Experiments: safely test code changes against live production traffic

Experiments let you compare versions of a step on live production traffic, judged on the execution data only Inngest can see. Call group.experiment("your-id", { variants, select }) with the implementations you want to compare and a selection strategy.

Key features:

• Judged on execution data — Variants are compared on timing, retries, failures, and cost Inngest records
• Durable selection — One variant runs per run, memoized as a step with weights that can be changed between deploys
• Strategies for the whole lifecycle — Ramp with experiment.weighted(), bucket users with experiment.bucket(), drive selection from feature flags with experiment.custom(), or lock winners with experiment.fixed()
• The function stays put — Evolve experiments by changing weights without rewriting the workflow

Available now in the Inngest TypeScript SDK (v4). Import experiment from inngest and call group.experiment() inside any function.