finagle/finch

Health v2 · maintenance only

Adoption not part of the score

1594 stars · 218 forks observed · 2026-08-28

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

Finch is a thin, purely functional combinator library for building composable HTTP APIs on top of Twitter's Finagle in Scala. Its core abstraction is Endpoint[A], with modules for JSON codecs (circe, argonaut), streaming (fs2), and testing support.

Use cases

• build REST APIs in Scala on Finagle
• define type-safe HTTP endpoints with combinators
• serve JSON endpoints with automatic circe encoding
• build lightweight microservice HTTP servers on the JVM
• compose endpoint routing declaratively

When to choose

• you have an existing Finagle-based Scala codebase
• you want a minimal, close-to-the-metal functional HTTP layer
• you need fine-grained control over Finagle primitives

When to avoid

• starting a new project - Finch and Finagle are no longer maintained
• you want an actively maintained functional Scala HTTP server (use http4s instead)
• you need non-JVM platforms or non-Scala languages

Facets

library · maturity abandoned

web-framework http-server routing serialization web-development backend apis developer-tools jvm cross-platform finagle scala http-api rest circe combinators functional-programming unmaintained

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