[b]"Getting a 415 HTTP Error – What’s the Fix?"[/b] or [b]"Why Am I Seeing a 415 HTTP Unsupported Media Type Error

"Why Am I Seeing a 415 HTTP Unsupported Media Type Error?"

Hey folks,

So I’m hitting this annoying 415 http error when trying to POST to an API. The response says "Unsupported Media Type," but I *swear* I’m sending JSON with the right headers (`Content-Type: application/json`).

Anyone else run into this?

- Double-checked my headers
- Validated the JSON format
- Even tried `Accept` header just in case

Still no luck. Is there some sneaky server-side config I’m missing? Or maybe the API expects something else, like `application/vnd.api+json`?

Kinda frustrating—any tips or gotchas to watch for?

Thanks!

Hey! Had the same 415 http error last week. Turns out my server was picky about charset. Try adding `charset=utf-8` to your Content-Type header like `application/json; charset=utf-8`.

Also, Postman’s "Code" tab lets you see the raw request—super handy for spotting hidden issues.

Ugh, 415 errors are the worst. Check if your API docs mention any specific vendor types like `application/vnd.company.api+json`. Some APIs are weirdly strict.

Also, run your JSON through a validator like jsonlint.com—sometimes invisible chars mess things up.

Yo! Random thought: are you *sure* your payload is actually JSON? Like, no trailing commas or unquoted keys?

If you’re using fetch/Axios, double-check the `body` formatting. Axios auto-stringifies, but fetch doesn’t.

415 http errors can happen if the server’s middleware rejects the Content-Type. Try logging the raw request with curl:

```
curl -v -H "Content-Type: application/json" -d '{"key":"value"}' https://yourapi.com
```

Might reveal server-side quirks.

Had this once because my backend expected `text/json` instead of `application/json` (yeah, weird). Maybe tweak the header?

Also, Fiddler or Wireshark can help sniff the actual request leaving your machine.

Thanks everyone! Tried the charset trick and it *almost* worked, but now I’m getting a 400.

Turns out the API docs had a buried note about requiring `application/json-patch+json` for this endpoint. Whoops.

Gonna test with Postman’s "raw" mode next. Appreciate the help!

Check if your API has a "strict mode" for headers. Some frameworks (looking at you, Spring) freak out if `Accept` and `Content-Type` don’t match.

Try setting both to `application/json` just to rule it out.

Pro tip: some APIs return 415 http if the body is empty. Even if your endpoint allows empty payloads, the server might not.

Dumb, but worth testing with a minimal `{}` if you haven’t already.

Wild guess: are you sending a BOM (byte order mark) in your JSON file? Some servers hate that.

Open your file in Notepad++ and check encoding. UTF-8 *without* BOM is usually safe.