UUID with Trailing Comma – Fix Copied CSV or List Values

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Show that a trailing delimiter is extra text outside canonical UUID syntax.

37 chars · 1 line

Needs attention

Invalid UUID format

UUID copy and paste validation

Why does a UUID with a trailing comma fail?

A comma copied from CSV, a list literal, or a log line is not part of the UUID. Even when the preceding 36 characters form a valid identifier, the extra delimiter makes the full input fail VetaTool's canonical format check. This tool is free to use. No account or payment is required.

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What you can do here

  • Canonical 8-4-4-4-12 UUID validation
  • UUID version inspection
  • RFC 4122 variant checking
  • Nil UUID recognition
  • Uppercase hexadecimal support
  • Browser-local validation

Steps

  1. Paste the value exactly as copied from the list or record.
  2. Remove the trailing comma or other delimiter.
  3. Validate the bare UUID text again.

The validator checks the entire trimmed string

VetaTool does not split CSV fields or list syntax before UUID inspection. After trimming whitespace, every remaining character must belong to canonical UUID text.

A trailing comma therefore fails at the format layer before version or variant bits are inspected.

Trailing comma example

The UUID itself is canonical, but the comma is extra syntax.

UUID input

550e8400-e29b-41d4-a716-446655440000,

Validation result

Invalid UUID format

Common questions

Frequently asked questions

Will surrounding whitespace be removed even if a comma remains?

Yes. Whitespace is trimmed, but punctuation such as a comma remains and still causes format validation to fail.

Should I parse CSV before validating UUID columns?

Yes. Parse the record into fields first, then validate the UUID field without its CSV delimiters.

Recommended next steps

Quoted UUID StringRemove surrounding quote characters copied from JSON or source code before UUID validation.UUID with Internal SpaceSee why whitespace inside the canonical UUID characters breaks format validation.UUID Generator & Validator OnlineGenerate UUID v4 batches or validate canonical UUID format, version, and variant locally.

Debugging a specific UUID issue? Browse UUID troubleshooting.