head to head · open source
fastapi vs mockttp
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. mockttp has 888 stars, 117 forks, 40 open issues and last shipped 5 days ago. fastapi leads on adoption by 11,675% (104,566 vs 888 stars). fastapi is written in Python under MIT; mockttp is written in TypeScript under Apache-2.0. fastapi has attracted 10% as many forks as stars, mockttp 13%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | mockttp | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 888 |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-10-29 |
| Forks | ⑂ 10K | ⑂ 117 |
| 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 mockttp if
- You want the mockttp feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and mockttp 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 mockttp
Mockttp Part of HTTP Toolkit: powerful tools for building, testing & debugging HTTP(S) Mockttp lets you intercept, transform or test HTTP requests & responses in JavaScript quickly, reliably & anywhere. You can use Mockttp for integration testing, by intercepting real requests as part of your test suite, or you can use Mockttp to build custom HTTP proxies that capture, inspect and/or rewrite HTTP in any other kind of way you like. HTTP testing is the most common and well supported use case. There's a lot of tools to test HTTP, but typically by stubbing the HTTP functions in process at the JS level. That ties you…
read the full mockttp overview →
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Frequently asked questions
Is fastapi or mockttp more popular?
fastapi has 104,566 GitHub stars and mockttp has 888. fastapi has the larger community by that measure.
Are fastapi and mockttp free?
Both are open source. fastapi is licensed under MIT and mockttp under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and mockttp?
fastapi is written in Python and mockttp 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 mockttp?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose mockttp if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.