softwaremill/sttp

Health v2 · maintenance only

Adoption not part of the score

1502 stars · 333 forks observed · 2026-08-28

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

sttp is a popular open-source HTTP client library for Scala with a clean, type-safe request description API. It supports synchronous, Future-based, and functional effect system programming styles, and runs on the JVM, Scala.js, and Scala Native.

Use cases

• make http requests from scala
• call apis with automatic serialization
• upload and download files over http
• work with websockets in scala
• send multipart form data
• trace http calls with opentelemetry
• test http client interactions
• use one http client across jvm js and native

When to choose

• you write Scala and want a programmer-friendly, type-safe HTTP client
• you need integration with cats-effect, ZIO, Monix, or other effect systems
• you want pluggable backends (Java HttpClient, Akka/Pekko HTTP, http4s, OkHttp, Armeria)
• you need JSON library integration (circe, uPickle, play-, etc.) and streaming support
• you target multiple platforms: JVM, Scala.js, and Scala Native

When to avoid

• you are not using Scala or the JVM/Scala ecosystem
• you need a full HTTP server, not just a client
• you want a zero-dependency minimal client and prefer raw Java HttpClient directly
• your project is locked into a different HTTP stack with no need for an abstraction layer

Facets

library · maturity active

http-client serialization websocket tracing testing file-upload web-development apis developer-tools jvm cross-platform wasm scala scala-js scala-native cats-effect zio akka-http pekko okhttp uri-interpolation -integration streaming

Member repositories

For agents

markdown · JSON · MCP: product_card(name="softwaremill/sttp")