How to Properly Send POST Data with curl? Need Help! or What’s the Best Way to Use curl POST Data in

For curl post data, the Content-Type header is *everything*. If you don’t specify it, the server might just ignore your payload.

Here’s a working example for JSON:
```
curl -X POST https://example.com/api \
-H "Content-Type: application/json" \
-d '{"key":"value"}'
```

And for form data, use:
```
curl -X POST https://example.com/api \
-H "Content-Type: application/x-www-form-urlencoded" \
-d "key=value"
```

The server’s docs should tell you which one it expects.