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About UUID Generator Online
This tool generates UUID v4 values using Node's built-in `crypto.randomUUID()`. Each UUID is a 128-bit cryptographically random identifier formatted as 32 hexadecimal characters in the xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx pattern defined by RFC 4122.
UUID v4 identifiers are globally unique with overwhelming statistical probability, making them suitable for primary keys in distributed databases, correlation IDs in logging systems, session tokens, and any context requiring a non-sequential, collision-resistant identifier.
You can generate 1 to 50 UUIDs per run and choose the output format: one per line, comma-separated, or as a JSON array.
How to use this tool
How to generate UUIDs
Set how many UUIDs you need
Use the "How many" field to specify the count — from 1 to 50 per run. The default is 5. Run the tool multiple times if you need more than 50.
Choose a copy-friendly format
Select how the UUIDs should be joined for quick pasting: One per line (the default, for most editors and scripts), Comma-separated (for CSV or inline lists), or JSON array (for code that expects a JSON array literal).
Generate
Press Run. The tool generates RFC 4122 UUID v4 values using Node's built-in `crypto.randomUUID()`. Each UUID is cryptographically random — no two runs will produce the same value.
Copy and use
Click Copy to grab all UUIDs at once in the chosen format. Paste directly into your database migration, test fixture, environment variable, or configuration file. UUIDs are safe to use as primary keys, correlation IDs, session tokens, or anywhere you need a globally unique identifier.