Use hx --health to check the status of any of the language servers that are configured by default or in your personal languages.toml file. See the documentation for more information about where these files are and how they work.

For Helix to use a language server, it must first be installed onto your computer. If it is one of the default language servers, it will be used automatically with no further setup needed once it is installed.

You can see the configuration of the default language servers for each language in the helix repo languages.toml file. By adding the configurations below, you can supplement or replace the default configurations.

Check if your operating system repository has them available, or install them manually, following the instructions below.

If your language server does not support stdio, you can use netcat as a drop-in proxy, just add this to your languages.toml:

[language-server.example-language-server]
command = "nc" 
args = ["127.0.0.1", "6008"]

[[language]]
name = "example-language"
language-servers = [ "example-language-server" ]

Much of this information was originally sourced from nvim-lspconfig, thanks to those authors!

If your OS package manager hasn't packaged ansible-language-server, you can install it from NPM:

npm i -g @ansible/ansible-language-server

In turn, this binary will check if ansible-lint and yamllint are installed on your system and use them if found.

In addition to highlighting and linting your code, the Ansible language server can also be used to look up docs for Ansible keywords. With your cursor on a keyword, use "<space>k".

https://github.com/withastro/language-tools/tree/main/packages/language-server

npm i -g @astrojs/language-server

Sample settings in languages.toml

[language-server.astro-ls]
command = "astro-ls"
args = ["--stdio"]
config = {typescript = {tsdk = "/Users/user/.bun/install/global/node_modules/typescript/lib"}, environment = "node"}

[[language]]
name = "astro"
auto-format = true
language-servers = [ "astro-ls" ]

Please note that a valid config.typescript.tsdk path must be passed to the LSP config. You will need typescript installed. If you have typescript installed globally you can find where by running npm list -g | head -1.

https://github.com/Beaglefoot/awk-language-server

npm i -g "awk-language-server@>=0.5.2"

Language server for Bash, written using tree-sitter in TypeScript.

https://github.com/mads-hartmann/bash-language-server

bash-language-server can be installed via NPM:

npm i -g bash-language-server

https://github.com/vito/bass/releases/latest

Bass's language server is built in to the bass command as bass --lsp. See the Guide for more info.

https://github.com/Azure/bicep/releases/latest

The Bicep language server is published separately as a Windows package. Download the bicep-langserver.zip from the releases page.

To run this under Linux/WSL you will need to install the dotnet runtime for your OS.

Unzip this in a directory of your choosing for example, /home/myUser/.cache/. Create the following bash script somewhere in your $PATH:

/usr/local/bin/bicep-langserver

#!/usr/bin/env bash

exec dotnet /home/myUser/.cache/bicep-langserver/Bicep.LangServer.dll

bqnlsp: https://git.sr.ht/~detegr/bqnlsp, which depends on:

cbqn-sys and cbqn-rs

Sample settings in languages.toml

[language-server.bqnlsp]
command = "bqnlsp"

[[language]]
name = "bqn"
file-types = ["bqn"]
comment-token = "#"
indent = { tab-width = 2, unit = "  " }
shebangs = ["bqn", "cbqn"]
roots = []
injection-regex = "bqn"
scope = "scope.bqn"
language-servers = ["bqnlsp"]
language-id = "bqn"

Note: you can input the glyphs by key remapping in config.toml like:

[keys.insert."\\"]
"=" = [ ":insert-output /bin/echo -n ×", "move_char_right" ]
minus = [ ":insert-output /bin/echo -n ÷", "move_char_right" ]
"+" = [ ":insert-output /bin/echo -n ⋆", "move_char_right" ]
# ...

https://clangd.llvm.org/installation.html

NOTE: Clang >= 9 is recommended!

clangd relies on a JSON compilation database specified as compile_commands.json or, for simpler projects, a compile_flags.txt. For details on how to automatically generate one using CMake look here. Alternatively, you can use Bear.

Please go to the installation page. https://clojure-lsp.io/installation/

An example for MacOs/Linux (copied from the installation page)

brew remove clojure-lsp # if you have old clojure-lsp installed via brew
brew install clojure-lsp/brew/clojure-lsp-native

CMake LSP Implementation.

https://github.com/regen100/cmake-language-server

Core languages.toml contains configuration options, view at the top level of this repo.
Install the unofficial LSP server Crystalline. Below is copied from the LSP repo.

wget https://github.com/elbywan/crystalline/releases/latest/download/crystalline_x86_64-unknown-linux-musl.gz -O crystalline.gz &&\
gzip -d crystalline.gz &&\
chmod u+x crystalline

yay -S crystalline

Install using homebrew:

brew install crystalline

https://github.com/hrsh7th/vscode-langservers-extracted

vscode-css-language-server can be installed via npm:

npm i -g vscode-langservers-extracted

https://github.com/omnisharp/omnisharp-roslyn OmniSharp server based on Roslyn workspaces

omnisharp-roslyn can be installed by downloading and extracting a release for your platform from here. Omnisharp can also be built from source by following the instructions here.

Omnisharp requires the dotnet-sdk to be installed.

To use Omnisharp, you only need to have the OmniSharp binary in your environment path. The default languages.toml configuration should work fine.

Download the -netX.0 build. Because OmniSharp is not shipped as a binary file, instead as OmniSharp.dll, it needs to be run using dotnet. As such the languages.toml config should be changed to this:

[language-server.omnisharp]
command = "dotnet"
args = [ "path/to/OmniSharp.dll", "--languageserver" ]

If the language server immediately exits or otherwise doesn't appear to work, try running dotnet restore and/or dotnet build in the current project directory.

Serve-D.

https://github.com/Pure-D/serve-d

Install using dub fetch serve-d

Language server for dart.

https://github.com/dart-lang/sdk/tree/master/pkg/analysis_server/tool/lsp_spec

Install Deno from https://docs.deno.com/runtime/getting_started/installation/

Deno requires custom configuration in languages.toml see https://github.com/denoland/deno/issues/14455

[[language]]
name = "javascript"
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["js"]
language-servers = ["deno-lsp"]
auto-format = true
[[language]]
name = "typescript"
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["ts"]
language-servers = ["deno-lsp"]
auto-format = true
[[language]]
name = "jsx"
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["jsx"]
language-servers = ["deno-lsp"]
auto-format = true
[[language]]
name = "tsx"
shebangs = ["deno"]
roots = ["deno.json", "deno.jsonc"]
file-types = ["tsx"]
language-servers = ["deno-lsp"]
auto-format = true



[language-server.deno-lsp]
command = "deno"
args = ["lsp"]
environment = { NO_COLOR = "1" }

[language-server.deno-lsp.config.deno]
enable = true
# Uncomment to enable completion of unstable features of Deno
# unstable = true
# Uncomment to cache dependencies on save
# cacheOnSave = true
# Enable completion of importing from registries
# Enable completion of function calls
suggest = { completeFunctionCalls = false, imports = { hosts = { "https://deno.land" = true } } }
# suggest = { imports = { hosts = { "https://deno.land" = true, "https://crux.land" = true, "https://x.nest.land" = true } } }
# Uncomment to enable inlay hints
# inlayHints.parameterNames.enabled = "all"
# inlayHints.parameterTypes.enabled = true
# inlayHints.variableTypes.enabled = true
# inlayHints.propertyDeclarationTypes.enabled  = true
# inlayHints.functionLikeReturnTypes.enabled = true
# inlayHints.enumMemberValues.enabled = true

Note that some lsp commands are not currently supported, in particular go_to_definition because it requires a Deno lsp extension https://deno.land/manual/language_server/overview.

https://github.com/rcjsuen/dockerfile-language-server-nodejs

docker-langserver can be installed via npm:

npm install -g dockerfile-language-server-nodejs

https://github.com/microsoft/compose-language-service

docker-compose-langserver can be installed via npm:

npm install -g @microsoft/compose-language-service

https://github.com/nikeee/dot-language-server

npm i -g dot-language-server

https://github.com/elixir-lsp/elixir-ls

elixir-ls can be installed by following the instructions here.

curl -fLO https://github.com/elixir-lsp/elixir-ls/releases/latest/download/elixir-ls.zip
unzip elixir-ls.zip -d /path/to/elixir-ls
# Unix
chmod +x /path/to/elixir-ls/language_server.sh

Rename language_server.sh to elixir-ls and add it to your $PATH as this is how helix expects to find it.

Install using homebrew:

brew install elixir-ls

https://github.com/elm-tooling/elm-language-server#installation

npm install -g elm elm-test elm-format @elm-tooling/elm-language-server

https://github.com/alexanderbrevig/forth-lsp#install

cargo install forth-lsp

https://github.com/fsharp/FsAutoComplete

dotnet tool install --global fsautocomplete

We need to install nc or netcat. Port 6005 is used in Godot 4.0 beta6. You will find the right value in the editor configuration panel.

[language-server.godot]
command = "nc" 
args = [ "127.0.0.1", "6005"]

[[language]]
name = "gdscript"
language-servers = [ "godot" ]

For Windows 10/11

Use winget to install nmap. This will install ncat.

winget install nmap

Once installed, make sure the folder that nmap is now located at is added to your PATH, as winget fails to do this automatically for some people.

In Godot 3.5.1 port used is 6008. You have to change the command used also. Instead of nc type ncat and modify the port. You can find the port when you open the Godot editor and navigate here: Editor -> Editor Settings -> Network -> Language Server -> Remote Port.

[language-server.godot]
command = "ncat" 
args = [ "127.0.0.1", "6008"]

[[language]]
name = "gdscript"
language-servers = [ "godot" ]

Starting with version 0.21.0, the Gleam language server is built-in to the gleam command-line interface. See the official announcement for more information.

gleam lsp

The folder for go packages (typically $HOME/go/bin) will need to be added to your PATH for any of the below to work.

go install golang.org/x/tools/gopls@latest                            # LSP
go install github.com/go-delve/delve/cmd/dlv@latest                   # Debugger
go install golang.org/x/tools/cmd/goimports@latest                    # Formatter
go install github.com/nametake/golangci-lint-langserver@latest        # Linter
go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest # Linter cli

The LSP formatter (gofmt) does not fix imports, goimports should be used instead.

languages.toml

[[language]]
name = "go"
auto-format = true
formatter = { command = "goimports" }

https://github.com/graphql/graphiql/blob/main/packages/graphql-language-service-cli/

npm i -g graphql-language-service-cli

Haskell Language Server.

https://github.com/haskell/haskell-language-server

The Helm-ls installation guide can be found under the "Getting Started" section in the readme.

https://github.com/mrjosh/helm-ls#getting-started

https://github.com/hrsh7th/vscode-langservers-extracted

vscode-html-language-server can be installed via npm:

npm i -g vscode-langservers-extracted

https://github.com/kristoff-it/superhtml

https://github.com/eclipse/eclipse.jdt.ls

Installation instructions can be found on the projects README.

On macOS installation can also be done via brew install jdtls.

On debian based distros try a fantastic install script made by eruizc-dev: jdtls-launcher.

For the Arch Linux: yay -Sy jdtls AUR jdtls source.

After installing, test to see if the jdtls works out of the box (it should work for the debian script). For versions older than 1.16.0: the -data parameter must be passed to jdtls and it must be different for each project. This can be achieved by adding a .helix/languages.toml configuration to the project root:

[language-server]
jdtls = { command = "jdtls" }
language-server = { command = "jdtls", args = [
  "-data", "/home/<USER>/.cache/jdtls/workspace"
  ]}

[[language]]
name = "java"
scope = "source.java"
injection-regex = "java"
file-types = ["java"]
roots = ["pom.xml", "build.gradle", ]
indent = { tab-width = 4, unit = "    " }
language-servers = [ "jdtls" ]

Note: the -data parameter must be up one directory from the project directory.

See tsserver.

https://github.com/hrsh7th/vscode-langservers-extracted

vscode-json-language-server, a language server for JSON and JSON schema

vscode-json-language-server can be installed via npm:

npm i -g vscode-langservers-extracted

Available settings can be found here: https://github.com/microsoft/vscode/blob/4f69cdf95a12cef48d405b38bf7812a7f297c310/extensions/json-language-features/server/src/jsonServer.ts#L183

Usage

config = { "provideFormatter" = true, "json" = { "keepLines" = { "enable" = true } } }

https://github.com/grafana/jsonnet-language-server

A Language Server Protocol (LSP) server for Jsonnet.

Can be installed either via the latest release binary or if you have golang installed, you can use:

go install github.com/grafana/jsonnet-language-server@latest

https://github.com/julia-vscode/LanguageServer.jl

LanguageServer.jl can be installed with julia and Pkg:

julia -e 'using Pkg; Pkg.add("LanguageServer")'

To update an existing install, use the following command:

julia -e 'using Pkg; Pkg.update()'

A Kotlin language server which was developed for internal usage and released afterward. Maintaining is not done by the original author, but by fwcd.

It is built via gradle and developed on GitHub. Source and additional description: https://github.com/fwcd/kotlin-language-server

TexLab: A cross-platform implementation of the Language Server Protocol providing rich cross-editing support for the LaTeX typesetting system.

Add the following to your languages.toml to enable build on save:

[language-server.texlab.config.texlab.build]
onSave = true

TexLab can be further configured to jump to your current location in the pdf following the build, among other useful things. For all available options, see the TexLab wiki. Everything under the texlab key goes under language-server.texlab.config.texlab (or possibly language.config.texlab on older releases). For instance, setting the texlab.build.onSave property to true (as per the TexLab wiki) is achieved with the above languages.toml.

https://github.com/leanprover/lean-client-js/tree/master/lean-language-server

Lean installation instructions can be found here.

Once Lean is installed, you can install the Lean 3 language server by running

npm install -g lean-language-server

Binaries are available from: https://github.com/LuaLS/lua-language-server/releases

mac

brew install lua-language-server

@markdoc/language-server - an experimental language server for markdoc. markdoc-ls should be available after installation.

Install using

npm install -g @markdoc/language-server

The default language server is Marksman: https://github.com/artempyanykh/marksman

Binaries are available from: https://github.com/artempyanykh/marksman/releases

macOS and Linux

brew install marksman or yay -S marksman-bin

Windows

scoop install marksman

As an alternative you can use ltex-ls which provides grammar and spelling errors in markup documents: https://valentjn.github.io/ltex/

[[language]]
name = "markdown"
language-servers = [ "marksman", "ltex-ls" ]

Additional configuration settings can be added, for example to disable the profanity rules and add the word builtin to two dictionaries:

[language-server.ltex-ls.config]
ltex.disabledRules = { "en-US" = ["PROFANITY"], "en-GB" = ["PROFANITY"] }
ltex.dictionary = { "en-US" = ["builtin"], "en-GB" = ["builtin"] }

Currently, the ability to add to your user dictionary while running Helix is not supported, so adding words to the config is the best workaround.

An alternative to marksman that provides support for advanced markdown PKM systems in your favorite text editor. It features complete compatibility with Obsidian.md markdown syntax and bases its features on the features of the Obsidian.md editor. For a list of all features, check out the README

• It can be installed for Arch from the AUR under the name markdown-oxide-git

paru -S markdown-oxide-git

• Or it can be installed by cargo

cargo install --git https://github.com/Feel-ix-343/markdown-oxide.git markdown-oxide

• Or manually by following these directions

matlab-language-server

Note: as per the README, "MATLAB language server requires MATLAB version R2021a or later."

[language-server.matlab-ls]
command = "matlab-language-server"
args = ["--stdio"]

[language-server.matlab-ls.config.MATLAB]
indexWorkspace = false
installPath = "/PATH/TO/MATLAB/INSTALLATION"
matlabConnectionTiming = "onStart"
telemetry = false

[[language]]
name = "matlab"
scope = "source.m"
file-types = ["m"]
language-servers = ["matlab-ls"]
comment-token = "%"
shebangs = ["octave-cli", "matlab"]
indent = { tab-width = 2, unit = "  " }

https://www.mint-lang.com

Install Mint using the instructions. The language server is included since version 0.12.0.

https://www.modular.com/mojo

• Install the Modular CLI
• Install the Mojo SDK

See this PR: https://github.com/helix-editor/helix/pull/8583

https://github.com/nim-lang/langserver

# May require choosenim
nimble install nimlangserver

The default language server is nil since the 2022-12 release.

https://github.com/oxalica/nil

This program is available in NixOS/nixpkgs under attribute nil, and is regularly updated.

• If you use nix-env, run nix-env -iA nixpkgs.nil
• If you use nix profile, run nix profile install nixpkgs#nil
• Check out the GitHub repository for additional options

The formatter nixpkgs-fmt is not included and can be installed with nix-env -iA nixpkgs.nixpkgs-fmt

To set up the formatter, set the following in your languages.toml :

[[language]]
name = "nix"
formatter = { command = "nixpkgs-fmt" }

To use the previous default language server, check out https://github.com/nix-community/rnix-lsp

https://github.com/ocaml/ocaml-lsp

The OCaml language server ocamllsp can be installed via OPAM:

opam install ocaml-lsp-server

ols - https://github.com/DanielGavin/ols

Provides syntax highlighting, auto-complete, code formatting and more for Odin.

An implementation of the language server protocol for OpenPolicyAgent's rego.

You can download it from its releases page, or

$ go install github.com/kitagry/regols@latest

https://github.com/bscan/PerlNavigator

Provides syntax checking, autocompletion, perlcritic, code navigation, hover for Perl.

Implemented as a Language Server using the Microsoft LSP libraries along with Perl doing the syntax checking and parsing.

Perl Navigator can be installed by downloading the latest release for your platform at the project's releases page and putting the perlnavigator executable somewhere in your PATH.

https://github.com/pest-parser/pest-ide-tools

This repository contains an implementation of the Language Server Protocol in Rust, for the Pest parser generator.

https://phpactor.readthedocs.io/en/master/index.html

Phpactor requires PHP 8.1.

You can download phpactor.phar as follows:

curl -Lo phpactor.phar https://github.com/phpactor/phpactor/releases/latest/download/phpactor.phar

Then make it executable and symlink it somewhere in your PATH:

chmod a+x phpactor.phar
mv phpactor.phar ~/.local/bin/phpactor

Check support using the status command:

phpactor status
✔ Composer detected - faster class location and more features!
✔ Git detected - enables faster refactorings in your repository scope!

Then, to enable this LSP you have to create a file languages.toml in your project directory .helix/languages.toml and place the following code inside (or if you want you could do this to helix languages.toml file globally):

[language-server.phpactor]
command = "phpactor"
args = [ "language-server" ]
[[language]]
name = "php"
language-servers = [ "phpactor" ]

https://intelephense.com

intelephense can be installed via npm:

npm install -g intelephense

To enable the premium features you have to provide a license key for which you have a few options:

1. Adding the license key directly to your languages.toml file:

[language-server.intelephense.config]
licenceKey = "MY_LICENSE_KEY"

2. Adding the path to your license file

[language-server.intelephense.config]
licenceKey = "/home/username/.config/intelephense/license.txt"

3. Adding the license file to your home directory under $HOME/intelephense/licence.txt

Note: Keep in mind how the word is written licenceKey and not licenseKey, also for step 3) it has to be licence.txt.

https://github.com/termux/termux-language-server

yay -S termux-language-server

Syntax highlighting is not currently possible as there is no PowerShell treesitter. But auto-completion can be achieved by the following configuration. Download the latest PowerShellEditorServices zip and extract it. In this example, I extracted it to C:\projects\powershell.

[[language]]
name = "powershell"
scope = "source.ps1"
file-types = ["ps1", "psm1"]
roots = [".git"]
comment-token = "#"
indent = { tab-width = 4, unit = "    " }
language-servers = [ "powershell-editor-services" ]

[language-server.powershell-editor-services]
command = "pwsh"
args = ["-NoLogo", "-NoProfile", "-Command", "C:\\projects\\powershell\\PowerShellEditorServices\\PowerShellEditorServices\\Start-EditorServices.ps1 -BundledModulesPath C:\\projects\\
powershell\\PowerShellEditorServices -SessionDetailsPath C:\\projects\\powershell\\PowerShellEditorServices\\PowerShellEditorServices.sessions.json -LogPath C:\\projects\\powershell\\
PowerShellEditorServices\\PowerShellEditorServices.log -FeatureFlags @() -AdditionalModules @() -HostName helix -HostProfileId 0 -HostVersion 1.0.0 -Stdio -LogLevel Normal"]

https://github.com/prisma/language-tools/tree/main/packages/language-server

prisma-language-server can be installed via npm:

npm install -g @prisma/language-server

An implementation of the language server protocol for SWI-Prolog

https://github.com/jamesnvc/lsp_server

Install the swi-prolog package and run swipl:

?- pack_install(lsp_server).

python-lsp/python-lsp-server (pylsp) is a fork of the python-language-server project (pyls), maintained by the Spyder IDE team and the community. It is a Python 3.7+ implementation of the Language Server Protocol (versions <1.4 should still work with Python 3.6).

Installation instructions can be found in the project's README, but it consists of installing a package using pip (or pipx):

pip install -U 'python-lsp-server[all]'

The [all] above refers to the optional providers supported. You can fine-tune what to install following the instructions here.

python-lsp/pylsp-mypy (pylsp-mypy) is a Mypy (type checker) plugin for Pylsp. First do the steps in Pylsp section and then install pylsp-mypy:

pip install pylsp-mypy

languages.toml

[[language]]
name = "python"
language-servers = ["pylsp"]

[language-server.pylsp.config.pylsp]
plugins.pylsp_mypy.enabled = true
plugins.pylsp_mypy.live_mode = true

python-lsp/python-lsp-ruff is a plugin for pylsp that provides support for ruff (see below). See installation instructions.

The plugin supports some configuration, but it should work out of the box after installing.

Pyright is a fast type checker and language server from Microsoft, meant for large Python source bases. It is the LSP part of pylance (the VS Code python daemon).

https://github.com/microsoft/pyright

The language server can be installed by running npm install --location=global pyright

languages.toml

[[language]]
name = "python"
language-servers = [ "pyright" ]

Basedpyright is a fork of pyright with various type checking improvements, improved vscode support and pylance features built into the language server.

https://docs.basedpyright.com

The language server can be installed by running pip install basedpyright

languages.toml

[[language]]
name = "python"
language-servers = [ "basedpyright" ]

charliermarsh/ruff is an extremely fast Python linter, written in Rust (see installation instructions).

An LSP for it is available through ruff-lsp (see installation instructions) or ruff with arg server. Also check out the ruff docs for integration with helix.

A suggested Helix configuration using ruff as lsp is given below:

[language-server.ruff-lsp]
command = "ruff-lsp"
[[language]]
name = "python"
language-servers = [ "ruff-lsp" ]

or

[[language]]
name = "python"
language-servers = [ "ruff" ]
auto-format = true
[language-server.ruff]
command = "ruff"
args = ["server"]

Note that ruff lacks basic features and is meant to be used alongside another LSP (helix-editor/helix#5399 (comment), charliermarsh/ruff-lsp#23, charliermarsh/ruff-lsp#23 (comment)).

As an alternative, pylsp has support for ruff via a plugin. See instructions for Helix here

pyright - npm install pyright -g

ruff-lsp - pip install ruff-lsp or ruff - pip install ruff (ruff-lsp is A Language Server Protocol implementation for ruff, you can choose one)

[[language]]
name = "python"
language-servers = [ "pyright", "ruff" ]

[language-server.pyright.config.python.analysis]
typeCheckingMode = "basic"

# if you choose `ruff-lsp`
[language-server.ruff]
command = "ruff-lsp"
[language-server.ruff.config.settings]
args = ["--ignore", "E501"]
# if you choose `ruff` itself
[language-server.ruff]
command = "ruff"
args = ["server"]

• ruff

• pyright

• pylyzer

# in languages.toml
[[language]]
name = "python"
language-servers = ["pyright", "ruff", "pylyzer"]
[language-server.pyright.config.python.analysis]
typeCheckingMode = "basic"
[language-server.ruff]
command = "ruff"
args = ["server"]
[language-server.pylyzer]
command = "pylyzer"
config = { settings = { args = ["--server"] } }

An implementation of the Language Server Protocol for R.

https://github.com/REditorSupport/languageserver

The language server can be installed by running R -e 'install.packages("languageserver")'.

https://github.com/jeapostrophe/racket-langserver

The Racket language server. This project seeks to use DrRacket's public API to provide functionality that mimics DrRacket's code tools as closely as possible.

Install via raco: raco pkg install racket-langserver

https://github.com/rescript-lang/rescript-vscode

// ReScript language server.

rust-analyzer, a language server for Rust.

You can install rust-analyzer using rustup starting from Rust 1.64, and it will be added to your system's $PATH starting from Rustup 1.26.0:

rustup component add rust-analyzer

Add the following to your languages.toml to enable clippy on save:

[language-server.rust-analyzer.config.check]
command = "clippy"

See docs for extra settings. Everything under the rust-analyzer key goes under language-server.rust-analyzer.config key in helix (for example, rust-analyzer.check.command = "clippy" is translated into the language.toml as above.)

Scala language server with rich IDE features.

https://scalameta.org/metals/

1. Install Coursier
2. Run coursier install metals

Steel's language server is available at github.com/mattwparas/crates/steel-language-server.

Recommended installation for LSP + interpreter (link):

git clone git@github.com:mattwparas/steel.git
cd steel
cargo xtask install

Then follow the configuration instructions.

Finally, add the following to your language configuration file:

[[language]]
name = "scheme"
language-servers = ["steel-language-server"]

[language-server.steel-language-server]
command = "steel-language-server"
args = []

SCSS's language server is available from the vscode-langservers-extracted collection:

https://github.com/hrsh7th/vscode-langservers-extracted

You may install it by running:

npm i -g vscode-langservers-extracted

https://github.com/slint-ui/slint/tree/HEAD/tools/lsp
https://slint-ui.com/

cargo install slint-lsp

For Smithy projects the following LSP is used: https://github.com/awslabs/smithy-language-server

coursier must be installed so that the language server can be launched. To install coursier please see their installation instructions. Since coursier will take care of everything else, no other steps are necessary!

https://solargraph.org/

Solargraph, a language server for Ruby

You can install Solargraph via gem install.

gem install --user-install solargraph

solc is the native language server for the Solidity language.

https://docs.soliditylang.org/en/latest/installing-solidity.html

https://github.com/sveltejs/language-tools/tree/master/packages/language-server

svelte-language-server can be installed via npm:

npm i -g svelte-language-server

For integration with .js and .ts files install typescript-svelte-plugin via npm:

npm i -g typescript-svelte-plugin

Then for each svelte project update your tsconfig.json/jsconfig.json to add the typescript-svelte-plugin

{
    "compilerOptions": {
        ...
        "plugins": [{
            "name": "typescript-svelte-plugin"
        }]
    }
}

Further information on js and ts integration for svelte can be found here.

A language server for Swift, formatting provided via swift-format

https://github.com/apple/sourcekit-lsp

https://github.com/apple/swift-format

Follow the Getting Started guide to get sourcekit-lsp installed correctly for your OS. No additional configuration is needed, though note to use the same toolchain for both your installed LSP, and that you use to build.

https://github.com/joe-re/sql-language-server

npm i -g sql-language-server

languages.toml setting

[language-server.sql-language-server]
command = "sql-language-server"
args = ["up", "--method", "stdio"]

[[language]]
name = "sql"
language-servers = [ "sql-language-server" ]

• Note: There is also https://github.com/sqls-server/sqls written in Go

https://github.com/tailwindlabs/tailwindcss-intellisense

tailwindcss-language-server can be installed via npm:

npm i -g @tailwindcss/language-server

Add this to your local languages.toml file to enable it

languages.toml:

[[language]]
name = "html"
language-servers = [ "vscode-html-language-server", "tailwindcss-ls" ]

[[language]]
name = "css"
language-servers = [ "vscode-css-language-server", "tailwindcss-ls" ]

[[language]]
name = "jsx"
language-servers = [ "typescript-language-server", "tailwindcss-ls" ]

[[language]]
name = "tsx"
language-servers = [ "typescript-language-server", "tailwindcss-ls" ]

[[language]]
name = "svelte"
language-servers = [ "svelteserver", "tailwindcss-ls" ]

If you want to use TailwindCSS language server with other languages, configure like example below. The example is with rust.

[[language]]
name = "rust"
language-servers = ["rust-analyzer", "tailwindcss-ls"]

[language-server.tailwindcss-ls]
config = { userLanguages = { rust = "html", "*.rs" = "html" } }

You'll need terraform-ls installed; the instructions are here.

Add this to your local languages.toml file to enable it

languages.toml:

[[language]]
name = "hcl"
language-servers = [ "terraform-ls" ]
language-id = "terraform"

[[language]]
name = "tfvars"
language-servers = [ "terraform-ls" ]
language-id = "terraform-vars"

[language-server.terraform-ls]
command = "terraform-ls"
args = ["serve"]

https://taplo.tamasfe.dev/

The NPM versions of taplo does not contain the language server at this time The full version (with the language server) can be downloaded from:

binaries: taplo releases

or installed with:

cargo:

cargo install taplo-cli --locked --features lsp

languages.toml:

[[language]]
name = "toml"
formatter = { command = "taplo", args = ["fmt", "-"] }

Run taplo lsp --help for more info.

https://github.com/typescript-language-server/typescript-language-server

typescript-language-server depends on typescript. Both packages can be installed via npm:

npm install -g typescript typescript-language-server

To configure type language server, add a tsconfig.json or jsconfig.json to the root of your project.

Here's an example that disables type checking in JavaScript files.

{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es6",
    "checkJs": false
  },
  "exclude": ["node_modules"]
}

Biome is a fast and efficient toolchain for web development that formats and lints code, supporting JavaScript, TypeScript, JSX, and JSON, with over 190 rules and high compatibility with existing tools like Prettier.

npm install --save-dev --save-exact @biomejs/biome

Follow the official instructions on how to configure Biome for Helix.

1. Install the LSP:

# `npm update -g` will install `@latest`,
# only do that after the issue has been fixed!
npm i -g vscode-langservers-extracted@4.8
# unfortunately, there's no known way to pin/lock
# global packs

2. Add this to your languages.toml:

# You might want to read this:
# https://github.com/helix-editor/helix/discussions/8452

[[language]]
name = "javascript"
language-servers = [
  "typescript-language-server", # optional
  "vscode-eslint-language-server",
]

[[language]]
name = "typescript"
language-servers = [ # order-sensitive!
  "typescript-language-server",
  "vscode-eslint-language-server",
]

3. Install ESL

https://github.com/microsoft/typespec

The language server is installed along with the compiler using npm:

npm install -g @typespec/compiler

https://github.com/uben0/tree-sitter-typst/

cargo install --git https://github.com/nvarner/typst-lsp typst-lsp

• language: https://www.uiua.org
• lsp: https://github.com/uiua-lang/uiua?tab=readme-ov-file#language-server
• tree-sitter: https://github.com/shnarazk/tree-sitter-uiua

[language-server.uiua-lsp]
command = "uiua"
args = ["lsp"]

[[language]]
name = "uiua"
scope = "source.uiua"
injection-regex = "uiua"
file-types = ["ua"]
roots = []
auto-format = true
comment-token = "#"
language-servers = [ "uiua-lsp" ]
indent = { tab-width = 2, unit = "  " }
shebangs = ["uiua"]
auto-pairs = {'(' = ')', '{' = '}', '[' = ']', '"' = '"'}

Unison language server.

More info: https://github.com/unisonweb/unison/blob/trunk/docs/language-server.markdown

Requirements:

• ucm started
• ncat, nc or netcat

To ~/.config/helix/languages.toml append this code:

[language-server.ucm]
command = "ncat"
args = ["localhost", "5757"]

[[language]]
name = "unison"
language-servers = [ "ucm" ]

https://github.com/vlang/v-analyzer

Clone, install and build:

git clone --filter=blob:none --recursive --shallow-submodules https://github.com/vlang/v-analyzer
cd v-analyzer
v build.vsh release

or use the installer, and follow the instructions that it will print: v -e "$(curl -fsSL https://raw.githubusercontent.com/vlang/v-analyzer/main/install.vsh)"

config path:

set the v-analyzer to environment variable:

PATH=your/path/v-analyzer/bin:$PATH

https://github.com/vuejs/language-tools/tree/master/packages/language-server

The Vue language server vue-language-server can be installed via npm:

npm i -g @vue/language-server

To autoformat your .vue files upon save, you can first install prettier via npm:

npm i -g prettier

And then add this to your languages.toml file in your Helix configuration directory:

[[language]]
name = "vue"
auto-format = true
formatter = { command = "prettier", args = ["--parser", "vue"] }
language-servers = ["typescript-language-server"]

[[language-server.typescript-language-server.config.plugins]]
name = "@vue/typescript-plugin"
location = <path to "node_modules/@vue/language-server/">
languages = ["vue"]

https://github.com/wgsl-analyzer/wgsl-analyzer

wgsl_analyzer can be installed via cargo:

cargo install --git https://github.com/wgsl-analyzer/wgsl-analyzer wgsl_analyzer

https://github.com/redhat-developer/vscode-xml

wget https://github.com/redhat-developer/vscode-xml/releases/download/0.27.1/lemminx-linux.zip

1. Download lemminx-linux.zip
2. Extract and copy lemminx-linux binary to location in $PATH
3. Install xmllint via package manger yay, dnf, pacman apt-get etc (rpm: dnf install libxml2)

Configuration:

[[language]]
name = "xml"
file-types = [ "xml", "svg", "xsd", "xslt", "xsl" ]
auto-format = true
formatter = { command = "xmllint", args = ["--format", "-"] }
language-servers = [ "xml" ]

[language-server.xml]
command = "lemminx-linux"

https://github.com/redhat-developer/yaml-language-server

yaml-language-server can be installed via brew on Mac:

brew install yaml-language-server

or via npm:

npm i -g yaml-language-server@next

Example configuration using json schemas.

[language-server.yaml-language-server.config.yaml]
format = { enable = true }
validation = true

[language-server.yaml-language-server.config.yaml.schemas]
"https://json.schemastore.org/github-workflow.json" = ".github/workflows/*.{yml,yaml}"
"https://raw.githubusercontent.com/ansible-community/schemas/main/f/ansible-tasks.json" = "roles/{tasks,handlers}/*.{yml,yaml}"

Zig LSP implementation + Zig Language Server.

https://github.com/zigtools/zls

Non language-specific Language Server Protocols, non-coding LSPs, and others.

Harper is an English grammer and spelling checker for comments and text.
Installing:

cargo install harper-ls --locked

Harper will need to be manually added to each language you'd like check's language server list.
Usage:

[language-server.harper-ls]
command = "harper-ls"
args = ["--stdio"]

Disabling specific linters.

[language-server.harper-ls.config.harper-ls.linters]
spaces = false

Vale is a markup-aware linter for prose built with speed and extensibility in mind.

https://github.com/errata-ai/vale

The Vale Language Server is an implementation of the Language Server Protocol for Vale.

https://github.com/errata-ai/vale-ls

Vale supports linting source code comments in a number of languages

You must install both vale and vale-ls into your $PATH and add it to each language you wish to lint, for example:

Since https://github.com/helix-editor/helix/pull/11636/ you only need to add:

[[language]]
name = "html"
language-servers = [ "vscode-html-language-server", "vale-ls" ]

Before that PR:

languages.toml

[language-server.vale-ls]
command = "vale-ls"

[[language]]
name = "html"
language-servers = [ "vscode-html-language-server", "vale-ls" ]