Language Server Protocol support

Warning

Language Server Protocol (LSP) support for JupyrterLab is an experimental feature. It is based on the jupyterlab-lsp extension. More detailed documentation can be found on their page.

JupyterLab 4.0 ships with components on both backend and frontend to lay the infrastructure for handling and communicating with language servers.

This means that other extensions can be built on top of JupyterLab’s services to provide LSP features for notebooks and files.

The LSP service is disabled by default, it can be enabled by togging the Activate option in the Language Servers section of the setting page.

Requirements

By default JupyterLab does not come with any language servers preinstalled, you need to install the servers by yourself. Supported language servers and the suggested package managers to install them are listed in the tables below:

Notebook-optimized Language Servers

Languages	Implementation	Installation
python	jedi-language-server	pip: pip install -U jedi-language-server conda: conda install -c conda-forge jedi-language-server
python	pylsp	pip: pip install 'python-lsp-server[all]' conda: conda install -c conda-forge python-lsp-server
julia	julia-language-server	julia: using Pkg; Pkg.add("LanguageServer")
r	r-languageserver	cran: install.packages("languageserver") conda: conda install -c conda-forge r-languageserver
robotframework	robotframework_ls	pip: pip install robotframework-lsp conda: conda install -c conda-forge robotframework-lsp

NodeJS-based Language Servers

Languages	Implementation	Installation
bash sh	bash-language-server	npm: npm install --save-dev bash-language-server yarn: yarn add --dev bash-language-server
dockerfile	dockerfile-language-server-nodejs	npm: npm install --save-dev dockerfile-language-server-node yarn: yarn add --dev dockerfile-language-server-node
python	pyright	npm: npm install --save-dev pyright yarn: yarn add --dev pyright
sql	sql-language-server	npm: npm install --save-dev sql-language-server yarn: yarn add --dev sql-language-server
javascript typescript	typescript-language-server	npm: npm install --save-dev typescript-language-server yarn: yarn add --dev typescript-language-server
markdown ipythongfm gfm	unified-language-server	npm: npm install --save-dev unified-language-server yarn: yarn add --dev unified-language-server
css less scss	vscode-css-languageserver-bin	npm: npm install --save-dev vscode-css-languageserver-bin yarn: yarn add --dev vscode-css-languageserver-bin
html	vscode-html-languageserver-bin	npm: npm install --save-dev vscode-html-languageserver-bin yarn: yarn add --dev vscode-html-languageserver-bin
json	vscode-json-languageserver-bin	npm: npm install --save-dev vscode-json-languageserver-bin yarn: yarn add --dev vscode-json-languageserver-bin
yaml	yaml-language-server	npm: npm install --save-dev yaml-language-server yarn: yarn add --dev yaml-language-server

For other community-supported language servers, see the extension documentation.

Settings

The settings for language servers can be found on the settings page of JupyterLab (Settings > Settings Editor > Language Servers).

• Activate: this option allows users to enable or disable the LSP services.

• Language Server: this section allows users to configure the installed language servers.

Language servers setting page.