Document-Oriented Storage
JSON document model for flexible schema design
Attachment support for binary data storage
Revision-based document versioning
ACID semantics for reliable data integrity
Bulk operations for efficient batch processing
Optimistic concurrency with revision tracking
Synchronization Built-in
Multi-master replication for distributed data
Bi-directional sync between any CouchDB instances
Incremental replication with change tracking
Conflict detection and resolution strategies
Filtered replication for selective data sync
Checkpoint-based resumable replication
Offline-First Capabilities
Local-first data access for mobile applications
Seamless offline to online transition
Automatic conflict management
Background sync when connectivity returns
PouchDB integration for browser-based applications
Data synchronization across devices
Scalable Architecture
Distributed clustering with no single point of failure
Consistent hash-based sharding for horizontal scaling
Elastic cluster membership changes
Zero-downtime scaling operations
Multi-datacenter support for geographic distribution
Configurable quorum-based consistency
Powerful Queries
MapReduce views for indexed queries
Secondary indexes for efficient data access
Full-text search through integration
Mango Query for MongoDB-style querying
Aggregation functions for data analysis
Range queries for numeric and string data
RESTful API
HTTP/JSON interface for all operations
Simple CRUD operations with standard methods
Cross-platform compatibility
Streaming APIs for change notifications
Attachment handling via standard HTTP
Batch operations for efficiency
Security Features
Role-based access control
Database-level security
Document-level access control
SSL/TLS support for encrypted connections
Proxy authentication support
OAuth integration capability
Developer Experience
Built-in administration web interface (Fauxton)
RESTful API for programmatic access
Client libraries for all major languages
Comprehensive documentation
Active open-source community
Debugging and monitoring tools
Enterprise Readiness
Clustering for high availability
Backup and disaster recovery options
Performance monitoring and optimization
Multi-tenant architecture support
Cross-datacenter replication