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Postman
A place to poke an API by hand and see exactly what it sends back.
1. Learn it
- An API request is a URL, a method (GET/POST), headers, and sometimes a body.
- Headers usually carry the API key — that is how the other side knows it's you.
- The status code tells you the story: 200 fine, 401 wrong key, 404 wrong URL, 429 slow down, 500 their fault.
- Test a request here before writing code around it, so you know which half is broken.
Cost: Free tier.
2. Practice it
Simulated — nothing real happensRead the status code
Your weather call returns 401. Name the likely cause and the first thing you check.
3. Connect it
Real — your own account- 1Install Postman, or use the browser version, and send one real GET request.
MessyDev never signs you up, spends your money, or touches your accounts. You do that part.
4. Use it
Every time an API 'doesn't work' and you need to know whose fault it is.
Honest alternatives
There is no single correct stack. Any of these would be a reasonable choice instead.
- curl in a terminal
- Insomnia
- Your browser's network tab
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