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. Learn more →
Top 23 TypeScript API Projects
- Project mention: Hoppscotch: The Modern, Lightweight Alternative to Postman and Bruno | dev.to | 2025-12-18
Enter Hoppscotch, the open-source API development suite that’s rapidly gaining popularity. It’s a powerful, lightweight, and beautifully designed tool that challenges the way we think about API testing and collaboration.
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SurveyJS
SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control. Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.
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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: Top 11 Open Source No-Code AI Tools with the Most GitHub Stars | dev.to | 2025-10-20Official website: https://strapi.io/
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Leverage libraries like tRPC or GraphQL with TypeScript to ensure type safety across the stack:
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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 / GitHub：https://insomnia.rest
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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.
Project mention: Ask HN: Looking for Headless CMS Recommendation | news.ycombinator.com | 2025-09-03Im using directus (https://directus.io/) for my personal website with a vacation blog and some posts…
So far it works pretty well and my gf is also able to use it on her own, so you could say its non-tech user approved haha
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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: My personal favorite MCP server which has became part of my life | dev.to | 2025-05-27GitHub: github.com/hasura/graphql-engine
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Stream
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.
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- Project mention: Testing de SPAs con Vitest Browser Mode: Velocidad de Unit Tests con Confianza E2E | dev.to | 2025-12-21
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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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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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- Project mention: 👽 Extract Thousands of Rows of Data Without Writing Code (Open Source) | dev.to | 2025-07-17
Explore the project on GitHub: https://github.com/getmaxun/maxun
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scalar
Scalar is an open-source API platform: 🌐 Modern Rest API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
Scalar, recommended by former Stoplight PM Phil Sturgeon, offers an MIT-licensed core, living docs, and transparent pricing. It renders OpenAPI (and soon AsyncAPI/GraphQL) extremely fast with universal theming.
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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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API Platform
🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.
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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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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.
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).
TypeScript API discussion
TypeScript API related posts
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I Stopped Using useEffect for Data Fetching in React
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Hoppscotch: The Modern, Lightweight Alternative to Postman and Bruno
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もうPostmanに頼らない！2025年開発者が選ぶ無料APIツール15選
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Building Type-Safe APIs with itty-spec: A Contract-First Approach
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open-wearables VS TerraiOS - a user suggested alternative
2 projects | 8 Dec 2025 -
We created API-Bench to test how well LLMs execute against APIs
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Show HN: Superglue – OSS integration tool that understands your legacy systems
- A note from our sponsor - InfluxDB www.influxdata.com | 22 Dec 2025
Index
What are some of the best open-source API projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Hoppscotch | 77,328 |
| 2 | Strapi | 70,718 |
| 3 | trpc | 39,160 |
| 4 | insomnia | 37,686 |
| 5 | Directus | 33,765 |
| 6 | SWR | 32,218 |
| 7 | Hasura | 31,844 |
| 8 | Medusa | 31,451 |
| 9 | msw | 17,440 |
| 10 | amplication | 15,990 |
| 11 | apitable | 15,148 |
| 12 | Brain.js | 14,810 |
| 13 | maxun | 14,054 |
| 14 | scalar | 13,223 |
| 15 | crystal | 12,875 |
| 16 | API Platform | 9,068 |
| 17 | urql | 8,907 |
| 18 | TypeGraphQL | 8,088 |
| 19 | mockoon | 7,955 |
| 20 | dicebear | 7,882 |
| 21 | vendure | 6,934 |
| 22 | cofounder | 6,635 |
| 23 | rushstack | 6,383 |
Sponsored
SurveyJS: Build JSON-Driven Surveys and Forms with Full Data Control
Add the SurveyJS UI components to your JS app (React/Angular/Vue3). Securely collect and analyze data without sending it to 3rd-party servers. Fully customizable, works with any backend, and ideal for data-heavy apps. Learn more.
surveyjs.io