Request Scripting for Idempotent Writes in Postman

Postman Request Scripting Limits

The goal is to ensure a write operation executes only once, even if the Postman request is run multiple times.

Constraints and Uncertainty

Postman itself does not enforce API idempotency; this depends on backend design.

Given the available scripting capabilities, how can a pre-request script reliably prevent a duplicate write?

• What specific variable state must be checked across executions?
• Does Postman offer a built-in mechanism to track prior successful write events within a collection run?