S.no CouchDB MongoDB
1. In CouchDB, the records are stored in the documents in the database. In MongoDB, the records are stored in the collection in the database
2. Master-Master replication in CouchDB Master-Slave replication in MongoDB
3. CouchDB is written in Erlang MongoDB is written in C++
4. In CouchDB, the interface is REST/HTTP In MongoDB, the interface is TCP/IP Custom Protocol
5. Slower than MongoDB Faster than CouchDB
BY Best Interview Question ON 26 Mar 2019