head to head · open source
fastapi vs openapi-typescript-codegen
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. openapi-typescript-codegen has 3,373 stars, 546 forks, 213 open issues and last shipped 9 days ago. fastapi leads on adoption by 3,000% (104,566 vs 3,373 stars). fastapi is written in Python under MIT; openapi-typescript-codegen is written in TypeScript under MIT. fastapi has attracted 10% as many forks as stars, openapi-typescript-codegen 16%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (openapi), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| fastapi | openapi-typescript-codegen | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 3.4K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-10-25 |
| Forks | ⑂ 10K | ⑂ 546 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 105K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick openapi-typescript-codegen if
- You want the openapi-typescript-codegen feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and openapi-typescript-codegen fits your workflow better
About fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production Documentation : Source Code : FastAPI is a modern, fast (high performance), web framework for building APIs with Python based on standard Python type hints. The key features are: Fast : Very high performance, on par with NodeJS and Go (thanks to Starlette and Pydantic). One of the fastest Python frameworks available. Fast to code : Increase the speed to develop features by about 200% to 300%. Fewer bugs : Reduce about 40% of human (developer) induced errors. Intuitive : Great editor support. Completion everywhere. Less time…
read the full fastapi overview →
About openapi-typescript-codegen
Important announcement [!IMPORTANT] Please migrate your projects to use @hey api/openapi ts Due to time limitations on my end, this project has been unmaintained for a while now. The @hey api/openapi ts project started as a fork with the goal to resolve the most pressing issues. going forward they are planning to maintain the OpenAPI generator and give it the love it deserves. Please support them with their work and make sure to migrate your projects: All open PR's and issues will be archived on the 1st of May 2024 All versions of this package will be deprecated in NPM 👋 Thanks for all the support, downloads…
read the full openapi-typescript-codegen overview →
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Frequently asked questions
Is fastapi or openapi-typescript-codegen more popular?
fastapi has 104,566 GitHub stars and openapi-typescript-codegen has 3,373. fastapi has the larger community by that measure.
Are fastapi and openapi-typescript-codegen free?
Both are open source. fastapi is licensed under MIT and openapi-typescript-codegen under MIT. Neither carries a licence fee.
What is the difference between fastapi and openapi-typescript-codegen?
fastapi is written in Python and openapi-typescript-codegen in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, fastapi or openapi-typescript-codegen?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose openapi-typescript-codegen if its feature set, stack or MIT licence fits better. Both are self-hostable.