# eclipse-langium/langium

Next-gen language engineering / DSL framework

Repository: https://github.com/eclipse-langium/langium
Canonical: https://ross.abutalabs.com/products/langium
Homepage: https://langium.org/
Language: TypeScript
License: MIT
License Family: permissive
Topics: language-engineering, language-server-protocol, vscode, typescript, domain-specific-language, dsl
Last push: 2026-09-02T17:32:49+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 79, longevity 100
- inputs: {"age_days": 2018, "days_push": 0, "days_rel": 62, "gap_med": 73, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1031, forks 102 (observed 2026-09-03T02:15:11.509659+00:00)

## What it is
Eclipse Langium is a TypeScript framework for building programming languages and domain-specific languages with built-in Language Server Protocol support. It generates typed ASTs from a grammar declaration language and lets languages run in VS Code, browsers, CLIs, and servers.

## Use cases
- create a domain-specific language for my project
- build a custom programming language in TypeScript
- add language server support for my DSL in VS Code
- write a code generator for a custom config language
- build a low-code platform with its own language
- implement an interpreter or validator for a DSL
- run my language tooling in the browser

## When to choose
- you want to build a DSL or programming language on the TypeScript/Node.js stack
- you need LSP-based IDE support (VS Code, Theia) with minimal effort
- you want a modern successor to Xtext in the web ecosystem
- you need your language tooling to run in browsers, CLIs, or servers

## When to avoid
- you need JVM-based language tooling or Xtext's existing ecosystem
- you only need a simple parser without IDE features - a parser library like Chevrotain alone may suffice
- your tooling must be written in a language other than TypeScript/JavaScript

## Facets
- artifact type: framework
- maturity: active
- function: parser, compiler, interpreter, developer-tools, sdk
- domain: programming-languages, parsers, developer-tools, compilers
- platform: cross-platform, browser
- tags: language-engineering, language-server-protocol, dsl, grammar-language, chevrotain, xtext-successor, vscode-extension, code-generation, low-code, nodejs, typescript, vscode

## Member repositories
- eclipse-langium/langium (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:11.509659+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 2026-08-30T07:07:44.909726+00:00, confidence not recorded.
  - readme: https://github.com/eclipse-langium/langium (fetched 2026-09-03T02:15:11.509659+00:00, sha 2c0bf406eba7)
  - homepage: https://langium.org/ (fetched 2026-08-29T13:07:36.430583+00:00, sha 42fc05c87ab5)
  - site_page: https://langium.org/docs (fetched 2026-08-29T13:07:36.440391+00:00, sha d0582bed8b8e)
  - site_page: https://langium.org/docs/learn/workflow (fetched 2026-08-29T13:07:36.442888+00:00, sha 20b336d43bb4)
  - registry_npm: https://registry.npmjs.org/langium (fetched 2026-08-29T13:07:36.445046+00:00, sha 10ada12e4a51)
- Data as of 2026-08-30T08:39:29.467469+00:00.