UUID Validator Online

Check whether a UUID string is valid before storing it in a database, passing it to an API or using it in application logic.

Tool

What is a UUID validator?

A UUID validator checks whether a string matches the expected format of a Universally Unique Identifier (UUID). This helps developers verify identifiers when working with APIs, databases or distributed systems.

Common use cases

Use this tool to validate incoming API parameters, sanity-check database IDs, test user input or verify UUID samples used in docs and fixtures.

How to use this tool

1. Enter the UUID you want to validate.
2. Click the "Validate" button.
3. The tool will indicate whether the UUID is valid.

Example

Valid UUID

550e8400-e29b-41d4-a716-446655440000

Invalid UUID

12345-invalid-uuid

Tip

Validating UUIDs can help prevent errors when storing identifiers or sending data between systems that rely on unique IDs.

FAQ

Does this validator only support UUID v4?
No. It checks the general UUID format and can help verify common UUID versions such as v1, v3, v4 and v5.

Can a UUID be formatted correctly but still be wrong for my app?
Yes. Format validation only checks whether the string looks like a UUID, not whether it exists in your system.

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