softwaremill/tapir

Health v2 · maintenance only

Adoption not part of the score

1475 stars · 470 forks observed · 2026-10-19

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

Tapir is a Scala library for describing HTTP APIs declaratively with type-safe endpoint definitions. Endpoints can be exposed as servers, consumed as clients, and automatically documented in OpenAPI, AsyncAPI, and JSON Schema formats.

Use cases

• define type-safe HTTP APIs in Scala
• generate OpenAPI documentation from code
• build REST API servers with Netty, Akka HTTP, http4s, or Play
• generate type-safe HTTP clients from endpoint definitions
• gradually adopt declarative endpoints in existing Scala services
• expose AsyncAPI docs for event-driven endpoints

When to choose

• you write Scala and want compile-time guarantees for API endpoints
• you need self-documenting APIs with OpenAPI/AsyncAPI generation
• you want one endpoint definition shared between server and client code
• you need high-performance Scala HTTP servers

When to avoid

• you are not using Scala or the JVM
• you prefer writing OpenAPI specs by hand or code-generating from specs
• you need a non-HTTP protocol like gRPC or GraphQL

Facets

library · maturity active

api-framework http-server http-client routing serialization documentation api-documentation middleware web-development backend apis developer-tools documentation jvm cross-platform openapi asyncapi type-safe declarative-apis scala akka-http http4s zio sttp self-documenting-apis

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