cloudflare-queues

Status : Production Ready ✅ Last Updated : 2026-01-09 Dependencies : cloudflare-worker-base (for Worker setup) Latest Versions : wrangler@4.58.0, @cloudflare/workers-types@4.20260109.0 Recent Updates (2025) : Critical Limits: New in May 2025 : Publish messages to queues via HTTP from any service or programming language. Source : Cloudflare Changelog Authentication : Requires Cloudflare API token with Queues Edit permissions. Use Cases : New in August 2025 : Subscribe to events from Cloudflare services and consume via Queues. Source : Cloudflare Changelog Supported Event Sources : Create Subscription : Event Structure : Consumer Example : Use Cases : Critical: ALWAYS use explicit ack() for: Database writes, API calls, financial transactions Why? Prevents duplicate writes if one message in batch fails. Failed messages retry independently. ⚠️ Without DLQ, failed messages are DELETED PERMANENTLY after max_retries wrangler.jsonc: DLQ Consumer: This skill prevents 13 documented issues: Error : Queue messages sent in one wrangler dev process don't appear in another wrangler dev consumer process Source : GitHub Issue #9795 Why It Happens : The virtual queue used by wrangler is in-process memory. Separate dev processes cannot share the queue state. Prevention : Error : All routes return 500 Internal Server Error when using wrangler dev --remote with queue bindings Source : GitHub Issue...