CouchDB
CouchDB is an open-source NoSQL document-oriented database that stores data in JSON format and uses JavaScript for querying and indexing via MapReduce. It is designed for high availability and scalability, featuring a distributed architecture with multi-master replication and an HTTP-based RESTful API for easy integration. CouchDB is known for its reliability, offline-first capabilities, and conflict resolution mechanisms, making it suitable for web and mobile applications.
Developers should learn CouchDB when building applications that require offline functionality, real-time synchronization, or distributed data storage, such as collaborative tools, mobile apps, and IoT systems. It is particularly useful for scenarios where data consistency and availability are critical, as its replication features allow seamless data sync across devices and servers. CouchDB's JSON-based document model also simplifies development for web applications using JavaScript stacks.