422 Unprocessable Content
The request was well-formed but contains semantic errors that prevent processing.
What it means
HTTP 422 Unprocessable Content (originally Unprocessable Entity) means the server understood the request and its syntax was fine, but the content fails validation. Unlike 400, where the request itself is malformed, here the request parses correctly and is simply asking for something the data does not allow — a required field missing, a value out of range, a rule violated.
When it happens
It happens with API validation failures: submitting a form or JSON payload that parses fine but breaks a business rule, such as an email already in use or a date in the past where a future date is required.
How to fix it
- Read the validation errors in the response body and correct the offending fields.
- Make sure values meet the API's rules — required fields present, formats and ranges valid.
- For your own API, return clear, field-level error messages so clients know what to fix.
SEO impact
None directly. It is a validation response for API submissions and does not apply to indexable pages.
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Related codes
The server could not understand the request due to malformed syntax.
401 UnauthorizedAuthentication is required and has failed or not been provided.
402 Payment RequiredA largely reserved code intended for payment-gated access to a resource.
403 ForbiddenThe server understood the request but refuses to authorize it.
404 Not FoundThe server could not find the requested resource.
405 Method Not AllowedThe HTTP method used is not supported for the requested resource.
Related guides
A plain-English primer on HTTP status codes for SEOs: what the 2xx, 3xx, 4xx, and 5xx families mean, which ones affect rankings, and the codes worth knowing.
How to find and fix broken linksA practical walkthrough for finding broken links on your site, working out why each one breaks, and fixing them so visitors and crawlers stop hitting dead ends.