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developer validator

MIME Type Validator

Validate MIME type strings before using them in headers or configs.

Results

Processing…
Status
Processing...
Details
Processing...

Rules & checks

Validates structure like type/subtype.

Runs locally; no network requests.

When to use it

  • Validate MIME types before setting Content-Type headers
  • Check uploads or API specs for correct media types
  • Normalize MIME values in config files

Tips

  • Match MIME type to actual file content to avoid client errors
  • Use charset when appropriate, e.g., text/html; charset=utf-8

Examples

Valid

  • application/json -> valid

Invalid

  • json -> invalid format

FAQs

Do you verify file contents?
No. This checks MIME string format only.
Are vendor types supported?
Yes, as long as they follow type/subtype syntax.

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Format-only; does not check server support.