THE BLOG
API testing, explained in plain English
Short guides to the parts of Postman you’ll use every week. Read one, then practise it in an exercise.
Testing
How business analysts can test a developer's API in Postman
A practical routine for checking an API change against its acceptance criteria yourself, without waiting for a developer to demo it.
6 Nov 2026 · 5 min readReadHTTP basics
HTTP status codes explained for API testers
What 200, 201, 400, 401, 403, 404 and 500 really mean, and how to tell whether the status code an API returns is the right one.
5 Nov 2026 · 5 min readReadRequests
Query parameters vs path parameters: what's the difference?
Learn to read any API URL: which part identifies the record, which part filters it, and how to set both in Postman's Params tab.
4 Nov 2026 · 3 min readReadAuthentication
Bearer tokens and API keys in Postman, explained
Why APIs ask for credentials, the difference between an API key and a bearer token, and how to send each one in Postman without copying it everywhere.
3 Nov 2026 · 3 min readRead