Collaborative editors
Build text and rich-content experiences on top of a broader conflict-free JSON model.
Build real-time collaborative apps
json-joy gives TypeScript teams the libraries, protocols, and specifications to build collaborative and local-first software on top of a conflict-free JSON data model.
Open source. Open specs. Conflict-free by design.
Playground
JSON CRDT Explorer
An app to explore, debug, and edit your JSON CRDT and plain JSON documents. Time travel, see patches, save in different formats, inspect CRDT internals.
01Full JSON CRDT02Open specifications03TypeScript-first packages04Editor and UI integrations05Benchmarks
Data, text, rich-text — one core.
json-joy can model all three in the same document.
Collaborative plain text
Text
Bind a json-joy text node to a DOM <input>, a <textarea>, or any code editor. The text stays mergeable across users, tabs, and devices.
JSON CRDT
JSON
Model full app or document state as conflict-free JSON. Concurrent edits from multiple users merge cleanly.
Collaborative rich text
Rich-text
Rich-text CRDT built on the same conflict-free JSON model. Concurrent formatting, structural edits, and offline changes converge cleanly, across users and AI co-authors.
Open source
Libraries
Drop-in packages that make up the json-joy stack.
Library
json-joy JavaScript
Reference implementation of JSON CRDT and other collaborative editing utilities.
TypeScript
Library
Collaborative React.js
React hooks, context, and components for binding UI to JSON CRDT models and nodes.
React.js
Library
Clickable JSON — UI
React components for rendering JSON and JSON CRDT documents as interactive clickable and editable trees.
React.js
Open standards
Specifications
The specs behind the protocols and data types.
Specificationworking draft
JSON CRDT
JSON (and CBOR) Conflict-free Replicated Data Type model semantics and algorithm specification.
Specificationworking draft
JSON CRDT Patch
Patch specification for JSON CRDT, a conflict-free data type for JSON documents.
Specificationworking draft
JSON Reactive RPC
JSON-Rx is a simple bi-directional messaging protocol which supports RPC, subscription streams, and one-way notifications.
What teams build with json-joy
Local-first internal tools
Keep structured state mergeable across users, devices, and offline sessions.
Multiplayer product workflows
Power shared dashboards, builders, and knowledge tools where concurrent edits are normal.
Sync-heavy developer products
Reuse open protocols and libraries instead of inventing a custom collaboration backend.