Cloudflare KV

Workers KV is a key-value data store replicated across Cloudflare's edge network. Optimized for high-read, low-write workloads.

Key Features

• Global replication with read-after-write consistency
• Sub-50ms reads at the edge
• Max value size — 25 MB
• Max key size — 512 bytes
• TTL support for automatic expiration
• Direct access from Workers via binding
• REST API for external access

Use Cases

• Configuration storage
• Feature flags
• Static asset serving
• Session state (best-effort)
• A/B test configurations

Limitations

• Eventually consistent (not suitable for transactional data)
• Higher write latency (propagation across global network)

Related

• Cloudflare Workers — Primary access pattern
• Cloudflare D1 — Relational alternative
• Cloudflare R2 — Object storage alternative