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API Security Testing with Postman — API Reference

Tools

Tool Install Purpose
Newman npm install -g newman CLI runner for Postman collections
Postman Desktop app from postman.com Collection creation and manual testing

Newman CLI Commands

Command Description
newman run <collection.json> Execute collection
newman run <col> -e <env.json> Run with environment variables
newman run <col> --reporters cli,json Output in CLI and JSON format
newman run <col> --reporter-json-export out.json Export JSON results
newman run <col> --timeout-request 10000 10s request timeout
newman run <col> --delay-request 100 100ms delay between requests

Postman Test Script Functions

Function Description
pm.response.code HTTP response status code
pm.response.text() Response body as string
pm.response.json() Parsed JSON response
pm.expect(val).to.equal(x) Chai assertion
pm.expect(val).to.be.oneOf([]) Value in expected set
pm.expect(val).to.not.include(s) String not present
pm.environment.set(k, v) Set environment variable

Collection Schema (v2.1.0)

{
  "info": {"name": "...", "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"},
  "item": [{"name": "...", "request": {...}, "event": [{"listen": "test", "script": {...}}]}]
}

OWASP API Security Tests

Test Postman Assertion
BOLA/IDOR Expect 403/404 when accessing other user's resource
Auth bypass Expect 401 without valid token
Mass assignment Expect role field ignored in response
Injection Expect no 500 or stack trace in response
Data exposure Expect sensitive fields not in response

External References