Java RESTful API

Open-source Java projects categorized as RESTful API
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Top 18 Java RESTful API Projects

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RESTful API

  1. openapi-generator

    OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

    Project mention: Stop Advertising in Your Commits | news.ycombinator.com | 2026-05-26

    To be fair I've never used Laravel - but I do have a memory of code generators/scaffolders inserting files that made clear they were responsible for work

    /*

    * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).

    * Do not edit the class manually.

    */

  2. Kargo

    Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.

    Kargo logo

  3. sureness

    Dromara Sureness A efficient security framework focus on protection of API.

  4. DeepfakeHTTP

    DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.

  5. Crnk

    JSON API library for Java

  6. spring-boot-data-jpa-mysql

    Spring Boot Rest CRUD API example - Spring Data JPA to interact with MySQL/PostgreSQL database.

  7. vsphere-automation-sdk-java

    Java samples, language bindings, and API reference documentation for vSphere, VMC, and NSX-T using the VMware REST API

  8. proteus

    Proteus is a blazing fast minimalist Java web server framework built atop Undertow. (by noboomu)

  9. AppSignal

    Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.

    AppSignal logo

  10. gemini

    Cloud Native and Low Code Platform to create FullStack web Admin applications in minutes (by gemini-projects)

  11. fili

    Easily make RESTful web services for time series reporting with Big Data analytics engines like Druid and SQL Databases.

  12. swagger-brake

    Swagger contract checker for breaking API changes

  13. spotifyApiSpring

    Spring-boot MVC application consuming Spotify's REST API

  14. swaggerific

    Alternative to postman with graalvm meaning native binary exe(windows) file or executable file for Linux and IOS

  15. treblle-spring

    The official Treblle SDK for Java. Seamlessly integrate Treblle to manage communication with your dashboard, send errors, and secure sensitive data.

  16. contacts-app

    A modular, scalable, and maintainable Spring Boot microservices application demonstrating a HexaLayered Architecture for phone directory management and asynchronous reporting. (by agitrubard)

  17. GrowthDiary

  18. spring-data-rest-example

    Spring Data REST example in Spring Boot - CRUD REST APIs with embedded H2 Database

  19. QuickClinic

    🏥 QuickClinic is a healthcare appointment system built using Spring Boot Microservices Architecture. It features modular services for Patients, Doctors, Appointments, Notifications (via Kafka), and secure Authentication using JWT. Designed for scalability, maintainability, and real-world deployment.

  20. embedqa

    API Testing Platform

    Project mention: Building EmbedQA: An Open Source API Testing Tool with Spring Boot 🚀 | dev.to | 2026-01-12

    EmbedQA GitHub Repository

  21. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
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).

Java RESTful API discussion

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Java RESTful API related posts

  • Speed vs Quality vs Security: Enforcing Microservice Consistency in the AI Era

    2 projects | dev.to | 31 Jan 2026

  • Revolutionize Your API Development: Unleash the True Power of OpenAPI Generator!

    2 projects | dev.to | 26 May 2025

  • New AI tool I tested: Coderabbit and Junie

    1 project | dev.to | 26 Apr 2025

  • Generate JAVA code from OpenAPI specification

    1 project | dev.to | 15 Apr 2025

  • openapi-generator VS lapidary-render - a user suggested alternative

    2 projects | 16 Mar 2025

  • Define, Generate, and Implement: An API-First Approach with OpenAPI Generator and FlightPHP

    1 project | dev.to | 24 Feb 2025

  • OpenAPI Generator: Generate clients, servers from OpenAPI 2.0/3.x documents

    1 project | news.ycombinator.com | 18 Nov 2024
  • A note from our sponsor - SaaSHub
    www.saashub.com | 11 Sep 2026
    SaaSHub helps you find the best software and product alternatives Learn more →

Index

What are some of the best open-source RESTful API projects in Java? This list will help you:

# Project Stars
1 openapi-generator 26,738
2 sureness 878
3 DeepfakeHTTP 525
4 Crnk 291
5 spring-boot-data-jpa-mysql 232
6 vsphere-automation-sdk-java 220
7 proteus 200
8 gemini 184
9 fili 176
10 swagger-brake 65
11 spotifyApiSpring 43
12 swaggerific 34
13 treblle-spring 15
14 contacts-app 12
15 GrowthDiary 4
16 spring-data-rest-example 4
17 QuickClinic 2
18 embedqa 0

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