What is LSP?

The Language Server protocol is used between a tool (the client) and a language smartness provider (the server) to integrate features like auto complete, go to definition, find all references and alike into the tool

official Language Server Protocol specification

The LSP was created by Microsoft to define a common language for programming language analyzers to speak. Today, several companies have come together to support its growth, including Codenvy, Red Hat, and Sourcegraph, and the protocol is becoming supported by a rapidly growing list of editor and language communities. See below for details on and links to current client and server implementations.

Why LSP?

LSP creates the opportunity to reduce the m-times-n complexity problem of providing a high level of support for any programming language in any editor, IDE, or client endpoint to a simpler m-plus-n problem.

For example, instead of the traditional practice of building a Python plugin for VSCode, a Python plugin for Sublime Text, a Python plugin for Vim, a Python plugin for Sourcegraph, and so on, for every language, LSP allows language communities to concentrate their efforts on a single, high performing language server that can provide code completion, hover tooltips, jump-to-definition, find-references, and more, while editor and client communities can concentrate on building a single, high performing, intuitive and idiomatic extension that can communicate with any language server to instantly provide deep language support.

The problem: "The Matrix"

Go Java TypeScript ...

The solution: lang servers and clients


Current implementations

LSP is growing - fast. See tables below for the latest on adoption.

Microsoft currently maintains a parallel list of language server implementations in the core LSP repository. This site is designed to operate alongside Microsoft's list by providing more information about the capabilities of language servers and LSP clients, informing users which features to expect when they download and install a new language server and/or client, and communicating where to open-source contributors where help is needed.


To be included on this list, language servers and clients must:

  1. Be fully open source
  2. Be editor-agnostic for language servers or language-agnostic for clients
  3. Implement at least one of the key methods listed below


Not implemented

Language servers

Language Maintainer       Repository Code completion Hover Jump to def Workspace symbols Find references Stream reference results Diagnostics
C# OmniSharp github.com/OmniSharp/omnisharp-node-client/blob/master/languageserver
C# CXuesong github.com/CXuesong/LanguageServer.NET
CSS/LESS/SASS Microsoft github.com/Microsoft/vscode/tree/master/extensions/css
Go Sourcegraph github.com/sourcegraph/go-langserver
GraphQL Facebook GraphQL github.com/graphql/graphql-language-service
Groovy Palantir github.com/palantir/groovy-language-server
Haxe Dan Korostelev github.com/vshaxe/haxe-languageserver
HTML Microsoft github.com/Microsoft/vscode/tree/master/extensions/html
Java Eclipse Foundation, Red Hat github.com/eclipse/eclipse.jdt.ls
Java georgewfraser github.com/georgewfraser/vscode-javac
JavaScript Sourcegraph github.com/sourcegraph/javascript-typescript-langserver
JSON Microsoft github.com/Microsoft/vscode/tree/master/extensions/json
Julia David Anthoff github.com/JuliaEditorSupport/LanguageServer.jl
O'Caml + ReasonML Darin Morrison github.com/freebroccolo/ocaml-language-server
PHP Felix Becker github.com/felixfbecker/php-language-server
PHP Hvy Industries github.com/HvyIndustries/crane/blob/master/server
Python Sourcegraph https://github.com/sourcegraph/python-langserver
Python Palantir github.com/palantir/python-language-server
Rust Nick Cameron and the Rust community github.com/rust-lang-nursery/rls
Scala Iulian Dragos github.com/dragos/dragos-vscode-scala
Swift Ryan Lovelett github.com/rlovelett/langserver-swift
TypeScript Sourcegraph github.com/sourcegraph/javascript-typescript-langserver
JS + PHP + Python SonarSource github.com/SonarSource/sonarlint-core

Work in Progress
C / C++ LLVM Team clang-tools-extra/trunk/clangd
Crystal Ryan L. Bell and contributors github.com/kofno/scry

LSP clients

Editor/client Maintainer       Repository Code completion Hover Jump to def Find references Symbol search Diagnostics
Eclipse LSP4E Eclipse git.eclipse.org/c/lsp4e/lsp4e.git
Eclipse Che Eclipse, Codenvy github.com/eclipse/che/
VSCode Microsoft github.com/Microsoft/VSCode
neovim Junfeng Li github.com/autozimu/LanguageClient-neovim
Sublime Text 3 Tom van Ommeren github.com/tomv564/LSP

Work in progress
Atom Damien Guard github.com/atom/atom-languageclient
Emacs Corey Richardson github.com/sourcegraph/emacs-lsp
Emacs Vibhav Pant github.com/emacs-lsp/lsp-mode
Sublime Sourcegraph github.com/sourcegraph/sublime-lsp
Vim TJ DeVries github.com/tjdevries/nvim-langserver-shim
Spyder IDE Spyder IDE Dev Team github.com/spyder-ide/spyder

Contact us

Langserver.org is maintained by Sourcegraph.

To suggest additions or to update the status of a project, please file issues or submit PRs on this project at github.com/langserver/langserver.github.io

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