Top 23 REST-API Open-Source Projects

1. Hoppscotch

   1 260 79,729 9.5 TypeScript

   Open source API development ecosystem.

   

   Project mention: API Testing Tools Worth Knowing in 2026 - Alternatives to Postman | dev.to | 2026-06-29

   Hoppscotch: https://hoppscotch.io

2. SaaSHub

   www.saashub.com featured

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

   

3. nocodb

   2 146 63,732 10.0 TypeScript

   🔥 🔥 🔥 A Free & Self-hostable Airtable Alternative

   

   Project mention: Best Headless CRM in 2026: Twenty vs EspoCRM vs Custom Build | dev.to | 2026-07-06

   NocoDB is an open-source Airtable alternative — a spreadsheet interface on top of a database. Some teams use it as a lightweight CRM, particularly in earlier stages when "CRM" mostly means "a shared table of contacts with some metadata."

4. bruno

   3 114 45,349 9.9 JavaScript

   Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

   

   Project mention: API Testing Tools Worth Knowing in 2026 - Alternatives to Postman | dev.to | 2026-06-29

   Bruno official site: https://www.usebruno.com

5. Fiber

   4 113 39,928 9.9 Go

   ⚡️ Express inspired web framework written in Go

   

   Project mention: Fiber – An Express-inspired web framework written in Go | news.ycombinator.com | 2026-02-06

6. insomnia

   5 258 39,832 9.8 TypeScript

   The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

   

   Project mention: Postman有料化対策：エンジニア向けおすすめAPIテストツール比較 | dev.to | 2026-03-04

   公式サイト: https://insomnia.rest/ GitHub: https://github.com/Kong/insomnia

7. httpie

   6 146 38,198 6.6 Python

   🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more. (by httpie)

   

   Project mention: 5 CLI Tools I Use to Keep Terminal Workflows Less Annoying | dev.to | 2026-05-07

   httpie is easier to read than curl when testing APIs manually.

8. go-zero

   7 107 33,172 9.1 Go

   A cloud-native Go microservices framework with cli tool for productivity.

   

9. Hasura

   8 237 32,081 9.6 TypeScript

   Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

   

   Project mention: One Brain to Query: Wiring a 60-Person Company into a Single Slack Bot | news.ycombinator.com | 2026-04-09

   Shameless plug: My org does this, and we deactived our Slack server to dogfood

   https://promptql.io

   By building Hasura [0], we already had the ability to generate data catalogs + metadata layer from DB's + API's so the foundational infra was there

   [0] https://github.com/hasura/graphql-engine

10. ntfy

    9 331 31,704 9.8 Go

    Send push notifications to your phone or desktop using PUT/POST

    

    Project mention: Anthropic reset everyone's Claude limits. I found out 5 hours late | dev.to | 2026-07-09

    I didn't want another app. I wanted a push notification that says "limits got reset, go use them". Turns out you can get pretty far with three public feeds and ntfy.sh, which is a free push service that needs no account:

11. swagger-ui

    10 172 28,873 9.1 JavaScript

    Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

    

    Project mention: Publishing OAS-Based API Doc on GitHub Pages | dev.to | 2026-03-15

    Most of the content is the same as what is written here.

12. openapi-generator

    11 264 26,490 9.9 Java

    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.

    */

13. api-guidelines

    12 19 23,295 5.2

    Microsoft REST API Guidelines

    

    Project mention: The Reality of API Routing, HTTP Intents, and URL Architecture (2026) | dev.to | 2026-04-20

    Microsoft API Design Guidelines - Real-world enterprise consistency standards.

14. chi

    13 116 22,510 6.7 Go

    lightweight, idiomatic and composable router for building Go HTTP services

    

    Project mention: Go vs Rust: the only backend language debate that actually matters in 2026 | dev.to | 2026-05-14

    The broader ecosystem is settled too. Gin and Chi for HTTP routing, sqlc for type-safe queries, Wire for dependency injection if that’s your thing. The compiler errors are readable. Onboarding a new engineer onto a Go codebase takes days, not weeks.

15. parse-server

    14 43 21,403 9.7 JavaScript

    Parse Server for Node.js / Express

    

    Project mention: AI Coding: Building a 1-Hour App Clone Is Easy. Shipping It Is the Work | dev.to | 2026-03-18

    If you’re coming from the Parse ecosystem, it may help to know that Parse itself is a long-running open source backend framework. You can start from the official Parse Platform site, or go deeper with the community’s Parse Server repository. Our own developer docs are organized around that reality. If you want implementation-level guides, start with our SashiDo Documentation.

16. gofr

    15 27 21,232 9.8 Go

    An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability.

    

    Project mention: GoFr: An Opinionated Microservice Development Framework | dev.to | 2026-02-07

    [1] gofr-dev/gofr. (n.d.). gofr: An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability. GitHub. Retrieved from https://github.com/gofr-dev/gofr

17. grpc-gateway

    16 34 19,948 9.9 Go

    gRPC to JSON proxy generator following the gRPC HTTP spec

    

    Project mention: Why gRPC Is Ideal for High-Performance APIs | dev.to | 2026-01-20

    gRPC-Gateway reads protobuf service definitions and generates a reverse proxy that translates RESTful JSON HTTP calls into gRPC, based on annotations like google.api.http. (GitHub)

18. swagger-petstore

    17 30 17,762 7.9 Mustache

    swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

    

    Project mention: Oq: Terminal OpenAPI Spec Viewer | news.ycombinator.com | 2025-09-12

19. scalar

    18 28 15,466 9.9 TypeScript

    Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

    

    Project mention: Build a versioned Laravel API with auto-generated OpenAPI docs in 10 minutes | dev.to | 2026-06-10

    Open GET /api/doc in a browser. You don't get a raw JSON file — you get a ready-to-use interactive API reference (rendered with Scalar), with a version switcher across v1, v2, … already wired up. The package walked your controllers, read those docblocks, and produced a complete OpenAPI 3.0 document — parameters, enums, response schemas, the lot. These docs can't drift, because they are the code.

20. modular-monolith-with-ddd

    19 19 13,701 7.0 C#

    Full Modular Monolith application with Domain-Driven Design approach.

    

    Project mention: I Curated 106 Software Design Resources and Ranked What Actually Matters | dev.to | 2026-02-12

    kgrzybek/modular-monolith-with-ddd — The most complete Modular Monolith example I've seen. C#, but the patterns are universal.

21. posting

    20 9 12,102 8.5 Python

    The modern API client that lives in your terminal.

    

    Project mention: Slumber a TUI HTTP Client | news.ycombinator.com | 2026-05-21

22. SpaceX-API

    21 13 10,854 0.0 JavaScript

    :rocket: Open Source REST API for SpaceX launch, rocket, core, capsule, starlink, launchpad, and landing pad data.

    

    Project mention: I Built a SpaceX Launch Tracker in 50 Lines of Python (No API Key Needed) | dev.to | 2026-03-25

    The SpaceX REST API is completely free, requires no authentication, and returns beautifully structured JSON about every launch since 2006.

23. Restify

    22 8 10,688 3.1 JavaScript

    The future of Node.js REST development

    

24. frappe

    23 5 10,365 10.0 Python

    Low code web framework for real world applications, in Python and Javascript

    

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