CouchDB
CouchDB is an open-source NoSQL document-oriented database that uses JSON for documents, JavaScript for MapReduce queries, and HTTP for an API. It is designed for web applications and offers features like multi-master replication, which allows data to be synchronized across multiple servers or devices. CouchDB emphasizes reliability and scalability, making it suitable for distributed systems and offline-first applications.
Developers should learn CouchDB when building applications that require offline capabilities, real-time synchronization, or distributed data storage, such as mobile apps, collaborative tools, or IoT systems. Its replication model simplifies data sync across devices, and its RESTful API integrates easily with web technologies, reducing backend complexity for JSON-based applications.