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title: LSP Mode - Language Server Protocol support for Emacs description: Language Server Protocol support with multiple languages support for Emacs root_file: README.md

Language Server Protocol Support for Emacs

Why?

• :heart: Community Driven
• :gem: Fully featured - supports all features in Language Server Protocol v3.14.
• :rocket: Fast - see performance section.
• :star2: Flexible - choose between full-blown IDE with flashy UI or minimal distraction free.
• :gear: Easy to configure - works out of the box and automatically upgrades if additional packages are present.

Overview

Client for Language Server Protocol (v3.14). lsp-mode aims to provide IDE-like experience by providing optional integration with the most popular Emacs packages like company, flycheck and projectile.

• Non-blocking asynchronous calls
• Real-time Diagnostics/linting via flycheck (recommended) or flymake when Emacs > 26 (requires flymake>=1.0.5)
• Code completion - company-capf / completion-at-point (note that company-lsp is no longer supported).
• Hovers - using lsp-ui
• Code actions - via lsp-execute-code-action, modeline (recommended) or lsp-ui sideline.
• Code outline - using builtin imenu or helm-imenu
• Code navigation - using builtin xref, lsp-treemacs tree views or lsp-ui peek functions.
• Code lens
• Symbol highlights
• Formatting
• Project errors on modeline
• Debugger - dap-mode
• Breadcrumb on headerline
• Helm integration - helm-lsp
• Ivy integration - lsp-ivy
• Consult integration - consult-lsp
• Treemacs integration - lsp-treemacs
• Semantic tokens as defined by LSP 3.17 (compatible language servers include recent development builds of clangd and rust-analyzer)

Presentations/demos

• System Crafters channel Emacs IDE Videos
• skybert's emacsconf presentation (Java)
• thatwist's ScalaUA Conference presentation (Scala)

See also

• lsp-docker - provide docker image with preconfigured language servers with corresponding emacs configuration.
• company-box - company frontend with icons.
• dap-mode - Debugger integration for lsp-mode.
• eglot - A minimal LSP implementation built in to Emacs.
• which-key - Emacs package that displays available keybindings in popup
• projectile - Project Interaction Library for Emacs
• emacs-tree-sitter - Faster, fine-grained code highlighting via tree-sitter.
• gccemacs - modified Emacs capable of compiling and running Emacs Lisp as native code.

Contributions

Contributions are very much welcome!

NOTE Documentation for clients is generated from doc comments in the clients themselves (see lsp-doc.el) and some metadata (see lsp-clients.json) so please submit corrections accordingly.

Support the project

The emacs-lsp organization has more than 20,000 lines of code, to keep all of this working, we need to implement new features and help the community on a lot of issues.

You can help us keep going and improving it by supporting the project

Members

Here is a list of the current lsp-mode members and what they are primarily working on/responsible for.