UUID/ULID/NanoID Generator
Recognizes a supplied UUID or ULID and reports its format; otherwise uses Web Crypto to generate UUIDv4 by default, UUIDv7 for v7 requests, or a random ULID/Nano ID for those modes. Generated ULIDs are not monotonic.
About this uuid/ulid/nanoid generator
Recognizes a supplied UUID or ULID and reports its format; otherwise uses Web Crypto to generate UUIDv4 by default, UUIDv7 for v7 requests, or a random ULID/Nano ID for those modes. Generated ULIDs are not monotonic Transforms and validates developer data structures locally, preventing confidential payload exposure during data wrangling.
Syntax parsing & data transformation logic
Provides standards-compliant encoding, decoding, and unique identifier generation covering POSIX Unix epoch timestamps, ISO 8601 / RFC 3339 extended calendar formats, RFC 4122 Universally Unique Identifiers (UUIDv4 pseudorandom, UUIDv7 millisecond time-ordered), ULID (Universally Unique Lexicographically Sortable Identifier), and W3C HTML5 entity character references. Timestamp conversions utilize high-precision integer arithmetic to prevent 32-bit Year 2038 signed rollover bugs, while UUID generation taps directly into the browser's cryptographically secure pseudo-random number generator (CSPRNG, crypto.getRandomValues).
Worked conversion & output example
Scenario: Validate one canonical version-four UUID.
Sample input:
Processing: Match the canonical UUID expression and extract version and variant.
Illustrative output:
Syntax constraints & input size limits
Validation is syntax/variant only, not uniqueness or provenance. Generated ULIDs use the current millisecond and random characters but are not monotonic; NanoID uses the local fixed alphabet and size 21. Generation needs browser crypto.
Data conversions and formatting in UUID/ULID/NanoID Generator reflect standard structured syntax. Verify parsed outputs against your target runtime before deployment.
Local client execution boundary
Data parsing and transformations in UUID/ULID/NanoID Generator execute in the local browser tab without remote data transmission.
Data format specifications & language standards
Data interchange formats and language grammar specifications:
- RFC 9562 (Universally Unique IDentifiers - UUIDs)
- RFC 4122 (Universally Unique IDentifier URN Namespace)
UUID/ULID/NanoID Generator verification · Audit standards
How to use it
- Enter a UUID or ULID to inspect, or type a generation keyword such as `ulid`, `nanoid` or `v7`.
- Validate a matching identifier, or use browser randomness to generate the selected format.
- Read JSON validation details or the generated identifier.
Frequently asked questions
What does UUID Generator recognize from supplied text?+
A UUID-shaped input is checked against hexadecimal 8-4-4-4-12 groups, version 1–8 and RFC variant bits. A supplied UUIDv4 returns structured validation JSON instead of being replaced with a new random value.
What result does a supplied UUIDv4 produce?+
`550e8400-e29b-41d4-a716-446655440000` yields `valid: true` and `format: UUIDv4`. This is a deterministic validation path, not evidence about random generation quality.
Which identifier formats are limited?+
It recognizes UUID-shaped values for versions 1–8 and a 26-character Crockford-base32 ULID. Malformed hyphens, opaque IDs, and external lookup are outside these pattern checks; recognition does not establish issuer or authenticity.
When does it generate a new identifier?+
Text containing ULID, NanoID, v7 or time-ordered selects local generation; otherwise it uses crypto.randomUUID when available. Newly generated values are intentionally different on separate runs.