Programming language: Java
License: Apache License 2.0
Tags: REST Frameworks    

Crnk alternatives and similar libraries

Based on the "REST Frameworks" category.
Alternatively, view Crnk alternatives based on common mentions on social networks and blogs.

  • Retrofit

    A type-safe HTTP client for Android and the JVM
  • Dropwizard

    A damn simple library for building production-ready RESTful web services.
  • Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
    Promo www.influxdata.com
    InfluxDB Logo
  • Feign

    9.1 9.4 L4 Crnk VS Feign
    Feign makes writing java http clients easier
  • Spark

    9.1 0.0 L3 Crnk VS Spark
    A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin
  • rest.li

    Rest.li is a REST+JSON framework for building robust, scalable service architectures using dynamic discovery and simple asynchronous APIs.
  • RESTEasy

    An Implementation of the Jakarta RESTful Web Services Specification
  • Swagger

    The content of swagger.io
  • Rapidoid

    Rapidoid - Extremely Fast, Simple and Powerful Java Web Framework and HTTP Server!
  • RestExpress

    Minimalist Java framework for rapidly creating scalable, containerless, RESTful microservices. Ship a production-quality, headless, RESTful API in the shortest time possible. Uses Netty for HTTP, Jackson for JSON, Metrics for metrics, properties files for configuration. Sub-projects and plugins enable, NoSQL, Swagger, Auth0, HAL integration, etc.
  • RAML

    6.1 0.0 L5 Crnk VS RAML
    RAML to HTML documentation generator.
  • Microserver

    Microserver is a Java 8 native, zero configuration, standards based, battle hardened library to run Java Rest Microservices via a standard Java main class. Supporting pure Microservice or Micro-monolith styles.
  • Jersey

    Eclipse Jersey Project - Read our Wiki:
  • Restlet Framework

    The first REST API framework for Java
  • Hexagon

    Hexagon is a microservices toolkit written in Kotlin. Its purpose is to ease the building of services (Web applications or APIs) that run inside a cloud platform.
  • RestX

    4.6 8.0 L2 Crnk VS RestX
    RESTX, the lightweight Java REST framework
  • StubbornJava

    Unconventional Java code for building web servers / services without a framework. Think dropwizard but as a seed project instead of a framework. If this project had a theme it would be break the rules but be mindful of your decisions.
  • gemini

    Cloud Native and Low Code Platform to create FullStack web Admin applications in minutes
  • Restler

    Restler is a library that automatically generates a client for a web service at run time, by analyzing the respective annotated Spring controller interface

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crnk.io - Crank up the development of RESTful applications!

<!-- currently broken: https://github.com/badges/shields/issues/658 https://img.shields.io/bintray/v/crnk-project/maven/crnk-core.svg

Maven Central


Build Status Gitter License Coverage Status

Bintray release on jcenter\ Bintray latest in private repository

What is Crnk?

Crnk is an implementation of the JSON API specification and recommendations in Java to facilitate building RESTful applications. It provides many conventions and building blocks that application can benefit from. This includes features such as sorting, filtering, pagination, requesting complex object graphs, sparse field sets, attaching links to data or atomically execute multiple operations. Further integration with frameworks and libraries such as Spring, CDI, JPA, Bean Validation, Dropwizard, Servlet API, Zipkin and and more ensure that JSON API plays well together with the Java ecosystem. Have a look at www.crnk.io and the documentation for more detailed information.

Release notes can be found in http://www.crnk.io/releases/.


Crnk Maven artifacts are available from jcenter/bintray: https://bintray.com/crnk-project.

Note that due to reliability issues of MavenCentral we only rarely publish there.


Crnk requires Java 1.8 or later and an SLF4J setup for logging.


See https://github.com/crnk-project/crnk-example/

Gradle settings.gradle can look like:

gradle.beforeProject { Project project ->
    project.with {
        buildscript {
            repositories {
                // maven { url 'https://dl.bintray.com/crnk-project/mavenLatest/' }
        repositories {
            // maven { url 'https://dl.bintray.com/crnk-project/mavenLatest/' }

and the build.gradle:

dependencies {
    implementation platform('io.crnk:crnk-bom:INSERT_VERSION_HERE')
    annotationProcessor platform('io.crnk:crnk-bom:INSERT_VERSION_HERE')

    annotationProcessor 'io.crnk:crnk-gen-java'

    implementation "io.crnk:crnk-setup-spring-boot2"
    implementation "io.crnk:crnk-data-jpa"
    implementation "io.crnk:crnk-data-facet"
    implementation "io.crnk:crnk-format-plain-json"
    implementation "io.crnk:crnk-validation"
    implementation "io.crnk:crnk-home"
    implementation "io.crnk:crnk-ui"
    implementation "io.crnk:crnk-operations"
    implementation "io.crnk:crnk-security"

and a basic Java example:

@JsonApiResource(type = "vote")
public class Vote {

    private UUID id;

    private int stars;


public class VoteRepository extends ResourceRepositoryBase<Vote, UUID> {

    public Map<UUID, Vote> votes = new ConcurrentHashMap<>();

    public VoteRepository() {

    public ResourceList<Vote> findAll(QuerySpec querySpec) {
        return querySpec.apply(votes.values());

    public <S extends Vote> S save(S entity) {
        votes.put(entity.getId(), entity);
        return null;

    public void delete(UUID id) {

or with JPA:

@JsonApiResource(type = "person")
public class PersonEntity {

    private UUID id;

    private String name;

    private int year;

    @OneToMany(mappedBy = "movie")
    private List<RoleEntity> roles = new ArrayList<>();

    private Integer version;

public class PersonRepository extends JpaEntityRepositoryBase<PersonEntity, UUID> {

    public PersonRepository() {

    public PersonEntity save(PersonEntity entity) {
        // add your save logic here
        return super.save(entity);

    public PersonEntity create(PersonEntity entity) {
        // add your create logic here
        return super.create(entity);

    public void delete(UUID id) {
        // add your save logic here

Crnk integrates well with many frameworks. Have a look at the documentation and carefully choose what you need. Don't hesitate to ask for help and suggest improvements!


Crnk is licensed under the Apache License, Version 2.0. You can grab a copy of the license at http://www.apache.org/licenses/LICENSE-2.0.

Building from Source

Crnk make use of Gradle for its build. To build the complete project run

gradlew clean build

Note as part of the build a local Node installation is downloaded to build the frontend parts (crnk-ui) of the project.




We thank YourKit for supporting open source projects with profiler and monitoring tooling.

*Note that all licence references and agreements mentioned in the Crnk README section above are relevant to that project's source code only.