SMRTR ProgrammingJul 8, 2026DZone

Building an Idempotent Job Queue in Node. js That Never Runs the Same Task Twice

SMRTR summary

Duplicate side effects—like double-charging customers—occur when workers crash before acknowledging completed jobs. Combining at-least-once delivery with idempotent processing, using PostgreSQL atomic inserts and expiring leases, safely prevents this in Node.js.

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