CouchDB is a document-oriented databases which is similar to MongoDB in its data model and data management mechanism. It is written in Erlang . It is currently not a distributed database. However, it can be also used for applications which are written in JavaScript. The documents are stored and accessed as JSON objects. CouchDB has no support for document types or equivalent to tables. Therefore, developers have to build the document type distinction by themselves. (e.g. a type attribute in each document). An interesting feature in CouchDB is that it support de ning a validation functions so that if the document is updated or created, the validation functions are triggered to approve or validate the operations. CouchDB can be also tuned to provide either strong consistency or eventual consistency guarantees.
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