Invalid UUID Format
A valid UUID (v4 or other) is 32 hexadecimal characters in the form 8-4-4-4-12 with optional hyphens. Wrong length, non-hex characters, or bad structure cause validation errors.
Common causes
- Copy-paste error or truncation (missing characters).
- Using spaces or wrong separators instead of hyphens.
- Non-hex characters (e.g. letter G) in the string.
How to fix
- Use a UUID validator to check format and get the exact error.
- Ensure 32 hex digits; hyphens in positions 9, 14, 19, 24 are optional but standard.
- Generate a new UUID with a proper generator if the value is not fixed.
FAQ
- What is the correct UUID format?
- 8-4-4-4-12 hex digits, e.g. 550e8400-e29b-41d4-a716-446655440000. Lowercase or uppercase hex is fine.
- Does UUID validation check version?
- Format validators check structure; version/variant are in specific nibbles (e.g. v4 has version 4 in the 13th character).
Fix it now
Try in validator (prefill this example)