head to head · open source
fastapi vs aws-lambda-fastify
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. aws-lambda-fastify has 560 stars, 37 forks, 5 open issues and last shipped 7 days ago. fastapi leads on adoption by 18,573% (104,566 vs 560 stars). fastapi is written in Python under MIT; aws-lambda-fastify is written in JavaScript under MIT. fastapi has attracted 10% as many forks as stars, aws-lambda-fastify 7%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api), 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 | aws-lambda-fastify | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 560 |
| License | MIT | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 10K | ⑂ 37 |
| 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 aws-lambda-fastify if
- You want the aws-lambda-fastify feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and aws-lambda-fastify 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 aws-lambda-fastify
Introduction Inspired by the Code Genie serverless express library tailor made for the Fastify web framework. No use of internal sockets, makes use of Fastify's inject function. Seems faster (as the name implies) than serverless express and aws serverless fastify 😉 👨🏻💻Installation Options @fastify/aws lambda can take options by passing them with : awsLambdaFastify(app, options) serializeLambdaArguments Activate the serialization of lambda Event and Context in http header x apigateway event x apigateway context false (was true for reply.send({ hello: 'world' })) // Responses gain Content Encoding: br gzip…
read the full aws-lambda-fastify overview →
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Frequently asked questions
Is fastapi or aws-lambda-fastify more popular?
fastapi has 104,566 GitHub stars and aws-lambda-fastify has 560. fastapi has the larger community by that measure.
Are fastapi and aws-lambda-fastify free?
Both are open source. fastapi is licensed under MIT and aws-lambda-fastify under MIT. Neither carries a licence fee.
What is the difference between fastapi and aws-lambda-fastify?
fastapi is written in Python and aws-lambda-fastify in JavaScript. 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 aws-lambda-fastify?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose aws-lambda-fastify if its feature set, stack or MIT licence fits better. Both are self-hostable.