Fastify 5.12.1

Fast and low overhead web framework, for Node.js

fastify@5.12.1 was published on 2026-08-18. Its manifest declares 15 runtime dependencies and 0 peer requirements. Type declarations are bundled according to the package metadata. No Node.js engine requirement is declared in this manifest.

All Fastify versions · Permanent reference to 5.12.1 · Latest release

Package specifications

Version5.12.1
License declarationMIT
Published2026-08-18T19:51:15.791Z
Node.js requirementNot declared
Type declarationsBundled declarations
Runtime dependency count15
Peer requirement count0
Optional dependency count0
Minified sizeMeasurement not available yet
Minified + gzipMeasurement not available yet
Unpacked distribution size2914.66 KiB
Published file count371
Package typecommonjs
ES module entryNot declared
Default entryfastify.js
Side effects declarationNot declared
Direct advisories5
Resolved graph dependencies47
Repository stars37280
Repository forks3023

Install Fastify 5.12.1

npm install fastify@5.12.1
pnpm add fastify@5.12.1
yarn add fastify@5.12.1

Runtime dependencies

Peer requirements

  • None declared

Optional dependencies

  • None declared

Resolved dependency graph

This deps.dev graph describes a generic 64-bit Linux environment, not your application lockfile.

How to interpret the specifications

Bundlephobia measurements use its standard package build and may exclude peer dependencies. Unpacked npm distribution size includes shipped files and is a different measurement. Module declarations do not prove tree-shaking or runtime compatibility.

Advisories apply to this package version directly; transitive dependencies need separate inspection. Repository signals describe the whole repository and are current observations, including on historical-version pages.

Known direct advisories

OpenSSF repository checks

Provider assessment: 2026-08-24T00:00:00Z. These are repository checks, not a jsL maintenance score.

Code-Review7/10 — Found 21/30 approved changesets -- score normalized to 7
Security-Policy10/10 — security policy file detected
Maintained10/10 — 30 commit(s) and 15 issue activity found in the last 90 days -- score normalized to 10
Dangerous-Workflow10/10 — no dangerous workflow patterns detected
Binary-Artifacts10/10 — no binaries found in the repo
CII-Best-Practices5/10 — badge detected: Passing
Token-Permissions10/10 — GitHub workflow tokens follow principle of least privilege
Pinned-Dependencies5/10 — dependency not pinned by hash detected -- score normalized to 5
License10/10 — license file detected
Fuzzing10/10 — project is fuzzed
Branch-Protection6/10 — branch protection is not maximal on development and all release branches
SAST3/10 — SAST tool is not run on all commits -- score normalized to 3

Compare Fastify

Evidence and freshness