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UUID generator
Generate one or multiple RFC 4122 version 4 UUIDs instantly — useful for database primary keys, API resource IDs, idempotency tokens, and test data.
Last reviewed
June 23, 2026
When seeding a database with test records, generate the required number of UUIDs upfront and assign them as primary keys. This lets you reference IDs predictably in related records before inserting any rows.
UUID v4 values are generated on the DevTool House server with Node.js crypto.randomUUID(), a cryptographically secure random number generator. Each value has 122 bits of random data and follows the 8-4-4-4-12 format specified by RFC 4122.
UUIDs are generated on DevTool House servers and returned to your browser. The generated values are not stored.
This tool generates UUID v4 (random). It does not generate UUID v1 (time-based), v3 (name-based MD5), or v5 (name-based SHA-1). For specialised UUID formats, use a language-specific UUID library.