PartyKit website screenshot

PartyKit

PartyKit is a real-time backend framework, now part of Cloudflare, that wraps Cloudflare Durable Objects with an opinionated developer experience for building multiplayer applications. It exposes a Party.Server library API for backend logic, a PartySocket client API for WebSockets, a Y-PartyKit Yjs integration, an HTTP/WebSocket interface at *.partykit.dev URLs, a CLI for local dev and deployment, and integrations with React, Next.js, and Remix.

PartyKit publishes 1 API on the APIs.io network: Deployed Party (HTTP / WebSocket). Tagged areas include Real-Time, Multiplayer, WebSockets, Cloudflare, and Durable Objects.

The PartyKit catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

PartyKit’s developer surface includes developer portal, documentation, engineering blog, GitHub presence, CLI, code examples, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
43.0/100 thin ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-07-21 · rubric v0.4
4 APIs 0 Features
Real-TimeMultiplayerWebSocketsCloudflareDurable ObjectsEdgeCRDTYjsServerless

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-21 · rubric v0.4
Composite quality — 43.0/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 6.1 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 3.4 / 13
Governance 7.9 / 12
Discoverability 10.0 / 10
Agent readiness — 19/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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/partykit: 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

PartyKit Party.Server (Server API)

Library API for defining server-side logic for a "party" - a backend object backed by a Cloudflare Durable Object. Provides lifecycle hooks for connections, messages, requests, ...

PartyKit PartySocket (Client API)

Browser and runtime client library for connecting to a PartyKit server over WebSockets. Wraps the standard WebSocket API with reconnection, buffering, and resilience. Runs in We...

Y-PartyKit (Yjs Integration)

Yjs provider for PartyKit that turns a party into a Yjs collaboration backend, enabling shared text, rich text, and structured CRDT documents across many clients.

PartyKit Deployed Party (HTTP / WebSocket)

Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each party is reachable at /parties/{party}/{room} and accepts WebSocket upgrad...

Pricing Plans

Partykit Plans Pricing

1 plans

PLANS

Rate Limits

Partykit Rate Limits

2 limits

RATE LIMITS

FinOps

Partykit Finops

FINOPS

Event Specifications

PartyKit Realtime Protocol

AsyncAPI description of the PartyKit realtime protocol. PartyKit is a realtime backend framework (acquired by Cloudflare) that wraps Cloudflare Durable Objects with an opinionat...

ASYNCAPI

API Governance Rules

PartyKit API Rules

4 rules · 4 warnings

SPECTRAL

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal
Portal

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Build 3

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub
 CLI
CLI
 Examples
Examples

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

Tutorials
Tutorials

Operate 1

Status, limits, changes, and where to get help

Community
Community

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: partykit
name: PartyKit
description: PartyKit is a real-time backend framework, now part of Cloudflare, that wraps Cloudflare Durable Objects with
  an opinionated developer experience for building multiplayer applications. It exposes a Party.Server library API for backend
  logic, a PartySocket client API for WebSockets, a Y-PartyKit Yjs integration, an HTTP/WebSocket interface at *.partykit.dev
  URLs, a CLI for local dev and deployment, and integrations with React, Next.js, and Remix.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/partykit/refs/heads/main/apis.yml
created: '2026-05-23'
modified: '2026-05-29'
specificationVersion: '0.19'
tags:
- Real-Time
- Multiplayer
- WebSockets
- Cloudflare
- Durable Objects
- Edge
- CRDT
- Yjs
- Serverless
apis:
- aid: partykit:party-server
  name: PartyKit Party.Server (Server API)
  description: Library API for defining server-side logic for a "party" - a backend object backed by a Cloudflare Durable
    Object. Provides lifecycle hooks for connections, messages, requests, alarms, and state persistence.
  humanURL: https://docs.partykit.io/reference/partyserver-api/
  baseURL: https://docs.partykit.io/reference/partyserver-api/
  tags:
  - Server API
  - Durable Objects
  - WebSockets
  - Hooks
  properties:
  - type: Documentation
    url: https://docs.partykit.io/reference/partyserver-api/
  - type: SDKs
    url: https://www.npmjs.com/package/partykit
  - type: SDKs
    url: https://www.npmjs.com/package/partyserver
- aid: partykit:partysocket
  name: PartyKit PartySocket (Client API)
  description: Browser and runtime client library for connecting to a PartyKit server over WebSockets. Wraps the standard
    WebSocket API with reconnection, buffering, and resilience. Runs in Web, ServiceWorker, Node.js, React Native, Cloudflare
    Workers, Deno, and Bun.
  humanURL: https://docs.partykit.io/reference/partysocket-api/
  baseURL: https://docs.partykit.io/reference/partysocket-api/
  tags:
  - Client SDK
  - WebSockets
  - Browser
  - Cross-Runtime
  properties:
  - type: Documentation
    url: https://docs.partykit.io/reference/partysocket-api/
  - type: SDKs
    url: https://www.npmjs.com/package/partysocket
- aid: partykit:y-partykit
  name: Y-PartyKit (Yjs Integration)
  description: Yjs provider for PartyKit that turns a party into a Yjs collaboration backend, enabling shared text, rich text,
    and structured CRDT documents across many clients.
  humanURL: https://docs.partykit.io/reference/y-partykit-api/
  baseURL: https://docs.partykit.io/reference/y-partykit-api/
  tags:
  - Yjs
  - CRDT
  - Collaboration
  properties:
  - type: Documentation
    url: https://docs.partykit.io/reference/y-partykit-api/
  - type: SDKs
    url: https://www.npmjs.com/package/y-partykit
- aid: partykit:deployed-party-http
  name: PartyKit Deployed Party (HTTP / WebSocket)
  description: Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each party
    is reachable at /parties/{party}/{room} and accepts WebSocket upgrades or HTTP requests.
  humanURL: https://docs.partykit.io/how-partykit-works/
  baseURL: https://{project}.{user}.partykit.dev
  tags:
  - HTTP
  - WebSocket
  - Rooms
  - Parties
  properties:
  - type: Documentation
    url: https://docs.partykit.io/how-partykit-works/
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/partykit/refs/heads/main/asyncapi/partykit-asyncapi.yml
common:
- type: DomainSecurity
  url: security/partykit-domain-security.yml
- type: Website
  url: https://www.partykit.io
- type: Portal
  url: https://docs.partykit.io
- type: Documentation
  url: https://docs.partykit.io
- type: Blog
  url: https://blog.partykit.io
- type: GitHub
  url: https://github.com/cloudflare/partykit
- type: CLI
  url: https://docs.partykit.io/reference/partykit-cli/
- type: Examples
  url: https://docs.partykit.io/examples/
- type: Tutorials
  url: https://docs.partykit.io/guides/
- type: TermsOfService
  url: https://www.cloudflare.com/website-terms/
- type: PrivacyPolicy
  url: https://www.cloudflare.com/privacypolicy/
- type: Community
  url: https://discord.gg/g5uqHQJc3z
maintainers:
- FN: Kin Lane
  email: kinlane@gmail.com