CouchDB is a document-oriented database that uses JSON documents, has a RESTful HTTP API, and employs map/reduce views for querying data. This tutorial will teach web developers the concepts they need to get started using CouchDB in their projects. Libraries are available for CouchDB’s RESTful HTTP API in many programming languages and we will take a look at some of the more popular ones.
One of the key properties of RESTful Web applications is the ability to evolve over time. Too many Web APIs don’t evolve; they just get old, and useless; they rot. Why? Because they are little more than URI-based RPC calls returning serialized objects. Instead, Web APIs should rely on well-crafted media-type messages driven by links; they should be more RESTful.