Fastify website screenshot

Fastify

Fastify is a fast and low-overhead web framework for Node.js, designed for building high-performance APIs and microservices. It features a powerful plugin architecture, JSON Schema-based request and response validation, automatic serialization, comprehensive logging with Pino, and TypeScript support out of the box.

Fastify publishes 1 API on the APIs.io network. Tagged areas include Frameworks, High Performance, JavaScript, JSON-Schema, and Node.js.

The Fastify catalog on APIs.io includes 1 Spectral governance ruleset.

Fastify’s developer surface includes documentation, getting-started guide, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
24.1/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessFreemium
1 APIs
FrameworksHigh PerformanceJavaScriptJSON-SchemaNode.jsTypeScript

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 24.1/100 · emerging
Contract Quality 3.5 / 25
Developer Ergonomics 4.8 / 20
Access Clarity 3.2 / 20
Operational Transparency 4.8 / 13
Contract Governance 1.2 / 12
Discoverability 6.7 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fastify: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Fastify

Fastify is a fast and low-overhead web framework for Node.js, designed for building high-performance APIs and microservices. It features a powerful plugin architecture, JSON Sch...

Pricing Plans 1

Published pricing tiers and plan structures.

Fastify Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fastify Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Fastify Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Fastify API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Fastify Plugin and Server Configuration

18 properties

JSON SCHEMA

Fastify Route Schema Definition

10 properties

JSON SCHEMA

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fastify Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide
ContributionGuide
 Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LlmsText
LlmsText

Build 4

SDKs, sample code, and the tooling you integrate with

CodeOfConduct
CodeOfConduct
 GitHubOrganization
GitHubOrganization
 GitHubRepository
GitHubRepository
 Plugins
Plugins

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy
SecurityPolicy
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 Releases
Releases

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Benchmarks
Benchmarks

Source (apis.yml)

apis.yml Raw ↑ 
aid: fastify
name: Fastify
description: Fastify is a fast and low-overhead web framework for Node.js, designed for building high-performance APIs and
  microservices. It features a powerful plugin architecture, JSON Schema-based request and response validation, automatic
  serialization, comprehensive logging with Pino, and TypeScript support out of the box.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fastify.png
tags:
- Frameworks
- High Performance
- JavaScript
- JSON-Schema
- Node.js
- TypeScript
tags_raw:
- Frameworks
- High Performance
- JavaScript
- JSON Schema
- Node.js
- TypeScript
url: https://raw.githubusercontent.com/api-evangelist/fastify/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: fastify:fastify
  name: Fastify
  description: Fastify is a fast and low-overhead web framework for Node.js, designed for building high-performance APIs and
    microservices. It features a powerful plugin architecture, JSON Schema-based request and response validation, automatic
    serialization, comprehensive logging with Pino, and TypeScript support out of the box.
  humanURL: https://fastify.dev/
  tags:
  - Frameworks
  - High Performance
  - JavaScript
  - JSON-Schema
  - Node.js
  - TypeScript
  tags_raw:
  - Frameworks
  - High Performance
  - JavaScript
  - JSON Schema
  - Node.js
  - TypeScript
  properties:
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/fastify/refs/heads/main/json-schema/fastify-route-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/fastify/refs/heads/main/json-schema/fastify-plugin-config.json
common:
- type: IssueTracker
  url: https://github.com/fastify/fastify/issues
- type: Releases
  url: https://github.com/fastify/fastify/releases
- type: SecurityPolicy
  url: https://github.com/fastify/fastify/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/fastify/fastify/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/fastify/fastify/blob/main/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/fastify/fastify/blob/main/LICENSE
- type: DomainSecurity
  url: security/fastify-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/fastify-dev
- type: Website
  url: https://fastify.dev/
- type: Documentation
  url: https://fastify.dev/docs/latest/
- type: GettingStarted
  url: https://fastify.dev/docs/latest/Guides/Getting-Started/
- type: GitHubOrganization
  url: https://github.com/fastify
- type: GitHubRepository
  url: https://github.com/fastify/fastify
- type: Blog
  url: https://medium.com/@fastifyjs
- type: Plugins
  url: https://fastify.dev/ecosystem/
- type: Benchmarks
  url: https://fastify.dev/benchmarks/
- type: Integrations
  url: https://fastify.dev/ecosystem/
- type: LlmsText
  url: https://fastify.dev/llms.txt
integrations:
- name: Fastify Cheetah
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com