compare

Fastify vs hapi

The same facts for both, read from GitHub every night, and the relation a person reviewed.

Fastify vs hapi
Fact	Fastify	hapi
Language	JavaScript	JavaScript
Licence	MIT	Other
Stars	37k	15k
Latest	v5.12.5	v21.3.0
Last push	2026-10-06	2026-09-16
Release cadence	about 6 days between releases	about 92 days between releases
Active contributors	34 commit authors on the default branch in the last 90 days	4 commit authors on the default branch in the last 90 days
Flags	none	none

How they relate

Both replace Express. Alternatives to Express →
Full replacementFastifySchema-based validation and serialisation, and a plugin system.
Full replacementhapiConfiguration-centric routes and a plugin system instead of middleware chains, with validation built in.