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The easiest HTTP networking library for Kotlin/Android.

You are looking at the documentation for 2.x.y.. If you are looking for the documentation for 1.x.y, checkout the 1.16.0 README.md


  • [x] HTTP GET/POST/PUT/DELETE/HEAD/PATCH requests in a fluent style interface
  • [x] Asynchronous and blocking requests
  • [x] Download as a file
  • [x] Upload files, Blobs, DataParts as multipart/form-data
  • [x] Cancel asynchronous request
  • [x] Debug logging / convert to cUrl call
  • [x] Deserialization into POJO / POKO
  • [x] Requests as coroutines
  • [x] API Routing


You can download and install Fuel with Maven and Gradle. The core package has the following dependencies:

  • Kotlin - 1.3.0
  • Coroutine - 1.0.0
compile 'com.github.kittinunf.fuel:<package>:<latest-version>'

Each of the extensions / integrations has to be installed separately.

Package Description
fuel Core package
fuel-coroutines KotlinX: Execution with coroutines
fuel-android Android: Automatically invoke handler on Main Thread when using Android Module
fuel-livedata Android Architectures: Responses as LiveData
fuel-rxjava Reactive Programming: Responses as Single (RxJava 2.x)
fuel-reactor Reactive Programming: Responses as Mono (Project Reactor 3.x)
fuel-gson (De)serialization: Gson
fuel-kotlinx-serialization (De)serialization: KotlinX Serialization
fuel-forge Deserialization: Forge
fuel-jackson Deserialization: Jackson
fuel-moshi Deserialization: Moshi

Quick start

Fuel requests can be made on the Fuel namespace object, any FuelManager or using one of the String extension methods. If you specify a callback the call is async, if you don’t it’s blocking.

  .responseString { request, response, result ->
    when (result) {
      is Result.Failure -> {
        val ex = result.getException()
      is Result.Success -> {
        val data = result.get()

// You can also use Fuel.get("https://httpbin.org/get").responseString { ... }
// You can also use FuelManager.instance.get("...").responseString { ... }

Fuel and the extension methods use the FuelManager.instance under the hood. You can use this FuelManager to change the default behaviour of all requests:

FuelManager.instance.basePath = "https://httpbin.org"

  .responseString { request, response, result -> /*...*/ }
// This is a GET request to "https://httpbin.org/get"

Detailed usage

Check each of the packages documentations or the Wiki for more features, usages and examples. Are you looking for basic usage on how to set headers, authentication, request bodies and more? fuel: Basic usage is all you need.

Basic functionality



Other libraries

If you like Fuel, you might also like other libraries of mine;

  • Result - The modelling for success/failure of operations in Kotlin
  • Fuse - A simple generic LRU memory/disk cache for Android written in Kotlin
  • Forge - Functional style JSON parsing written in Kotlin
  • ReactiveAndroid - Reactive events and properties with RxJava for Android SDK


Fuel is brought to you by contributors.


Fuel is released under the MIT license.

compile "com.github.kittinunf.fuel:fuel:1.16.0"

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