Using pm Object and JavaScript in Scripts
What Is the pm Object?
The pm object is Postman's built-in JavaScript API, available in both pre-request scripts and tests. It gives scripts access to the current request, response, variables, and environment.
Common pm Methods
| Method | Purpose |
|---|---|
| pm.environment.set() | Set an environment variable |
| pm.environment.get() | Read an environment variable |
| pm.request | Access or modify the outgoing request |
| pm.response | Access the response data |
| pm.test() | Define a named test assertion |
Writing Basic JavaScript
Since scripts run in a standard JavaScript sandbox, ordinary JavaScript - loops, conditionals, functions - works alongside the pm object, giving full control over request setup and response handling.
With the pm object in hand, you're ready to start writing real tests and assertions against your API responses.
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