# haskell/haskell-language-server

Official Haskell IDE support via the language server protocol (LSP)

Repository: https://github.com/haskell/haskell-language-server
Canonical: https://ross.abutalabs.com/products/haskell-language-server
Language: Haskell
License: Apache-2.0
License Family: permissive
Topics: lsp-server, haskell-language-server, ide, haskell, cabal, stack, ghc, hacktoberfest
Last push: 2026-08-26T19:03:56+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 57, longevity 100
- inputs: {"age_days": 2412, "days_push": 7, "days_rel": 128, "gap_med": 104.0, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2952, forks 453 (observed 2026-08-28T04:07:32.062662+00:00)

## What it is
The official Haskell language server implementing the Language Server Protocol, providing IDE features like diagnostics, completions, and refactoring for Haskell code. It integrates with any LSP-compatible editor and supports GHC, Cabal, and Stack projects.

## Use cases
- set up Haskell IDE support in VS Code or Neovim
- get completions and type errors for Haskell code
- refactor Haskell projects with an LSP server
- enable go-to-definition and hover types in Haskell
- integrate Haskell tooling with any LSP-compatible editor

## When to choose
- you write Haskell and want IDE features in your editor
- you need an LSP server supporting multiple GHC versions
- you use Cabal or Stack build tooling

## When to avoid
- you work in a language other than Haskell
- you need a standalone IDE rather than an editor plugin backend

## Facets
- artifact type: library
- maturity: active
- function: editor, developer-tools, documentation
- domain: developer-tools, text-editors, programming-languages
- platform: cross-platform, cli
- tags: lsp, haskell, ide-support, language-server, ghc, cabal, stack

## Member repositories
- haskell/haskell-language-server (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:32.062662+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:32:38.596276+00:00, confidence not recorded.
  - readme: https://github.com/haskell/haskell-language-server (fetched 2026-08-28T04:07:32.062662+00:00, sha bfaecd87fe72)
- Data as of 2026-08-30T08:39:29.467469+00:00.