compare
Fastify vs Koa
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Fastify | Koa |
|---|---|---|
| Language | JavaScript | JavaScript |
| Licence | MIT | MIT |
| Stars | 37k | 36k |
| Latest | v5.12.5 | v3.2.1 |
| Last push | 2026-10-06 | 2026-09-19 |
| Release cadence | about 6 days between releases | about 42 days between releases |
| Active contributors | 34 commit authors on the default branch in the last 90 days | 7 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Fastify replaces Koa. Alternatives to Koa →
Full replacementPlugin architecture with schema-based validation and serialisation.
Fastify
- v6.0.0-alpha.42026-09-17Fix forpre-release
- v5.12.52026-09-16Fix for
- v5.12.42026-09-11Fixed the fastify.js version mismatch.
- v6.0.0-alpha.32026-09-04Fix forpre-release
- v5.12.22026-09-04Fix for
Koa
- v3.2.12026-05-21fix: request.length overflows on Content-Length > 2GB
- v3.2.02026-03-28docs: remove dead Job Board links
- v2.16.42026-02-25fix(security): Host Header Injection via ctx.hostname by @killagu
- v3.1.22026-02-25fix: typo in troubleshooting.md
- v3.1.12025-10-27fix: only original value destroy if the new value is not a stream
Fastify
✓ signed The latest release, v5.12.5, carries a signature GitHub verified.
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Koa
✓ signed The latest release, v3.2.1, carries a signature GitHub verified.
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