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+--- Thread: [b]"How to Properly Send POST Data with curl? Need Help!"[/b] or [b]"What’s the Best Way to Use curl POST Data in (/thread-b-how-to-properly-send-post-data-with-curl-need-help-b-%0A%0Aor-%0A%0A-b-what%E2%80%99s-the-best-way-to-use-curl-post-data-in)
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[b]"How to Properly Send POST Data with curl? Need Help!"[/b] or [b]"What’s the Best Way to Use curl POST Data in - deepDartX99 - 15-02-2025
"Struggling with curl POST data – any tips or examples?"
Hey guys, I’ve been trying to send some curl post data to an API, but it’s just not working.
I’m using something like:
`curl -X POST https://example.com/api -d "key=value"`
But the server keeps rejecting it or not seeing the data. Am I missing something obvious?
Also, what’s the diff between `-d` and `--data-raw`? And when should I use `-H "Content-Type: application/json"`?
If anyone has a simple curl post data example that actually works, pls share!
Thanks in advance, my sanity is hanging by a thread here 😅
“” - webDrifterX - 06-03-2025
Hey! I had the same issue with curl post data last week. Turns out, the server was expecting JSON, but I was sending form-urlencoded. Try this:
`curl -X POST https://example.com/api -H "Content-Type: application/json" -d '{"key":"value"}'`
Also, `-d` is for form data, while `--data-raw` is for raw input (no extra processing). If you're sending JSON, always include the Content-Type header. Hope this helps!
“” - fastDrifter99 - 23-03-2025
omg, curl post data can be such a pain sometimes. 😫
Quick tip: if the server’s picky, try `--data-binary` instead of `-d`. Some APIs freak out if there’s any whitespace or formatting issues.
Also, Postman (https://www.postman.com/) is a lifesaver for testing APIs before jumping into curl. You can export the curl command from there too!
“” - shadowCircuitX - 26-03-2025
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.
“” - shadowRushX - 01-04-2025
Dude, I feel you. curl post data drove me nuts until I realized some servers need the `-L` flag (follow redirects) or `-k` (ignore SSL cert errors).
Also, `-v` is your best friend—it shows the full request/response so you can see where it’s failing.
Example:
`curl -v -X POST https://example.com/api -d "key=value"`
If you’re still stuck, paste the error here. Might be a server-side thing.
“” - maskedEscape99 - 02-04-2025
Pro tip: Use `curl --trace-ascii debug.txt` to dump everything to a file. Super handy for debugging curl post data issues.
Also, `-d` and `--data-raw` are *almost* the same, but `--data-raw` won’t interpret `@filename` as a file read. Stick with `-d` unless you need raw.
For JSON, always double-check your quotes—some shells eat them up.
“” - RapidConceal99 - 04-04-2025
If you’re on Windows, watch out for cmd vs. PowerShell quirks with curl post data. PowerShell hates single quotes for JSON, so use double quotes and escape them:
`curl.exe -X POST https://example.com/api -H "Content-Type: application/json" -d "{\"key\":\"value\"}"`
Or just use WSL/Linux. 😅
“” - fastDashX77 - 05-04-2025
Check out https://reqbin.com/ for testing curl post data live in your browser. It’s way easier than guessing in the terminal.
Also, `-d` is shorthand for `--data`, and yeah, headers matter *a lot*. Some APIs won’t even look at the body without the right Content-Type.
Here’s a foolproof JSON example:
```
curl -X POST https://example.com/api \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"key":"value"}'
```
“” - deepDartX99 - 05-04-2025
Yo, thanks everyone! 🙌 Tried the JSON example with headers and it *finally* worked. Turns out the API was super strict about Content-Type.
Quick follow-up: what if the API expects multipart/form-data? Tried `-F` but got a 400. Do I need extra headers for that?
Also, `-v` saved my life—no idea why I wasn’t using it before.
P.S. Postman is legit, gonna start there next time. 😅