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Inngest · Pipe

singleton

Singleton functions prevent overlapping runs for the same key. Choose skip to keep the current run or cancel to replace it with the newest event.

Last updated 2 November 2026

Since: 3.39.0

Syntax

singleton: { key: "event.data.user_id", mode: "skip" }

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

Concurrency
Rate Limiting
Throttling
Debounce
Batching
Common Expression Language (CEL)

Source: Singleton Functions | One Run at a Time - Inngest Docs. Checked 2026-11-03.