Top 8 Scala HTTP Server Projects

Http4s

3 2,468 9.5 Scala

A minimal, idiomatic Scala interface for HTTP

Project mention: How to get started? | /r/scala | 2023-06-02

http4s is a Typelevel project, and therefore falls into the "program in Scala as if it were Haskell" category. Many people find this off-putting, but honestly, I think with the resources listed above, this is the option at the best intersection of "mature" and "well-documented" available in Scala. The reason it's off-putting to many people is that Haskell-style pure FP isn't mainstream, so it isn't so much a matter of learning a new technology as it is a matter of learning a new paradigm, which necessarily means surfacing and unlearning things you already know, and perhaps confronting the uncomfortable feeling that things you thought were "fundamental," "have to be that way," aren't, and don't. I personally found this process liberating. But not everyone does.
Akka HTTP

1 1,331 0.0 Scala

The Streaming-first HTTP server/module of Akka

Project mention: Akka-HTTP in android | /r/androiddev | 2023-04-12

Here I've posted my issue https://github.com/akka/akka-http/issues/4248
InfluxDB

www.influxdata.com
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tapir

1 1,255 8.3 Scala

Declarative, type-safe web endpoints library

Project mention: what library/framework should I use for backend development? | /r/scala | 2023-02-21

You're not confined to the usual suggestions below (play, http4s). There's a ton of options. (I wrote test cases using a bunch of different frameworks a few years ago at https://github.com/hohonuuli/msdemos). Having written services using a variety of frameworks in production, I would strongly suggest using one that auto-generates API docs (openapi, swagger) for you. That will save you a huge amount of time later on. For heavier services, like the one at https://fathomnet.org/, I tend to the Java side (Quarkus is my current top choice, but Micronaut and Helidon are both great). For everything else I use Scala. My go-to right now is tapir using a vertx backend. See https://tapir.softwaremill.com/
zio-http

2 706 0.0 Scala

A next-generation Scala framework for building scalable, correct, and efficient HTTP clients and servers

Project mention: Creating a CLI app with scala and Graal VM: should I switch to Rust? | /r/scala | 2023-08-31

For JNI, make sure you have `-H:+JNI` in your native image options. Be aware that Netty is a bit of a monster to include in a native image application (I just recently added it a Netty dependency and it completely broke my project and took a good day to figure out). Mine was through zio-http and I was able to piece together some working options from github issues: https://github.com/zio/zio-http/issues/20.
typed-schema

1 151 10.0 Scala

Typelevel http service definition DSL

Project mention: Companies with interesting Scala projects | /r/scala | 2023-06-02

Tinkoff has a strong Scala FP presense: - https://github.com/tofu-tf/tofu - https://github.com/tofu-tf/derevo - https://github.com/tofu-tf/typed-schema
snunit

1 118 5.5 Scala

Scala Native HTTP server based on NGINX Unit

Project mention: Nginx Unit – Universal web app server | news.ycombinator.com | 2023-09-10
livestub

0 50 6.5 Scala

The HTTP server stub you always wanted!
Onboard AI

getonboard.dev
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omhs

0 8 0.0 Scala

One More Http Server: Routing DSL on Netty.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-09-10.