HTTP 422 — Unprocessable Content
4xx Client Error
What it means
The request is syntactically valid but semantically wrong — well-formed JSON where a field fails validation.
What to do about it
Return a body listing which fields failed and why. Many APIs use 400 for this; 422 is more precise when the syntax itself was fine.
Where it sits
422 belongs to the 4xx family: The request contains something the server will not or cannot process. The fix is normally on the client side.
HTTP/1.1 422 Unprocessable ContentChecking it yourself
# see the status code and headers only
curl -sI https://example.com/path
# follow redirects and print each hop
curl -sIL -o /dev/null -w "%{http_code} %{url_effective}\n" https://example.com/path
# JavaScript
const r = await fetch(url);
console.log(r.status, r.statusText);