Purely functional HTTP client
Clone or download
miciek Merge pull request #119 from jcouyang/string-interpo
Add string interpolation support
Latest commit 0585e64 Sep 17, 2018



Typelevel incubator Join the chat at https://gitter.im/pepegar/hammock Build Status codecov Maven Central

Hammock is yet another HTTP client for Scala. It tries to be typeful, purely functional, and work along other technologies that you're already using such as akka-http, circe, or cats.


Add the following to your build.sbt.

// For Scala 2.10, 2.11, or 2.12
libraryDependencies += "com.pepegar" %% "hammock-core" % "0.8.5"

// For ScalaJS
libraryDependencies += "com.pepegar" %%% "hammock-core" % "0.8.5"


  1. It's easy to use, has a high level API
  2. It's typeful, tries to represent effects at type level.
  3. It does not force a specific target context. You can run your computations in any type F[_] that has an instance of cats-effect's Sync[F].
  4. It has good documentation.
  5. It's modular


Module name Description Version
hammock-core the core functionality of hammock, using Apache HTTP commons for HTTP in JVM and XHR in JS 0.8.5
hammock-circe encode and decode HTTP entities with Circe 0.8.5
hammock-akka-http run your HTTP requests with akka-http 0.8.5
hammock-asynchttpclient run your HTTP requests with AsyncHttpClient 0.8.5

How does Hammock look in action?

import cats.effect.IO
import io.circe.generic.auto._
import hammock._
import hammock.marshalling._
import hammock.jvm.Interpreter
import hammock.circe.implicits._

object HttpClient {
  implicit val interpreter = Interpreter[IO]

  val response = Hammock
    .request(Method.GET, uri"https://api.fidesmo.com/apps", Map()) // In the `request` method, you describe your HTTP request

Code of conduct

People are expected to follow the Typelevel Code of Conduct when discussing Hammock on the Github page, Gitter channel, or other venues.