NanoID Generator

How to use it

1. Set the ID length; 21 is the NanoID default and already comparable to a UUID in collision resistance.
2. Set how many IDs you need, from 1 to 500.
3. Click Generate. Each ID is drawn from the URL-safe alphabet A-Z, a-z, 0-9, dash and underscore.
4. Copy the list into your seed file, test fixtures or migration script.

Common use cases

• Database and API identifiers - short, URL-friendly keys for records that would rather not expose sequence numbers.
• Test fixtures - fill a staging dataset or a mock server with realistic-looking unique IDs.
• File and asset names - suffix uploads with a random tag to avoid name collisions.
• Short links and share tokens - mint unguessable slugs for private resources.

Why it stays private

The NanoID algorithm runs locally: randomness comes straight from crypto.getRandomValues, masked to the 64-character URL-safe alphabet. The generated IDs are never transmitted or logged, so they are safe to use for real resources.

FAQ

Q: Is this equivalent to the official NanoID library? A: It follows the same recipe: a 64-character URL-safe alphabet and random bytes from a cryptographic source. IDs of the same length have the same entropy and collision behavior as the reference implementation.

Q: NanoID or UUID? A: A 21-character NanoID carries roughly the same number of random bits as a UUID v4, but it is shorter and URL-safe without encoding. Choose UUIDs when a standard format or database-native type matters more than length.

Q: Do I need to check generated IDs for uniqueness? A: Within a batch the chance of a duplicate is negligible at these lengths. If your application inserts millions of records, keep a unique constraint in storage anyway, since that is the reliable guarantee.