Scripts and tests

Pre-request and post-response scripts run in a sandboxed JS VM (goja) with a Postman-compatible API:

// Pre-request
pm.environment.set('signed_at', Date.now());
pm.request.headers.add({ key: 'X-Signed-At', value: pm.environment.get('signed_at') });

// Post-response
pm.test('Status is 200', function () {
  pm.expect(pm.response.code).to.equal(200);
});
pm.test('Has user id', function () {
  pm.expect(pm.response.json()).to.have.property('id');
});

Available helpers

• pm.environment.set/get
• pm.request.headers.add/upsert
• pm.test(name, fn)
• pm.expect(value).to.equal/.to.have.status/.to.have.property/.to.include
• pm.response.code, pm.response.json(), pm.response.headers.get

Test results render inline below the response body with green/red badges.

Round-trip

Scripts are part of the saved-request shape — they round-trip through Postman v2.1 import and reverse export.