UUID vs Random String
Choose between UUIDs and random strings for test data, identifiers, API keys, and database records.
Use UUIDs for standardized identifiers
UUIDs have a recognizable format and are convenient for database rows, event IDs, API request IDs, fixtures, import records, and systems that already expect a UUID-shaped value.
Use random strings for flexible formats
A random string lets you choose length and allowed characters, which is useful for coupon-like test codes, labels, mock invite codes, file suffixes, and custom fixture values. A string is not automatically an API credential.
Use API-key-shaped tokens only for development examples
When a demo or fixture needs a developer-token shape, use the API key generator with a clear prefix and non-production context. Real API keys still need backend validation, secure storage, rotation, and revocation.
Separate identifiers from secrets
Neither an identifier nor an example token should be exposed carelessly. Production secrets require a secure generation, storage, rotation, and validation design outside a static browser utility.
Recommended tools
UUID Generator OnlineRandom String GeneratorAPI Key Generator
FAQ
Are UUIDs secret?
No. UUIDs identify records; they should not be treated as passwords or API keys.
Can a random string replace a UUID?
Only if the receiving system accepts that format and you handle uniqueness appropriately.
What should I use for test API tokens?
Use a clearly non-production token format and never copy real credentials into fixtures.
When should I choose a UUID?
Choose a UUID when another system, database, or API expects the standard UUID format.