head to head · open source
fastapi vs mockttp
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. mockttp has 883 stars, 113 forks, 40 open issues and last shipped yesterday. fastapi leads on adoption by 11,497% (102,402 vs 883 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%. mockttp 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 | ★ 102K | ★ 883 |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 9.9K | ⑂ 113 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 102K 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 is an MIT licensed, high performance Python web framework for building APIs with standard Python type hints, aimed at Python developers and teams that need production ready HTTP services with automatic OpenAPI documentation.
read the full fastapi overview →
About mockttp
Mockttp is an HTTP mock server and proxy library written in TypeScript and released under the Apache 2.0 license. It lives in the JavaScript and Node.js ecosystem, installed as a development dependency from npm, and it is part of HTTP Toolkit, where it powers all of the HTTP internals of that product. The same code that drives the interactive HTTP Toolkit application can therefore be used as a headless script, which makes the library both a testing tool and a scriptable rewriting proxy for capturing, inspecting and modifying HTTP traffic.
read the full mockttp overview →
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Frequently asked questions
Is fastapi or mockttp more popular?
fastapi has 102,402 GitHub stars and mockttp has 883. 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 (102,402 stars) or its MIT licence terms. Choose mockttp if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.