#8551)
  • Fix small typo in install docs (#8550)
  • Fix more linting errors (#8454)
  • Reconnect a websocket when a kernel is restarted. (#8432)


See the JupyterLab 2.2 milestone on GitHub for the full list of pull requests and issues closed.

July 2020

We are very excited to add Eric Charles to the core team this month! (#8513)

User-facing changes

  • Cells can no longer be executed while kernels are terminating or restarting. There is a new status for these events on the Kernel Indicator (#8562, #8477)
  • Adds a visual clue for distinguishing hidden files and folders in the file browser window (#8393)
  • Enable horizontal scrolling for toolbars to improve mobile experience (#8417)
  • Improves the right-click context menu for the file editor (#8425)
  • Merge cell attachments when merging cells (#8427, #8414)
  • Add styling for high memory usage warning in status bar with nbresuse (#8437)
  • Adds support for Python version 3.10 (#8445)
  • Support live editing of SVG with updating rendering (#8495, #8494)

For developers

  • Specify that we recommend typescript over javascript for extensions (#8411)
  • Lazy load codemirror theme stylesheets. (#8506)
  • Increase the link expiry to one week (#8402)
  • Add documentation on private npm registry usage (#8455, #7827, #7660)
  • Add feature request template + slight reorg in readme (#8467)
  • Add link to react example in extension-examples repo (#8474)
  • Update documentation of whitelist/blacklist (#8540)
  • Improve whitelist figure description in documentation (#8517)


  • Typo: fix extensino to extension (#8512)
  • Close correct tab with close tab (#8529)
  • Remove unused css rules (#8547, #8537)
  • Fix small typo in getting started docs, proxy (#8549)
  • Fix link on CI badges (#8603)
  • Simplified multicursor backspace code (#8523)
  • Fix recent breaking changes to normalizepath in filebrowser (#8383, #8382)
  • Fix watch mode and add ci test (#8394)
  • Address CI failures (#8433)
  • Fix lint errors in dependency graph script (#8451)
  • Fix lint complaints coming up from github actions (#8452)
  • Address CI usage test timeout (#8464)
  • Add chokidar to dev_mode/package.json (#8481)
  • Fix autolink (#8496)
  • Update phosphor aliases (#8498)
  • Fix default return in Python when extension has no version metadata (#8430)
  • Updated the installation documentation on read the docs to match the readme file on the repo (#8386)
  • Handle quit_button when launched as an extension (#8486, #8483)
  • Add worker-loader (#8593, #8587)



  • Fix icon sidebar height for third party extensions (#8333)
  • Pin JupyterLab server requirement more tightly (#8330)
  • Scrolls cells into view after deletion (#8287)
  • Sets data attribute on file type in filebrowser (#8275)


  • Pin puppeteer to fix ci (#8260)
  • Fix Save As for files without sessions (#8248)


April 2020

See the JupyterLab 2.1 milestone on GitHub for the full list of pull requests and issues closed.

User-facing changes

  • Display the extension manager in the left sidebar by default. Users will need to acknowledge the disclaimer in the extension manager before using it. (#8050, #8145)
  • Added blacklist and whitelist support <extension_listings> for the extension manager (#7989)
  • Automatically link URLs in notebook output text (#8075, #7393)
  • Added a “Restart Kernel and Run All Cells…” button to the notebook toolbar (#8024)
  • Added a context menu item for opening a Markdown editor from the Markdown preview (#7942)

  • Support Node.js 10+ (#8112, #8083)

  • Added a command to replace the selection in an editor with text (inserting if there is no selection). This can be assigned a keyboard shortcut, as shown below. We also added a command to go through a series of commands and run the first enabled command. (#7908) Here is a keyboard shortcut to insert text in a currently-active notebook editor:

      command: "notebook:replace-selection",
      selector: ".jp-Notebook",
      keys: ["Ctrl L"],
      args: {text: "lambda x: x"}

    Here is a keyboard shortcut to insert text into an editor of the currently active console, file editor, or notebook:

      command: "apputils:run-first-enabled",
      selector: "body",
      keys: ["Ctrl L"],
      args: {
        commands: [
        args: {text: "lambda x: x"}

For developers

  • NotebookWidgetFactory is now a plugin so it can be overridden (#8066, #7996)
  • Many improvements to LabIcon: work with all SVG loaders, improve performance, fix issue with menus from extensions (#8125)
  • Change the header application area to a box panel, which means the header area will display if its children set their minimum height (#8059, #7279)
  • JupyterLab’s custom context menu is now disabled on all descendants of a DOM element with a data-jp-suppress-context-menu attribute (#7877, #7670)


  • Fix property inspector restoration on reload (#8114)
  • Increase the timeout for yarn (#8104, #8102)
  • Fix find and replace with empty strings (#8100, #8098)
  • Select search text when focusing the search overlay (#8073, #7932)
  • Fix attaching images with spaces in their names to Markdown cells (#8095)
  • Fix build errors by distributing the .yarnrc configuration with the Python package (#8045)
  • Throttle fetch requests in the setting registry’s data connector (#7927)
  • Close the gap between lines in notebook output (#7832, #7760)


April 2020

See the JupyterLab 2.0.2 milestone on GitHub for the full list of pull requests and issues closed.

  • Fix cell execution when recording timing (#8057, #8056)
  • Fix font settings for the editor (#8004, #7910)
  • Avoid redundant checkpoint calls on loading a notebook (#7926, #7889)
  • For developers: make kernel IFuture.done typings more correct by not including undefined (#8032)


February 2020

Here are some highlights for this release. See the JupyterLab 2.0 milestone on GitHub for the full list of pull requests and issues closed.

User-facing changes

  • New user interface for notebook cell tags (#7407, #7786)
  • File info display when hovering on a file in the file browser (#7485, #7352)
  • Support for searching outputs in notebooks (#7258)
  • Ctrl Shift . and Ctrl Shift , shortcuts move focus to the next and previous tab bar in the main area, respectively (#7673)

  • Shift Home and Shift End shortcuts in a notebook select all cells from the current cell to the top or bottom of a notebook, respectively (#7177)

  • Explicit “No Kernel” button in the kernel selection dialog for new notebooks (#7647)

  • Notebook recordTiming advanced setting to control whether execution timing information is stored in notebook files (#7578)

  • “Select current running or last run cell” command added (requires notebook recordTiming advanced setting to be set to true) (#7551)

  • Codemirror lineWiseCopyCut advanced setting to control the behavior of the copy/cut keyboard shortcuts when there is no selection (#7842)

  • Refreshed the command palette and property inspector sidebar icons and user interfaces (#7577, #7038, #7733, #7732, #7718, #7686)

  • “New File” and “New Markdown File” items in file browser context menu (#7483, #4280)

  • “Download” item in File menu (#7480)

  • “Restart Kernel and Run up to Selected Cell” item in notebook Kernel menu (#7789, #6746)

  • In extension manager, the “enable” button is now only shown for installed extensions (#7482)

  • Dialogs can now be closed by clicking outside of them (#7885, #3784)

  • documentsearch:startWithReplace command to open the document find overlay with replace. There is not currently a default keyboard shortcut for this, but one can be assigned as a custom keyboard shortcut in Advanced Settings. (#7725)

  • # added to the CSV Viewer delimiter options (#7367, #6324)

  • The JSON viewer now only displays structure hints for arrays and empty objects for a more streamlined feel (#7227)

  • Optional platform-aware keyboard shortcut fields linuxKeys, macKeys, and winKeys in keyboard shortcut definitions (#7589)

      command: "application:toggle-mode",
      selector: "body",
      linuxKeys: ["Ctrl Shift M"], // only linux
      macKeys: ["Cmd Shift Z"], // only mac
      winKeys: ["Ctrl Shift B"], // only windows
      keys: ["Accel Shift U"] // default shortcut
  • Added options for jupyter lab clean to clean specific parts of the build, such as --extensions, --settings, --static, and --all (#7583, #6734)

  • Removed the vega 4 and vega-lite 2 renderers (vega 5 and vega-lite 4 is included in JupyterLab by default). These legacy renderers may be available via custom extensions (#7650, #7523, #7658)

  • JupyterHub users should use the c.Spawner.default_url = '/lab' setting instead of the deprecated and now removed labhubapp (#7724)

For developers

See JupyterLab 1.x to 2.x Extension Migration Guide for help in migrating extensions to JupyterLab 2.0.

Backward incompatible changes

  • Switch from @phosphor to @lumino dependencies. (#7582, #7534, #7763, #7762, #7595)
  • Factor out the settingsregistry and statedb packages from coreutils (#7681, #7615)
  • Rework services architecture (sessions, kernels, terminals). Among these changes, ClientSession is renamed to SessionContext and the IKernelConnection.connectToComm method is replaced with IKernelConnection.createComm and IKernelConnection.hasComm methods. (#7252, #7674, #7820, #7694, #7690, #7682)
  • Upgrade to TypeScript 3.7 (#7522)
  • Remove polling from coreutils in favor for @lumino/polling (#7617)
  • TypeScript strict null checking in core packages (#7657, #7607)
  • Update state database list method to query based on namespace match. (#7742, #7257)
  • Address code todo items and deprecations for 2.0 (#7720, #7724)
  • Update Console panel tracker widgets (#7705, #7726, #7648, #7645)
  • Update contribution guide to require node v12+ (#7479)
  • New API for the Running sidebar extension (#6895, #6876)
  • Clean up handling of icons under unified LabIcon ( #7192 #7700, #7765, #7767, #7800, #7846, #7859, #7864, #7886)

Other changes

  • New property inspector used to display the properties of the currently selected main area widget (#7665, #7664, #7718, #7686)
  • Allow metadata for launcher items (#7654, #7652)
  • Allow default file browser to restore manually. (#7695, #4009)
  • Upgrade bundled yarn to 1.21.1 (#7691, #7692)
  • Make session dialogs configurable (#7618, #7616)
  • Support transient editor configs (#7611, #7295)
  • Optionally force new browser tab (#7603, #7602)
  • Update core dependencies (e.g., codemirror, xterm.js, markdown, fontawesome, etc.) (#7590, #7194, #7326, #6479, #7769)
  • Add storybook to ui-components (#7588, #6799)
  • Add explicit documentation encouraging people to re-use lab components (#7543)
  • Enable TypeScript sourcemaps for debugging locally installed labextensions (#7541)
  • Add UseSignal example to the docs (#7519)
  • Add env prop to kernel options (#7499)
  • Add kernelspec metadata (#7229, #7228)
  • Allow different mimetypes for the clipboard data (#7202)
  • Add password dialog to apputils (#7855)
  • Alias phosphor packages to lumino to allow a deprecation period for phosphor (#7893)
  • Match react version in ui-components peerdependencies (#7794)
  • Fix lint-staged for both win and mac (#7784)
  • Update websocket workaround for node environments (#7780, #6934)
  • Fix handling of linked extensions (#7728, #6738)
  • Fix extension compatibility checks for prereleases and extensions supporting multiple major versions of JupyterLab (#7723, #7241, #7919)
  • Teach update-dependency about more range specifiers and make it adopt the current range for any tag (#7709)
  • Add support for giving a rank to items in the top area (#7278)
  • Apply all options to the initial JupyterLab application instance (#7251)


  • “Copy Shareable Link” in the file browser context menu now properly works in JupyterHub (#7906)
  • Update Mathjax CDN in the cell and console examples (#7680)
  • Revert ensure-max-old-space now that Node 12+ has better default memory ceilings (#7677, #7675)
  • Resolve race condition between default file browser and tree urls. (#7676, #4009)
  • Fix handling of code editor refresh (#7672, #7671)
  • Start new notebooks in edit mode (#7666, #6731)
  • Use consistent versions of React (#7661, #7655)
  • Add scrollbar styles to nbconvert-css (#7653)
  • Close output views when corresponding notebooks are closed (#7633, #7301)
  • Fixed incorrect white background for new command palette icon (#7609, #7577)
  • Block fetching the settings for a plugin that is disabled (#7147)
  • When timing metadata changes, ensure signal fires (#7576)
  • Prevent memory leaks in Vega renderer (#7564)
  • Handle cell execution cancellation when cell is disposed (#7555, #7554)
  • Fix dropdown option style issue on Windows (#7513)
  • Make sure label is linked to a control when checking for element type (#7458)
  • Refine log console message UX (#7448, #7444, #7443)
  • Fix multicursor backspacing (#7401, #7205)
  • Reset log display and count when non-notebook tab gets activated (#7334, #7325)
  • Fix Safari multiple tabs by working around a Safari bug. (#7316, #6921)
  • Skip custom click behavior on links when the download attribute is set (#7311, #5443)
  • Fix context menu hit test to deal with SVG nodes. (#7242, #7224)
  • Fix overwriting of target attribute of anchors rendered by IPython.display (#7215, #6827)
  • Fix file browser location in tree view (#7155)
  • Stop too many fetch calls in docmanager-extension (#7879, #7874)
  • Ensures that Shift Tab dedent shortcut works correctly in the file editor (#7865)
  • Fix unexpected jump to last search result when using documentsearch (#7835)
  • Fixed refresh issue for html viewer (#7824, #7552)
  • Fix for center-aligned images with IPython.display.image (#7798)
  • Changes to setting editor should trigger application dirty state (#7774, #7757)
  • Move vega from “devdependencies” to “dependencies” (#7699, #7689)
  • Restore default file browser manually. (#7695, #4009)
  • Use default app_dir when app_dir is '' (#7268, #7264)


October 29, 2019

Here are some highlights for this release. See the JupyterLab 1.2.0 milestone on GitHub for the full list of pull requests and issues closed.

User-facing changes

  • Select cells from the current cell to the top of the notebook with Shift Home, to the bottom of the notebook with Shift End (#7336, #6783)
  • Add a log console extension to display unhandled messages and other activity (#7318, #7319, #7379, #7399, #7406, #7421)
  • Allow the npm max-old-space option to be specified outside of JupyterLab (#7317)
  • Only display node structure in a JSON tree view for arrays and empty objects (#7261)
  • Make much smaller distribution packages by not building JavaScript source maps for releases. (#7150)
  • Add support for pasting cell attachments and dragging attachments from the file browser (#5913, #5744)
  • Add a new registry configuration parameter to override the default yarn repository when building (#7363, #7109, #7249, #7248)

For developers

  • Update the Markdown renderer (marked) to 0.7.0 (#7328)
  • Remove datagrid as a singleton, allowing extensions to use newer versions (#7312)
  • Add metadata to the kernelspec information (#7234)
  • Allow different mimetypes for the clipboard data (#7233)
  • Add inline svg icon support to toolbar buttons (#7232)
  • Add PageConfig functions to query if a plugin is deferred or disabled (#7216)
  • Allow for renderers for nbformat.ierror to be created (#7203, #7193)
  • Refactor fileeditor-extension for modularization (#6904)
  • Add execution timing to cells (#6864, #3320)


  • Fix the file-browser-path query parameter (#7313)
  • Skip custom click behavior on links when the download attribute is set (#7323)
  • Fix opening multiple browser tabs in Safari (#7322)
  • Fix context menus on SVG icons (#7263)
  • Fix overwriting of target attribute of anchors rendered by IPython.display (#7231)
  • Fix multi-cursor backspacing (#7205, #7401, #7413)
  • Fix mult-cursor cell splitting (#7207, #7417, #7419)


August 28, 2019

Here are some highlights of what is in this release. See the JupyterLab 1.1.0 milestone on GitHub for the full list of pull requests and issues closed.

User-facing changes

  • jupyter lab build now has a --minimize=False option to build without minimization to conserve memory and time (#6907)
  • Fix workspace reset functionality (#7106, #7105)
  • Restore behavior of the “raises-exception” cell tag (#7020, #7015)
  • Add settings to override theme font sizes (#6926)
  • Accept query parameter to optionally change file browser location (#6875)
  • Pressing escape in the console should switch out of edit mode (#6822)
  • Fix file browser downloads in Google Chrome (#6686)
  • Make it possible to override the default widgets to view a file (#6813, #4048)
  • Support installing multiple versions of the same extension (#6857)
  • Support JupyterHub server name for JupyterHub 1.0 (#6931)
  • Add docs to help users diagnose issues before creating them (#6971)
  • The JupyterLab conda-forge package is now a noarch package. If you are using JupyterLab with notebook version 5.2 or earlier, you may need to manually enable the JupyterLab server extension. See the issue for more details (#7042)

For developers

  • Expose install_kernel for tests so that outside projects can better use the testing framework (#7089)
  • Fix comm_info_request content to conform to the Jupyter message specification in a backwards-compatible way (#6949, #6947)
  • Add yarn package resolution to build to constrain core package versions to patch semver ranges (#6938)
  • Make handling comm messages optional in a kernel connection. (#6929)
  • Expose icon svg to theme css (#6034, #7027)
  • Expose convenience functions for open dialogs (#6366, #6365)
  • Add debug messages to possible kernel messages (#6704)
  • Add server side coreconfig object (#6991)

Bug fixes

  • Handle errors that occur during kernel selection (#7094)
  • Fix escaping issues for page config and other template variables (#7016, #7024, #7061, #7058, #6858)
  • Require jinja2 2.10+ to fix escaping issues (#7055, #7053)
  • Increase the search debounce from 100ms to 500ms to increase incremental search responsiveness in large documents (#7034)
  • Fix vega downloads and download urls in general (#7022, #7017, #7098, #7047)
  • Do not complain in the build about duplicate or optional packages (#7013)
  • Fix contextual help layout for R help (#6933, #6935)


June 28, 2019

See the JupyterLab 1.0.0 milestone on GitHub for the full list of pull requests and issues closed in 1.0.0, and other 1.0.x milestones for bugs fixed in patch releases.

Find and Replace

We have added first class support for find and replace across JupyterLab. It is currently supported in notebooks and text files and is extensible for other widgets who wish to support it. (#6350, #6322, #6301, #6282, #6256, #6241, #6237, #6159, #6081, #6155, #6094, #6024, #5937, #5795, #1074)

Status Bar

We have integrated the JupyterLab Status Bar package package into the core distribution. Extensions can add their own status to it as well (#5577, #5525 #5990, #5982, #5514, #5508, #5352).

JupyterHub Integration

  • We now include the JupyterHub extension in core JupyterLab, so you no longer need to install @jupyterlab/hub-extension. (#6451, #6428)
  • JupyterLab now has a File > Logout menu entry when running with JupyterHub (#6087, #5966)


We now have a printing system that allows extensions to customize how documents and activities are printed. (#5850, #1314)

Other User Facing Changes

  • The launcher displays longer kernel names and supports keyboard navigation (#6587)
  • Notebook outputs without any valid MimeType renderers will not be displayed, instead of displaying an error (#6559, #6216)
  • Add tooltip to file browser root breadcrumb icon showing the server root, if it is available (#6552)
  • Downloading a file will no longer open a new browser window (#6546)
  • Rename the help “Inspector” to “Contextual Help” and move it to the “Help” menu (#6493, #6488, #6678, #6671)
  • Update many of the icons to make them more consistent (#6672, #6618, #6664, #6621)
  • Update the settings UI to remove the table view (#6654, #6622, #6653, #6623, #6646, #6642)
  • Replace FAQ Extension with link to JupyterLab documentation (#6628, #6608, #6625, #6610)
  • Change the default keyboard shortcut for closing a tab to be Alt+w instead of Cmd/Ctrl+w to avoid conflicts with operating systems. (#6486, #6357)
  • Show help text in Inspector window to describe you should select a function (#6476)
  • Fixes SVG rendering (#6469, #6295)
  • Add support for dropping a tab in the tab bar area. (#6454, #5406)
  • Switch some default shortcuts to use Accel instead of Ctrl so they are more natural for Mac users (#6447, #5023)
  • Add ability to tell between hover and selected command palette items (#6407, #279)
  • Hide the “Last Modified” column when the file browser is narrow (#6406, #6093)
  • Support copy/paste in terminal and Mac OS using Ctrl+C and Ctrl+V (#6391, #6385, #1146)
  • Support scrolling in running kernels panel (#6383, #6371)
  • Adds ability to “Merge Selected Cells” in the context menu in the notebook (#6375, #6318)
  • Turn On Accessibility In Xterm.js to make it more compatible for screen readers (#6359)
  • When selecting cells using the keyboard shortcuts, we now skip collapsed cells (#6356, #3233)
  • Supporting opening .geojson files in JSON viewer (#6349)
  • Performance fixes for text-based progress bars (#6304, #4202)
  • Add support for rendering Vega 5 and Vega Lite 3 while keeping the existing Vega 4 and Vega Lite 2 renderers (#6294, #6133, #6128, #6689, #6685, #6684, #6675, #6591, #6572)
  • Drag and drop console cells into a notebook or text editor (#5585, #4847)
  • Drag and drop notebook cells into a console or text editor (#5571, #3732)
  • The extension manager search now sorts extensions by the score assigned to them by NPM instead of alphabetically (#5649)
  • Notify the user when a kernel is automatically restarted, for example, if crashes from an out of memory error (#6246, #4273)
  • Expose the extension manager in a command and menu item (#6200)
  • Add command to render all Markdown cells (#6029, #6017)
  • Supports using shift to select text in output area (#6015, #4800)
  • Output areas that opened in new views are restored properly now on reload (#5981, #5976)
  • Add support for managing notebook metadata under a new “Advanced Tools” section in the cell tools area. The cell and notebook metadata now always reflect the current state of the notebook (#5968, #5200)
  • Inherit terminal theme from core theme (#5964)
  • Adds a built-in HTML viewer so that you can view HTML files (#5962, #5855, #2369)
  • New workspaces are now automatically generated when you create a new window with the same workspace name. (#5950, #5854, #5830, #5214)
  • We now add a hint to the context menu to describe how you can access the native browser menu (#5940, #4023)
  • The tabs on the left panel have changed to make them more understandable (#5920, #5269)
  • Start a new terminal when the page is refreshed and the old terminal has died (#5917)
  • Add a command to open the main menus, which can be assigned to a keyboard shortcut to open and navigate menus without a mouse (#5910, #3074)
  • The contextual help now updates based on changes in the cursor from the mouse instead of just from the keyboard (#5906, #5899)
  • The launcher now updates when the kernels change on the server (#5904, #5676)
  • Retain cell auto scroll behavior even when a cell output is cleared (#5817, #4028)
  • If you link to a relative path that is not a file in a markdown cell, this will now be preserved instead of changing it to a file URL (#5814)
  • Adds the ability to link to a certain row in a CSV file and have the viewer open to that row (#5727, #5720)
  • We have improved the performance of switching to a large notebook (#5700, #4292, #2639)
  • The vdom extension now supports event handling, so that you can have kernel code run in response to user interaction with the UI (#5670)
  • Adds the ability to run “Run All Code” and “Restart Kernel and Run All Code” in code and markdown files (#5641, #5579)
  • We now remember what line ending a text file has when loading it, so that files with CRLF line endings will properly be saved with the same endings (#5622, #4464, #3901, #3706)
  • Fixes rendering of SVG elements in HTML MimeType output (#5610, #5610, #5589)
  • Allow copying files by holding down Ctrl when dragging them in the file browser (#5584, #3235)
  • Switch the hover modified time in the file browser to use the local format (#5567)
  • We have added a default keyboard shortcut of Ctrl Shift Q for closing and cleaning up a file (#5534, #4390)
  • Adds the ability to find and go to a certain line in the CSV viewer (#5523)
  • Add the ability to create new text and markdown files from the launcher and command palette (#5512, #5511)
  • A “New Folder” option has been added to the file browser context menu (#5447)
  • The ANSI colors are now the same as those in the classic notebook (#5336, #3773)
  • Send complete statements instead of current lines when stepping through code in a cell (#6515, #6063)
  • Description list styles (dl, dt, dd) are improved to be consistent with the nteract project (#5682, #2399)


  • The settings system has been rewritten (#5470, #5298) and now uses json5 as the syntax, which supports comments and other features for better human readability (#6343, #6199).
  • The keyboard shortcut system has been rewritten and now displays a list of system commands in the settings comments (#5812, #5562).

There are new settings for many following items, including:

Command Line Changes

  • Installing extensions will be quieter and adds a --debug to extension installing (#6567, #6499, #5986)
  • We now support running JupyterLab when its application directory is a symlink (#6240, #6166)
  • Add --all flag to labextension uninstall to remove all extensions (#6058, #6006)
  • Adds the ability to override the base URLs from the config (#5518, #5503)
  • Updates to workspaces CLI command (#6473, #5977, #6276, #6234, #6210, #5975, #5695, #5694)

Extension Development Changes

  • We have rewritten how extensions provide keyboard shortcuts and interact with the settings system. If you previously defined keyboard shortcuts or used the settings mechanism, you will need to update your extension (#5470, #5298)
  • We have renamed the plugin type from JupyterLabPlugin to JupyterFrontEndPlugin. The application arg is also renamed from JupyterLab to JupyterFrontEnd and some its functionality has been moved to a separate ILabShell plugin (#5845, #5919)
  • The lab shell addToMainArea, addToLeftArea, addToTopArea, addToRightArea, and addToBottomArea functions have been replaced with a single add() function that takes the area as an argument. Replace addToMainArea(widget, options) with add(widget, 'main', options), etc. (#5845)
  • Rename pageUrl to appUrl in the server connection (#6509, #6508, #6585, #6584)
  • MainAreaWidget instances now forward update requests to their content (#6586, #6571)
  • The theme data attributes are renamed and moved to the document body element. If you are relying on these attributes in CSS to conditionally style based on the theme, you should update their names. For example data-theme-light is now data-jp-theme-light. (#6566, #6554)
  • Extensions which require CSS should no longer import their CSS files into their Javascript files. Instead, they should specify a root CSS file in the style attribute in their package.json, and JupyterLab will automatically import that CSS file. (#6533, #6530, #6395, #6390)
  • Dialog.prompt has been replaced by a number of type-specific dialogs such as InputDialog.getString, InputDialog.getBoolean, etc. (#6522, #6378, #6327, #6326)
  • When a RenderMime widget is re-rendered, the default behavior is to remove any existing content in the DOM. This can be overridden if needed. (#6513, #6505, #6497)
  • We have updated our internal TypeScript version to 3.5.1 and our compile target to ES2017. Extensions may need to upgrade their TypeScript version and target as well. (#6440, #6224)
  • We have updated the typings for some of the Kernel messages so that they better match the spec. (#6433)
  • A connectionFailure signal has been added to some of the manager classes, which can be used to detect when a connection to the server is lost (#6399, #6176, #3324)
  • Add rate limiting and polling utilities to coreutils to use for throttling and debouncing of API requests (#6345, #6346, #6401, #6305, #6157, #6192, #6186, #6141, #3929, #6141, #3929, #6186, #6192, #6401 ,`#6305 <https://github.com/jupyterlab/jupyterlab/pull/6305>`__, #6157)
  • Require session when instantiating terminal widget (#6339, #5061)
  • Provides a signal to see what items are opened in a directory listing (#6270, #6269)
  • Ads the ability to add widget above the main work area to a top header area (#5936)
  • Renames contextMenuFirst to contextMenuHitTest in the JupyterFrontEnd (#5932)
  • Removes the initialCommand arg from the terminal creation command. (#5916)
  • Adds --jp-code-cursor-width0, --jp-code-cursor-width1, and --jp-code-cursor-width2 variables to the themes to support changing the cursor width if you change the font size (#5898)
  • Adds the ability to insert a new item to the toolbar before or after another item (#5896, #5894)
  • Adds the ability for extensions to register new CodeMirror modes (#5829)
  • We have removed the JUPYTERLAB_xxx_LOADER Webpack loaders, instead you should use the loader directly in the URL as Webpack supports it (#5709, #4406)
  • Adds the ability to handle fragments for document widgets (#5630, #5599)
  • We have added a @jupyterlab/ui-components package that contains reusable React components to be used internally and in extensions. Feel free to use this to create extension UIs with consistent styles (#5538)
  • The showErrorMessage function now lets you customize the buttons it uses (#5513)
  • We now provide helpers for using React components within JupyterLab. If you were previously using ReactElementWidget you should switch to using ReactWidget. (#5479, #5766, #6595, #6595)
  • The share link command has been moved to its own extension so that it can be overridden (#5460, #5388)
  • Creating a new services session now requires passing a kernel model instead of a kernel instance (#6503, #6142)
  • We upgraded the Webpack raw file loader. The new version of the raw loader exports ES2015 modules, so this may require changes in extensions that import files using the raw loader. For example, if you did require('myfile.md') to get the content of myfile.md as a string, you now should import it using ES2015 import syntax, or use require(‘myfile.md’).default.
  • Widget factories now can support custom cloning behavior from an optional source widget (#6060, #6044)
  • We have renamed the type InstanceTracker to WidgetTracker (#6569).
  • In order to add widgets to the main area (e.g. as in the old XKCD extension tutorial), the correct syntax is now app.shell.add(widget) or app.shell.add(widget, 'main'), see here.


October 3, 2018

See the JupyterLab 0.35.0 milestone on GitHub for the full list of pull requests and issues closed.


  • A notebook cell can now be readonly, reflecting its enabled metadata. (#5401, #1312)
  • Add “Go To Line” in the Edit menu for text editors. (#5377)
  • Sidebar panels can now be switched between left and right sidebars. Right-click on a sidebar tab to move it to the other sidebar. (#5347, #5054, #3707)
  • Make the sidebar a bit narrower, and make the minimum width adjustable from a theme. (#5245)
  • Populate the File, Export Notebook As… submenu from the server nbconvert capabilities. (#5217)
  • Server contents managers can now tell JupyterLab to open files as notebooks. For example, several custom contents managers save and open notebooks as Markdown files. (#5247, #4924)
  • Add a command-line interface for managing workspaces. (#5166)
  • Allow safe inline CSS styles in Markdown. (#5012, #1812)
  • Add Quit to File menu when appropriate. (#5226, #5252, #5246, #5280)
  • Rework extension manager user experience. (#5147, #5042)

Dark theme

  • Show a dark splash screen when using a dark theme. (#5339, #5338, #5403)
  • Fix code completion menu for a dark theme. (#5364, #5349)
  • Style CSV viewer for a dark theme. (#5304, #3456)
  • Make Matplotlib figures legible in a dark theme. (#5232)
  • Fix notebook cell dropdown legibility in a dark theme. (#5168)

Bug fixes

  • Various save options in the file menu and toolbar are now disabled when a file is not writable. (#5376, #5391)
  • Kernel selector dialog no longer cuts off kernel names. (#5260, #5181)
  • Fix focus issues with the toolbar. (#5344, #5324, #2995, #5328)
  • Fix toolbar button enabled/disabled status. (#5278)
  • Table alignment is now respected in Markdown. (#5301, #3180)
  • Fix syntax highlighting for Markdown lists. (#5297, #2741)
  • Use the current filebrowser instead of the default one for various commands. (#5390)
  • Fix escaping in link handling to conform to Markdown syntax. This means that spaces in link references now need to be encoded as %20. (#5383, #5340, #5153)

Build system

  • Use Typescript 3.1. (#5360)
  • Use Lerna 3.2.1. (#5262)
  • Node >=6.11.5 is now required. (#5227)
  • Pin vega-embed version to 3.18.2. (#5342)
  • Use Jest for services tests. (#5251, #5282)
  • Make it easier for third party extensions to use the JupyterLab test app and testing utilities. (#5415)
  • Fix jupyter lab clean on Windows. (#5400, #5397)
  • Fix jupyter lab build on NFS. (#5237, #5233)
  • Build wheels for Python 3 only. (#5287)
  • Migrate to using jupyterlab_server instead of jupyterlab_launcher and fix the app example. (#5316)
  • Move Mathjax 2 typesetter to a library package. (#5259, #5257)

For Developers

  • Default toolbar buttons can be overridden, and mime renderers can now specify toolbar buttons. (#5398, #5370, #5363)
  • A JupyterLab application instance can now be given a document registry, service manager, and command linker. (#5291)


August 18, 2018

See the JupyterLab 0.34.0 milestone on GitHub for the full list of pull requests and issues closed.

Key Features

  • Notebooks, consoles, and text files now have access to completions for local tokens.
  • Python 3.5+ is now required to use JupyterLab. Python 2 kernels can still be run within JupyterLab.
  • Added the pipe (|) character as a CSV delimiter option.
  • Added “Open From Path…”” to top level File menu.
  • Added “Copy Download Link” to context menu for files.

Changes for Developers

  • Notebooks, consoles, and text files now have access to completions for local tokens. If a text file has a running kernel associated with its path (as happens with an attached console), it also gets completions and tooltips from that kernel. (#5049)

  • The FileBrowser widget has a new constructor option refreshInterval, allowing the creator to customize how often the widget polls the storage backend. This can be useful to prevent rate-limiting in certain contexts. (#5048)

  • The application shell now gets a pair of CSS data attributes indicating the current theme, and whether it is light or dark. Extension authors can write CSS rules targeting these to have their extension UI elements respond to the application theme. For instance, to write a rule targeting whether the theme is overall light or dark, you can use

    [data-theme-light="true"] your-ui-class {
      background-color: white;
    [data-theme-light="false"] your-ui-class {
      background-color: black;

    The theme name can also be targeted by writing CSS rules for data-theme-name. (#5078)

  • The IThemeManager interface now exposes a signal for themeChanged, allowing extension authors to react to changes in the theme. Theme extensions must also provide a new boolean property isLight, declaring whether they are broadly light colored. This data allows third-party extensions to react better to the active application theme. (#5078)

  • Added a patch to update the uploads for each FileBrowserModel instantly whenever a file upload errors. Previously, the upload that erred was only being removed from uploads upon an update. This would allow the status bar component and other extensions that use the FileBrowserModel to be more precise. (#5077)

  • Cell IDs are now passed in the shell message as part of the cell metadata when a cell is executed. This helps in developing reactive kernels. (#5033)

  • The IDs of all deleted cells since the last run cell are now passed as part of the cell metadata on execution. The IDs of deleted cells since the last run cell are stored as deletedCells in NotebookModel. This helps in developing reactive kernels. (#5037)

  • The ToolbarButton in apputils has been refactored with an API change and now uses a React component ToolbarButtonComponent to render its children. It is now a div with a single button child, which in turn as two span elements for an icon and text label. Extensions that were using the className options should rename it as iconClassName. The className options still exists, but it used as the CSS class on the button element itself. The API changes were done to accommodate styling changes to the button. (#5117)

  • The Toolbar.createFromCommand function has been replaced by a dedicated ToolbarButton subclass called CommandToolbarButton, that wraps a similarly named React component. (#5117)

  • The design and styling of the right and left sidebars tabs has been improved to address #5054. We are now using icons to render tabs for the extensions we ship with JupyterLab and extension authors are encouraged to do the same (text labels still work). Icon based tabs can be used by removing widget.caption and adding widget.iconClass = '<youriconclass> jp-SideBar-tabIcon';. (#5117)

  • The style of buttons in JupyterLab has been updated to a borderless design. (#5117)

  • A new series of helper CSS classes for stying SVG-based icons at different sizes has been added: jp-Icon, jp-Icon-16, jp-Icon-18, jp-Icon-20.

  • The rank of the default sidebar widget has been updated. The main change is giving the extension manager a rank of 1000 so that it appears at the end of the default items.

  • Python 3.5+ is now required to use JupyterLab. Python 2 kernels can still be run within JupyterLab. (#5119)

  • JupyterLab now uses yarn 1.9.4 (aliased as jlpm), which now allows uses to use Node 10+. (#5121)

  • Clean up handling of baseUrl and wsURL for PageConfig and ServerConnection. (#5111)

Other Changes

  • Added the pipe (|) character as a CSV delimiter option. (#5112)
  • Added Open From Path... to top level File menu. (#5108)
  • Added a saveState signal to the document context object. (#5096)
  • Added “Copy Download Link” to context menu for files. (#5089)
  • Extensions marked as deprecated are no longer shown in the extension manager. (#5058)
  • Remove In and Out text from cell prompts. Shrunk the prompt width from 90px to 64px. In the light theme, set the prompt colors of executed console cells to active prompt colors and reduced their opacity to 0.5. In the dark theme, set the prompt colors of executed console cells to active prompt colors and set their opacity to 1. (#5097 and #5130)

Bug Fixes

  • Fixed a bug in the rendering of the “New Notebook” item of the command palette. (#5079)
  • We only create the extension manager widget if it is enabled. This prevents unnecessary network requests to npmjs.com. (#5075)
  • The running panel now shows the running sessions at startup. (#5118)
  • Double clicking a file in the file browser always opens it rather than sometimes selecting it for a rename. (#5101)


July 26, 2018

See the JupyterLab 0.33.0 milestone on GitHub for the full list of pull requests and issues closed.

No longer in beta

In JupyterLab 0.33, we removed the “Beta” label to better signal that JupyterLab is ready for users to use on a daily basis. The extension developer API is still being stabilized. See the release blog post for details. (#4898, #4920)


We added new workspace support, which enables you to have multiple saved layouts, including in different browser windows. See the workspace documentation for more details. (#4502, #4708, #4088, #4041 #3673, #4780)

Keyboard shortcuts

  • “Save As…” given the keyboard shortcut Ctrl/Cmd Shift S. (#4560)
  • “Run All Cells” given the keyboard shortcut Ctrl/Cmd Shift Enter. (#4558)
  • “notebook:change-to-cell-heading-X” keyboard shortcuts (and commands) renamed to “notebook:change-cell-to-heading-X” for X=1…6. This fixes the notebook command-mode keyboard shortcuts for changing headings. (#4430)
  • The console execute shortcut can now be set to either Enter or Shift Enter as a Console setting. (#4054)

Command palette items

  • “Notebook” added to the command palette to open a new notebook. (#4812)

  • “Run Selected Text or Current Line in Console” added to the command palette to run the selected text or current line from a notebook in a console. A default keyboard shortcut for this command is not yet provided, but can be added by users with the notebook:run-in-console command. To add a keyboard shortcut Ctrl G for this command, use the “Settings” | “Advanced Settings Editor” menu item to open the “Keyboard Shortcuts” advanced settings, and add the following JSON in the shortcut JSON object in the User Overrides pane (adjust the actual keyboard shortcut if you wish). (#3453, #4206, #4330)

      "command": "notebook:run-in-console",
      "keys": ["Ctrl G"],
      "selector": ".jp-Notebook.jp-mod-editMode"
  • The command palette now renders labels, toggled state, and keyboard shortcuts in a more consistent and correct way. (#4533, #4510)


  • “fontFamily”, “fontSize”, and “lineHeight” settings added to the text editor advanced settings. (#4673)
  • Solarized dark and light text editor themes from CodeMirror. (#4445)

Larger file uploads

  • Support for larger file uploads (>15MB) when using Jupyter notebook server version >= 5.1. (#4224)

Extension management and installation

  • New extension manager for installing JupyterLab extensions from npm within the JupyterLab UI. You can enable this from the Advanced Settings interface. (#4682, #4925)
  • Please note that to install extensions in JupyterLab, you must use NodeJS version 9 or earlier (i.e., not NodeJS version 10). We will upgrade yarn, with NodeJS version 10 support, when a bug in yarn is fixed. (#4804)

Interface changes

  • Wider tabs in the main working area to show longer filenames. (#4801)
  • Initial kernel selection for a notebook or console can no longer be canceled: the user must select a kernel. (#4596)
  • Consoles now do not display output from other clients by default. A new “Show All Kernel Activity” console context menu item has been added to show all activity from a kernel in the console. (#4503)
  • The favicon now shows the busy status of the kernels in JupyterLab. (#4361, #3957, #4966)


  • JupyterLab now ships with a Vega4 renderer by default (upgraded from Vega3). (#4806)
  • The HTML sanitizer now allows some extra tags in rendered HTML, including kbd, sup, and sub. (#4618)
  • JupyterLab now recognizes the .tsv file extension as tab-separated files. (#4684)
  • Javascript execution in notebook cells has been re-enabled. (#4515)

Changes for developers

  • A new signal for observing application dirty status state changes. (#4840)
  • A new signal for observing notebook cell execution. (#4740, #4744)
  • A new anyMessage signal for observing any message a kernel sends or receives. (#4437)
  • A generic way for different widgets to register a “Save with extras” command that appears in the File menu under save. (#3981)
  • A new API for removing groups from a JupyterLab menu. addGroup now returns an IDisposable which can be used to remove the group. removeGroup has been removed. (#4890)
  • The Launcher now uses commands from the application CommandRegistry to launch new activities. Extension authors that add items to the launcher will need to update them to use commands. (#4757)
  • There is now a top-level addToBottomArea function in the application, allowing extension authors to add bottom panel items like status bars. (#4752)
  • Rendermime extensions can now indicate that they are the default rendered widget factory for a file-type. For instance, the default widget for a markdown file is a text editor, but the default rendered widget is the markdown viewer. (#4692)
  • Add new workspace REST endpoints to jupyterlab_server and make them available in @jupyterlab/services. (#4841)
  • Documents created with a mimerenderer extension can now be accessed using an IInstanceTracker which tracks them. Include the token IMimeDocumentTracker in your plugin to access this. The IInstanceTracker interface has also gained convenience functions find and filter to simplify iterating over instances. (#4762)
  • RenderMime render errors are now displayed to the user. (#4465)
  • getNotebookVersion is added to the PageConfig object. (#4224)
  • The session kernelChanged signal now contains both the old kernel and the new kernel to make it easy to unregister things from the old kernel. (#4834)
  • The connectTo functions for connecting to kernels and sessions are now synchronous (returning a connection immediately rather than a promise). The DefaultSession clone and update methods are also synchronous now. (#4725)
  • Kernel message processing is now asynchronous, which guarantees the order of processing even if a handler is asynchronous. If a kernel message handler returns a promise, kernel message processing is paused until the promise resolves. The kernel’s anyMessage signal is emitted synchronously when a message is received before asynchronous message handling, and the iopubMessage and unhandledMessage signals are emitted during asynchronous message handling. These changes mean that the comm onMsg and onClose handlers and the kernel future onReply, onIOPub, and onStdin handlers, as well as the comm target and message hook handlers, may be asynchronous and return promises. (#4697)
  • Kernel comm targets and message hooks now are unregistered with removeCommTarget and removeMessageHook, instead of using disposables. The corresponding registerCommTarget and registerMessageHook functions now return nothing. (#4697)
  • The kernel connectToComm function is synchronous, and now returns the comm rather than a promise to the comm. (#4697)
  • The KernelFutureHandler class expectShell constructor argument is renamed to expectReply. (#4697)
  • The kernel future done returned promise now resolves to undefined if there is no reply message. (#4697)
  • The IDisplayDataMsg is updated to have the optional transient key, and a new IUpdateDisplayDataMsg type was added for update display messages. (#4697)
  • The uuid function from @jupyterlab/coreutils is removed. Instead import UUID from @phosphor/coreutils and use UUID.uuid4() . (#4604)
  • Main area widgets like the launcher and console inherit from a common MainAreaWidget class which provides a content area (.content) and a toolbar (.toolbar), consistent focus handling and activation behavior, and a spinner displayed until the given reveal promise is resolved. Document widgets, like the notebook and text editor and other documents opened from the document manager, implement the IDocumentWidget interface (instead of DocumentRegistry.IReadyWidget), which builds on MainAreaWidget and adds a .context attribute for the document context and makes dirty handling consistent. Extension authors may consider inheriting from the MainAreaWidget or DocumentWidget class for consistency. Several effects from these changes are noted below. (#3499, #4453)
    • The notebook panel .notebook attribute is renamed to .content.
    • The text editor is now the .content of a DocumentWidget, so the top-level editor widget has a toolbar and the editor itself is widget.content.editor rather than just widget.editor.
    • Mime documents use a MimeContent widget embedded inside of a DocumentWidget now.
    • Main area widgets and document widgets now have a revealed promise which resolves when the widget has been revealed (i.e., the spinner has been removed). This should be used instead of the ready promise.

Changes in the JupyterLab code infrastructure include:

  • The JupyterLab TypeScript codebase is now compiled to ES2015 (ES6) using TypeScript 2.9. We also turned on the TypeScript esModuleInterop flag to enable more natural imports from non-es2015 JavaScript modules. With the update to ES2015 output, code generated from async/await syntax became much more manageable, so we have started to use async/await liberally throughout the codebase, especially in tests. Because we use Typedoc for API documentation, we still use syntax compatible with TypeScript 2.7 where Typedoc is used. Extension authors may have some minor compatibility updates to make. If you are writing an extension in TypeScript, we recommend updating to TypeScript 2.9 and targeting ES2015 output as well. (#4462, #4675, #4714, #4797)
  • The JupyterLab codebase is now formatted using Prettier. By default the development environment installs a pre-commit hook that formats your staged changes. (#4090)
  • Updated build infrastructure using webpack 4 and better typing. (#4702, #4698)
  • Upgraded yarn to version 1.6. Please note that you must use NodeJS version 9 or earlier with JupyterLab (i.e., not NodeJS version 10). We will upgrade yarn, with NodeJS version 10 support, when a bug in yarn is fixed. (#4804)
  • Various process utilities were moved to jupyterlab_server. (#4696)

Other fixes

  • Fixed a rendering bug with the Launcher in single-document mode. (#4805)
  • Fixed a bug where the native context menu could not be triggered in a notebook cell in Chrome. (#4720)
  • Fixed a bug where the cursor would not show up in the dark theme. (#4699)
  • Fixed a bug preventing relative links from working correctly in alternate IDrives. (#4613)
  • Fixed a bug breaking the image viewer upon saving the image. (#4602)
  • Fixed the font size for code blocks in notebook Markdown headers. (#4617)
  • Prevented a memory leak when repeatedly rendering a Vega chart. (#4904)
  • Support dropped terminal connection re-connecting. (#4763, #4802)
  • Use require.ensure in vega4-extension to lazily load vega-embed and its dependencies on first render. (#4706)
  • Relative links to documents that include anchor tags will now correctly scroll the document to the right place. (#4692)
  • Fix default settings JSON in setting editor. (#4591, #4595)
  • Fix setting editor pane layout’s stretch factor. (#2971, #4772)
  • Programmatically set settings are now output with nicer formatting. (#4870)
  • Fixed a bug in displaying one-line CSV files. (#4795, #4796)
  • Fixed a bug where JSON arrays in rich outputs were collapsed into strings. (#4480)

Beta 2 (v0.32.0)

Apr 16, 2018

This is the second in the JupyterLab Beta series of releases. It contains many enhancements, bugfixes, and refinements, including:

  • Better handling of a corrupted or invalid state database. (#3619, #3622, #3687, #4114).
  • Fixing file dirty status indicator. (#3652).
  • New option for whether to autosave documents. (#3734).
  • More commands in the notebook context menu. (#3770, #3909)
  • Defensively checking for completion metadata from kernels. (#3888)
  • New “Shutdown all” button in the Running panel. (#3764)
  • Performance improvements wherein non-focused documents poll the server less. (#3931)
  • Changing the keyboard shortcut for singled-document-mode to something less easy to trigger. (#3889)
  • Performance improvements for rendering text streams, especially around progress bars. (#4045).
  • Canceling a “Restart Kernel” now functions correctly. (#3703).
  • Defer loading file contents until after the application has been restored. (#4087).
  • Ability to rotate, flip, and invert images in the image viewer. (#4000)
  • Major performance improvements for large CSV viewing. (#3997).
  • Always show the context menu in the file browser, even for an empty directory. (#4264).
  • Handle asynchronous comm messages in the services library more correctly (Note: this means @jupyterlab/services is now at version 2.0!) ([#4115](https://github.com/jupyterlab/jupyterlab/issues/4115)).
  • Display the kernel banner in the console when a kernel is restarted to mark the restart ([#3663](https://github.com/jupyterlab/jupyterlab/issues/3663)).
  • Many tweaks to the UI, as well as better error handling.


Dec 05, 2017


Nov 17, 2017

Bug fix for file browser right click handling. https://github.com/jupyterlab/jupyterlab/issues/3019


Nov 09, 2017

  • Create new view of cell in cell context menu. #3159
  • New Renderers for VDOM and JSON mime types and files. #3157
  • Switch to React for our VDOM implementation. Affects the VDomRenderer class. #3133
  • Standalone Cell Example. #3155


Oct 16, 2017

This release generally focuses on developer and extension author enhancements and general bug fixes.

  • Plugin id and schema file conventions change. https://github.com/jupyterlab/jupyterlab/pull/2936.
  • Theme authoring conventions change. #3061
  • Enhancements to enabling and disabling of extensions. #3078
  • Mime extensions API change (name -> id and new naming convention). #3078
  • Added a jupyter lab --watch mode for extension authors. #3077
  • New comprehensive extension authoring tutorial. #2921
  • Added the ability to use an alternate LaTeX renderer. #2974
  • Numerous bug fixes and style enhancements.


Aug 23, 2017


Jul 21, 2017


Jul 07, 2017


Jun 16, 2017

  • Overhaul of the launcher. #2380
  • Initial implementation of client-side settings system. #2157
  • Updatable outputs. #2439
  • Use new Phosphor Datagrid for CSV viewer. #2433
  • Added ability to enable/disable extensions without rebuilding. #2409
  • Added language and tab settings for the file viewer. #2406
  • Improvements to real time collaboration experience. #2387 #2333
  • Compatibility checking for extensions. #2410
  • Numerous bug fixes and style improvements.


Jun 02, 2017


May 18, 2017


Apr 21, 2017

Release Notes:

Numerous bug fixes and improvements.


Apr 04, 2017

Mainly backend-focused release with compatibility with Phosphor 1.0 and a big refactor of session handling (the ClientSession class) that provides a simpler object for classes like notebooks, consoles, inspectors, etc. to use to communicate with the API. Also includes improvements to the development workflow of JupyterLab itself after the big split.

https://github.com/jupyterlab/jupyterlab/pull/1984 https://github.com/jupyterlab/jupyterlab/pull/1927


Mar 21, 2017


Mar 01, 2017


Feb 09, 2017

  • Adds a Cell Tools sidebar that allows you to edit notebook cell metadata. #1586.
  • Adds keyboard shortcuts to switch between tabs (Cmd/Ctrl LeftArrow and Cmd/Ctrl RightArrow). #1647
  • Upgrades to xterm.js 2.3. #1664
  • Fixes a bug in application config, but lab extensions will need to be re-enabled. #1607
  • Numerous other bug fixes and style improvements.