How to Properly POST JSON Data Using cURL? or What’s the Correct Way to POST JSON with cURL?

You might wanna check if the server’s returning errors. Add `-v` to your curl command to see the full request/response.

```bash
curl -v -H "Content-Type: application/json" -d '{"key":"value"}' http://example.com/api
```

Sometimes the server’s error message tells you exactly what’s wrong.