mason-lspconfig bridges mason.nvim with the lspconfig plugin - making it easier to use both plugins together.
:help mason-lspconfig.nvim

• Introduction
• Requirements
• Installation
• Setup
  • Automatic server setup (advanced feature)
• Commands
• Configuration
  • Default configuration
• Available LSP servers

:h mason-lspconfig-introduction

mason-lspconfig.nvim closes some gaps that exist between mason.nvim and lspconfig. Its main responsibilities are to:

• register a setup hook with lspconfig that ensures servers installed with mason.nvim are set up with the necessary configuration
• provide extra convenience APIs such as the :LspInstall command
• allow you to (i) automatically install, and (ii) automatically set up a predefined list of servers
• translate between lspconfig server names and mason.nvim package names (e.g. lua_ls <-> lua-language-server)

It is recommended to use this extension if you use mason.nvim and lspconfig (it's strongly recommended for Windows users).

Note: this plugin uses the lspconfig server names in the APIs it exposes - not mason.nvim package names. See this table for a complete mapping.

:h mason-lspconfig-requirements

• neovim >= 0.7.0
• mason.nvim
• lspconfig

use {
    "williamboman/mason.nvim",
    "williamboman/mason-lspconfig.nvim",
    "neovim/nvim-lspconfig",
}

Plug 'williamboman/mason.nvim'
Plug 'williamboman/mason-lspconfig.nvim'
Plug 'neovim/nvim-lspconfig'

:h mason-lspconfig-quickstart

It's important that you set up the plugins in the following order:

1. mason.nvim
2. mason-lspconfig.nvim
3. Setup servers via lspconfig

Pay extra attention to this if you lazy-load plugins, or somehow "chain" the loading of plugins via your plugin manager.

require("mason").setup()
require("mason-lspconfig").setup()

-- After setting up mason-lspconfig you may set up servers via lspconfig
-- require("lspconfig").lua_ls.setup {}
-- require("lspconfig").rust_analyzer.setup {}
-- ...

Refer to the Configuration section for information about which settings are available.

:h mason-lspconfig-automatic-server-setup

mason-lspconfig provides extra, opt-in, functionality that allows you to automatically set up LSP servers installed via mason.nvim without having to manually add each server setup to your Neovim configuration. Refer to :h mason-lspconfig-automatic-server-setup for more details.

:h mason-lspconfig-commands

• :LspInstall [<server>...] - installs the provided servers
• :LspUninstall <server> ... - uninstalls the provided servers

:h mason-lspconfig-settings

You may optionally configure certain behavior of mason-lspconfig.nvim when calling the .setup() function. Refer to the default configuration for a list of all available settings.

Example:

require("mason-lspconfig").setup {
    ensure_installed = { "lua_ls", "rust_analyzer" },
}

local DEFAULT_SETTINGS = {
    -- A list of servers to automatically install if they're not already installed. Example: { "rust_analyzer@nightly", "lua_ls" }
    -- This setting has no relation with the `automatic_installation` setting.
    ensure_installed = {},

    -- Whether servers that are set up (via lspconfig) should be automatically installed if they're not already installed.
    -- This setting has no relation with the `ensure_installed` setting.
    -- Can either be:
    --   - false: Servers are not automatically installed.
    --   - true: All servers set up via lspconfig are automatically installed.
    --   - { exclude: string[] }: All servers set up via lspconfig, except the ones provided in the list, are automatically installed.
    --       Example: automatic_installation = { exclude = { "rust_analyzer", "solargraph" } }
    automatic_installation = false,
}