Apache CouchDB is a free and open-source NoSQL database solution. Apache CouchDB has a document-oriented NoSQL database architecture and is implemented in the concurrency-oriented language Erlang; Apache CouchDB uses JSON to store data with documents, it uses JavaScript as its query language using MapReduce, and it uses RESTful HTTP for its API. CouchDB works smoothly with all latest modern web and mobile applications. All of this makes for a pretty seamless database experience. Let’s get started with installing CouchDB.