Top 23 Go Openapi3 Projects

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1. oapi-codegen

   1 74 7,293 8.7 Go

   Generate Go client and server boilerplate from OpenAPI 3 specifications

   

   Project mention: ⚙️ Go Tools: Code Generation from OpenAPI Specs in Go with oapi-codegen | dev.to | 2025-05-22

   🔗 GitHub Repository: oapi-codegen

2. InfluxDB

   www.influxdata.com featured

   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.

   

3. huma

   2 12 3,210 9.3 Go

   A modern, simple, fast & flexible micro framework for building HTTP REST/RPC APIs in Go backed by OpenAPI 3 and JSON Schema.

   

   Project mention: Automated Documentation for APIs | dev.to | 2025-04-07

   Solutions to this problem generate API documentation automatically. Libraries such as drf-spectacular use code structure and semantics in back-end frameworks to infer API contracts. API frameworks such as FastAPI and Huma generate OpenAPI specifications as a built-in feature. Tools like mitmproxy2swagger generate documentation from HAR files. Finally, companies such as Akita Software/Postman use network traffic metadata.

4. kin-openapi

   3 6 2,937 7.7 Go

   OpenAPI 3.0 (and Swagger v2) implementation for Go (parsing, converting, validation, and more)

   

5. gnostic

   4 1 2,194 4.4 Go

   A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.

   

6. ogen

   5 11 1,775 9.3 Go

   OpenAPI v3 code generator for go

   

   Project mention: Rails for Everything | news.ycombinator.com | 2025-01-01

   With tools like ogen[1], one can take a single Swagger or OpenAPI doc and generate server code with request/response validation, Prometheus metrics, OpenTelemetry, and more.

   It can also generate clients and webhooks. Authentication is just declaring a SecurityScheme in the OpenAPI documentation then implementing a single function. The rest of the backend is just implementing a single interface. Unlike oapi-codegen, there is no need to tinker with middleware for authentication or logging.

   Pair this with a tool like sqlc[2] and SQLite's `pragma user_version`, and you get type-safe database code and database migrations for free. I will concede that adding SQLite is a manual process, but its just two imports added to main.go.

   Frontend is entirely your choice. Go's standard library provides good enough text templating that I don't miss ERB or Django-style templates. Using embed/fs, one can easily embed a bunch of assets into a single static binary, so deployment can be as simple as `go build` and moving a single binary.

   I actually have a hard time using languages besides Go for developing backends, because the code generation tools eliminate the boilerplate I frequently face in other languages while also avoiding the hundreds of dependencies that Spring Boot or Quarkus need.

   [1] https://ogen.dev/

7. restish

   6 12 1,074 6.4 Go

   Restish is a CLI for interacting with REST-ish HTTP APIs with some nice features built-in

   

   Project mention: Create a Server Driven CLI from your REST API | dev.to | 2025-02-18

   Climate allows the server to influence the CLI behaviour by using OpenAPI's extensions. This is the secret of Climate's dynamism. Influenced by some of the ideas behind restish it uses the following extensions as of now:

8. oasdiff

   7 14 908 8.6 Go

   OpenAPI Diff and Breaking Changes

   

   Project mention: Backward compatibility in NestJS | dev.to | 2025-02-11

   In this article, I will show you how to create an automated OpenAPI schema validation to ensure your API stays backwards compatible. We will use NestJS CLI plugin to generate a schema and oasdiff to validate it.

9. Stream

   getstream.io featured

   Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

   

10. vacuum

    8 4 794 9.2 Go

    vacuum is the worlds fastest OpenAPI 3, OpenAPI 2 / Swagger linter and quality analysis tool. Built in go, it tears through API specs faster than you can think. vacuum is compatible with Spectral rulesets and generates compatible reports.

    

    Project mention: Bringing Feedback Loops to API Development | dev.to | 2024-12-19

    We also love open source tools that help achieve the fast feedback loops in API like Vacuum, RateMyOpenAPI or Mockbin to name a few.

11. stackql

    9 7 782 8.5 Go

    Query, provision and operate Cloud and SaaS resources and APIs using an extensible SQL based framework

    

    Project mention: Introducing StackQL - Manage Your Cloud Services & Interact with APIs using SQL 🧑‍💻🔥 | dev.to | 2025-02-17

    StackQL has been created to help developers standardize their cloud workflows, introducing a unified environment for cloud resources management.

12. apisprout

    10 1 709 0.0 Go

    Lightweight, blazing fast, cross-platform OpenAPI 3 mock server with validation

    

13. libopenapi

    11 1 671 9.5 Go

    libopenapi is a fully featured, high performance OpenAPI 3.1, 3.0 and Swagger parser, library, validator and toolkit for golang applications.

    

14. openapi-mock

    12 2 505 0.0 Go

    OpenAPI mock server with random data generation

    

15. rest

    13 11 464 6.6 Go

    Web services with OpenAPI and JSON Schema done quick in Go (by swaggest)

    

16. openapi-go

    14 2 310 5.4 Go

    OpenAPI structures for Go

    

17. kusk-gateway

    15 12 277 0.0 Go

    Kusk-gateway is an OpenAPI-driven API Gateway for Kubernetes

    

18. apibrew

    16 5 248 5.9 Go

    APIBrew is Low code software to automate building CRUDs from yaml files

    

19. thema

    17 1 233 6.5 Go

    A CUE-based framework for portable, evolvable schema

    

20. fizz

    18 3 225 0.0 Go

    :lemon: Gin wrapper with OpenAPI 3 spec generation

    

21. wiretap

    19 2 182 8.0 Go

    The world's coolest API Validation and compliance tool. Validate APIs against OpenAPI specifications and much more (by pb33f)

    

    Project mention: Mastering API Definitions: A Comprehensive Guide | dev.to | 2024-12-19

    During the API development phase, a detailed definition guides developers in implementing endpoints, methods, and data schemas correctly. Various tooling exists to ensure your code conforms to the agreed upon spec - including API frameworks like Huma which allow you to build APIs around a spec, as well as API contract testing tools like Wiretap which look at live traffic to detect violations.

22. openapi-generator-go

    20 1 111 4.8 Go

    An opinionated OpenAPI v3 code generator for Go. Use this to generate API models and router scaffolding.

    

23. GoAPI

    21 1 85 3.9 Go

    GoAPI - A Fast and Easy-to-use Web Framework for Building APIs in Go

    

24. gleece

    22 3 75 9.3 Go

    Building, documenting, validating, securing and customizing REST APIs through code-first development

    

    Project mention: Show HN: Gleece – Streamlined API development framework for Go | news.ycombinator.com | 2025-04-07

    Thus, inspired by the TSOA project and its flexibility, we created Gleece, an open-source Go framework that simplifies the process of building, documenting, and maintaining RESTful APIs.

    Features include:

    Code-First - Define and document your API endpoints in code, making them easy to maintain and understand.

    Self-Documenting - Automatically generate OpenAPI 3.0/3.1 specifications from your code, ensuring your API is always well-documented and up-to-date.

    Plug & Play - Easy to get started with and "plays nice" with other frameworks, routers, and tools.

    Customizable - A template-centric approach allows for easy yet extensive customization.

    Holistic - Built-in support for authentication, authorization, request/response validation, and error handling to help you create robust APIs.

    IDE Integration - The project includes an optional Visual Studio Code extension to provide developers with quality-of-life features.

    You can check out the project on GitHub: https://github.com/gopher-fleece/gleece

25. rest

    23 1 70 5.5 Go

    Generate OpenAPI 3.0 specifications from Go code. (by a-h)

    

26. SaaSHub

    www.saashub.com featured

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

    

Go Openapi3 related posts

• ⚙️ Go Tools: Code Generation from OpenAPI Specs in Go with oapi-codegen

  1 project | dev.to | 22 May 2025

• Looking back at `oapi-codegen`'s last year

  1 project | news.ycombinator.com | 19 May 2025

• Backward compatibility in NestJS

  2 projects | dev.to | 11 Feb 2025

• gRPC vs. REST: Understand gRPC, OpenAPI and REST and When to Use in API Design

  12 projects | news.ycombinator.com | 22 Jan 2025

• Show HN: Find your "holy grail piece", as a service

  2 projects | news.ycombinator.com | 17 Jan 2025

• Building and Deploying a New API (Part 1)

  3 projects | dev.to | 7 Jan 2025

• Stripe V2

  1 project | news.ycombinator.com | 6 Jan 2025
• A note from our sponsor - Stream
  getstream.io | 11 Jul 2025

  Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure. Learn more →

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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

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