CouchDB stores documents as JSONJavaScript Object Notation — a lightweight text format for structured data exchange on the web. with MapReduce views and multi-master replication — offline-first mobile sync (via PouchDB) and eventual consistency without a rigid schema. Example: a field worker saves `{_id: 'job-42', status: 'done'}` offline; CouchDB syncs when connectivity returns.

CouchDB 0.7.0 stabilized the JSONJavaScript Object Notation — a lightweight text format for structured data exchange on the web. RESTRepresentational State Transfer — a style for web APIs using HTTP methods and resource URLs. APIApplication programming interface — a defined way for programs to talk to each other or to a service. that defined document-database ergonomics.

It proved document stores with HTTPHyperText Transfer Protocol — the protocol browsers use to request and receive web pages. interfaces and replication could work in production.