haskell-servant/servant

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1966 stars · 426 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Servant is a Haskell DSL for describing web APIs at the type level, from which servers, clients, mocks, and documentation can be derived. It lets you define an API once and automatically get type-safe serving, querying, mocking, and documenting of that API.

Use cases

• build a type-safe REST API server in Haskell
• generate API clients from a single API definition
• auto-generate API documentation from code
• mock a web service for testing
• define an API once and derive server and client
• serve a JSON web service with compile-time route checking

When to choose

• you write Haskell and want compile-time guarantees that server and client match the API
• you want to derive documentation, clients, and mocks from one API type
• you value type-level correctness for routing and serialization

When to avoid

• you need a framework in a non-Haskell language
• your team is not comfortable with advanced Haskell type-level programming
• you want a batteries-included framework with built-in ORM and templating

Facets

framework · maturity active

web-framework api-framework http-server http-client routing mock-api api-documentation type-system web-development backend apis developer-tools cli type-level-dsl rest haskell code-generation openapi web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="haskell-servant/servant")