UUID Regex Javascript Validator

What is UUID Regex?

In JavaScript, UUIDs (Universally Unique Identifiers) are often used to uniquely identify objects, records, or resources across distributed systems. Validating the format of a UUID ensures your application is working with properly structured data.

UUIDs typically follow this format:

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

Where:

• x is any hexadecimal digit

• M indicates the UUID version (usually 1 to 5)

• N indicates the UUID variant (typically 8, 9, A, or B)

UUID Regex Pattern

Here’s a standard regex pattern for validating UUIDs:

^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-5][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$

This pattern ensures the UUID:

• Is 36 characters long

• Contains hyphens in the correct positions

• Matches version and variant formatting rules

JavaScript Example – UUID Validation

function isValidUUID(uuid) {
  const uuidRegex = /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-5][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$/;
  return uuidRegex.test(uuid);
}

const uuid1 = "f47ac10b-58cc-4372-a567-0e02b2c3d479";
console.log(`Valid UUID? ${isValidUUID(uuid1)}`); // true

Use the JavaScript Regex Tester to tweak or build your own custom UUID regex variations.

Use Cases for UUID Validation

• Database Entries: Ensuring that primary keys or unique identifiers are properly formatted.

• API Responses: Validating UUIDs in tokens, headers, or payloads.

• Form Inputs: Preventing malformed UUIDs in user or admin-submitted data.

• Client-Side Checks: Lightweight validation before sending data to servers.

  
  

For related validation needs, explore the URL Regex JavaScript Validator for links or the IP Address Regex JavaScript Validator for network values.

Pro Tips for Using UUID Regex

• Always validate on both frontend and backend for security and data consistency.

• UUIDs are case-insensitive. The regex accepts both upper and lower case hex digits.

• Combine UUID validation with tools like Numbers Regex JavaScript Validator or Credit Card Regex JavaScript Validator to build full form validation flows.

• Be cautious of leading/trailing whitespaces — trim inputs before testing.

• UUIDs are not just for databases! Use them in session IDs, event logs, or any unique reference scenario.

Combine With These Tools

• JavaScript Regex Tester: Live test and debug your UUID patterns.

• Credit Card Regex JavaScript Validator: Build secure validation logic for payment forms.

• IP Address Regex JavaScript Validator: Useful for validating related networking fields.

• GUID Regex JavaScript Validator: For validating other types of unique identifiers.

• Date Regex JavaScript Validator: Validate timestamps or date-stamped logs together with UUIDs.