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Top 23 TypeScript API Projects
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Project mention: The $847/year Developer Tool Stack That Replaced My $4,200 SaaS Subscriptions | dev.to | 2026-03-24
Hoppscotch is open-source, runs in the browser, and does everything I used Postman for. Collections, environments, WebSocket testing — all there.
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Strapi
🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.
Project mention: Three Ways to Convert JSON to TypeScript. Only One Is Deterministic. | dev.to | 2026-04-27CMS content. Headless CMS responses from Strapi, Sanity, or Contentful are deeply nested. Type them once; let the compiler catch template bugs.
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insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
公式サイト: https://insomnia.rest/ GitHub: https://github.com/Kong/insomnia
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Directus
The flexible backend for all your projects 🐰 Turn your DB into a headless CMS, admin panels, or apps with a custom UI, instant APIs, auth & more.
How does Directus 2026.0 compare to NocoDB 2026.1 for teams needing custom API extensions?
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Early Medusa v2 had two related bugs — #11766 and #13301. Stripe charged the card, webhooks fired, but order.paid_total stayed at 0 and the payment status never advanced past pending. Every order had to be manually marked paid in the admin — which also meant no order confirmation email fired, since the email subscriber was gated on a completed order. Customers paid, heard nothing, and had to be chased manually.
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Project mention: GraphQL vs REST: 18 Claims Fact-Checked with Primary Sources (2026) | dev.to | 2026-04-17
Historically, measurements around 40–45 KB gzipped were reasonable for older Apollo Client bundles , but recent v4.x releases have reduced bundle size and made features more modular. Regardless, that is not a cost of GraphQL itself. The same concern exists for feature‑rich REST clients like SWR or TanStack Query . It is a misleading comparison because both REST and GraphQL can be implemented with nothing more than fetch(). Therefore, the theoretical baseline for both styles is 0 KB.
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Hasura
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 | 2026-04-09Shameless 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
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MSW
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amplication
Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows that drive consistency, enable high-quality code practices, simplify onboarding, and accelerate standardized delivery across teams.
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maxun
🔥 The open-source no-code platform for web scraping, crawling, search and AI data extraction • Turn websites into structured APIs in minutes 🔥
Project mention: 👽 Extract Thousands of Rows of Data Without Writing Code (Open Source) | dev.to | 2025-07-17Explore the project on GitHub: https://github.com/getmaxun/maxun
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apitable
🚀🎉📚 APITable, an API-oriented low-code platform for building collaborative apps and better than all other Airtable open-source alternatives.
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scalar
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 | 2026-06-10Open 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.
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crystal
🔮 Graphile's Crystal Monorepo; home to Grafast, PostGraphile, pg-introspection, pg-sql2 and much more! (by graphile)
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Project mention: Best integration platform for mail and calendar integrations (2026) | dev.to | 2026-06-03
Nango is the integration platform where coding agents build integrations. Engineers, or coding agents like Claude Code, Cursor, and Codex, write integrations as code in your repo, and Nango’s cloud runtime runs them securely and at scale.
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urql
The highly customizable and versatile GraphQL client with which you add on features like normalized caching as you grow.
| Tool | What it Does | | :-------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------------------------------- | | Apollo Client | A complete state management solution that handles caching, optimistic UI updates, and error management. | | Relay | Facebook's industrial-strength GraphQL client that brings compile-time optimizations and strong type safety to your React applications. | | urql | A lightweight alternative for teams that want more control over their implementation. |
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mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
公式サイト / GitHub：https://mockoon.com
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presenton
Open-Source AI Presentation Generator and API (Gamma, Beautiful AI, Decktopus Alternative)
Project mention: Show HN: Open-Source API for AI Presentation Generation | news.ycombinator.com | 2025-07-18 -
Item Content Current Version 2.0.0-rc.2 GitHub https://github.com/MichalLytek/type-graphql Documentation https://typegraphql.com First Commit 2018-01-09 Latest Commit 2026-01-01
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Requestly
Requestly was built to save developers time by intercepting and modifying HTTP Requests. It has now developed into an open-source alternative to Charles Proxy and Telerik Fiddler that works directly in browsers without VPN and proxy Issues. It is used by more than 200,000+ front-end developers and 11,000+ companies worldwide.
Project mention: Why You Need a Local-First API Client (With Hands-On Example) | dev.to | 2025-11-30If you want to try a local-first workflow, you can start using Requestly here: https://requestly.com
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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).
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Index
What are some of the best open-source API projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Hoppscotch | 79,511 |
| 2 | Strapi | 72,350 |
| 3 | trpc | 40,307 |
| 4 | insomnia | 38,488 |
| 5 | Directus | 35,995 |
| 6 | Medusa | 34,349 |
| 7 | SWR | 32,400 |
| 8 | Hasura | 32,054 |
| 9 | msw | 17,965 |
| 10 | amplication | 16,013 |
| 11 | maxun | 15,855 |
| 12 | apitable | 15,387 |
| 13 | scalar | 15,225 |
| 14 | Brain.js | 14,866 |
| 15 | crystal | 12,926 |
| 16 | nango | 10,457 |
| 17 | urql | 8,949 |
| 18 | mockoon | 8,298 |
| 19 | presenton | 8,139 |
| 20 | TypeGraphQL | 8,089 |
| 21 | Requestly | 6,725 |
| 22 | cofounder | 6,641 |
| 23 | rushstack | 6,472 |
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