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Top 11 Java Openapi3 Projects
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openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
It would be great if D supported something like OpenAPI generator https://github.com/OpenAPITools/openapi-generator
Maybe it exists and I am just ignorant but it doesn't seem to be in the list of supported languages.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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swagger-core
Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API
To use the Swagger Annotations or Micronaut OpenAPI annotations add them to compile classpath
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One major addition is the capability to generate TypeSpec definitions from intercepted requests. This feature allows developers to quickly create TypeSpec definitions from real traffic, streamlining the API modeling process. It works similarly to generating OpenAPI specifications, enhancing productivity.
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Project mention: Energy-Efficient Schema-Driven Development with Spring WebMVC/WebFlux | dev.to | 2025-04-20
In Spring WebMVC/WebFlux, you can use springdoc-openapi to automatically generate an OpenAPI schema from Spring controller implementations. Having an OpenAPI schema enables automatic generation of HTML documentation and client code, which already provides some value.
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When creating something new, including an API, we often start by copying an example of something we know works. The Petstore sample API from Swagger is a famous example that we might want to use as a starting point, especially if we want to create an OpenAPI specification for our API.
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znai
Build functional, maintainable, beautiful User Guides with markdown and Znai plugins. Instant pages navigation. Local search. Multiple integrations to work with Python, Java, C++, OpenAPI, etc. Transform "getting started" sections into slideshow for your workshops. Manage multiple documentations with self-deployed znai hub.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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spring-boot-freemarker-java-mail-api
POC that sends emails to user on account creation event occurrence: made using java spring boot, apache freemarker, java-mail-API, bootstrap email editor and spring events.
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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 Openapi3 discussion
Java Openapi3 related posts
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Programming in D: Tutorial and Reference
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Energy-Efficient Schema-Driven Development with Spring WebMVC/WebFlux
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ez-api – API development toolkit powered by TypeSpec
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After 3 Years, I Failed. Here's All My Startup's Code
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How to "serve" portfolio for test engineer
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Ask HN: How do you write OpenAPI docs?
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TypeSpec
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A note from our sponsor - InfluxDB
www.influxdata.com | 16 May 2025
Index
What are some of the best open-source Openapi3 projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | openapi-generator | 23,694 |
| 2 | swagger-core | 7,427 |
| 3 | typespec | 5,059 |
| 4 | springdoc-openapi | 3,432 |
| 5 | openapi-diff | 920 |
| 6 | swagger-petstore | 284 |
| 7 | znai | 265 |
| 8 | tcases | 226 |
| 9 | docserver | 5 |
| 10 | spring-boot-freemarker-java-mail-api | 4 |
| 11 | spring-web-flux-todo-app | 3 |
Sponsored
InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com