Generate UUID v4, NanoID, HEX, and Base64URL random IDs Browser only up to 10,000 at a time.
Random identifiers are useful when uniqueness should not depend on a central sequence. UUID v4 provides a familiar fixed format, while NanoID lets you choose a compact length. The right choice depends on interoperability, database indexing, URL length, and the number of IDs you expect to generate.
UUID v4 uses the standard 36-character textual form with hyphens and is widely recognized by databases, APIs, and programming languages. Choose it when compatibility is more important than shaving characters from the identifier.
A shorter random ID is easier to display and use in URLs, but fewer random characters reduce the available identifier space. Keep a sufficiently long value for the expected volume and security context rather than choosing the shortest possible string.
Adding prefixes such as usr_ or ord_ can make IDs easier to recognize in logs. The prefix is descriptive text; uniqueness still comes from the random portion, and the ID should not be treated as a secret merely because it looks random.