Create sample IDs
Generate IDs for JSON examples, mock records, and fixtures.
Free browser tool
UUID Generator
The UUID generator creates random UUID v4 identifiers using the browser's crypto API. UUIDs are useful for test data, fixtures, local identifiers, example payloads, and quick records that need unique-looking IDs.
Generated UUIDs are produced client-side and can be copied immediately. For production identifiers, use the ID strategy already established by your application or database.
UUID generator
Generate random UUID v4 values in the browser.
What this tool does
UUIDs are standardized identifiers designed to be unique across systems without coordination. Version 4 UUIDs are random, making them useful for examples, test data, local records, and temporary identifiers.
This generator uses the browser crypto API to create UUID v4 values locally. It is convenient for fixtures and examples, but production ID strategy should match the database, service, or architecture you are building.
Common use cases
Fill test payloads
Create unique-looking values without writing a script.
Prototype local data
Use UUIDs while sketching frontend state or temporary records.
Example before and after
The generated value follows the UUID v4 shape and can be copied into examples or tests.
Action
Generate one UUIDUUID v4 output
9f2b6b58-5f9d-4f83-9a30-4d8f84e5a2a1How to use
- Choose how many UUIDs to generate.
- Click Generate UUIDs.
- Copy the generated identifiers.
Common errors
Using UUIDs for order
Random UUIDs do not sort by creation time.
Assuming they hide information
UUIDs are identifiers, not access controls or secrets.
Mixing ID formats
Public APIs should be consistent about the identifier format they expose.
Why use this tool
Create IDs for test fixtures and examples.
Generate unique-looking values without a script.
Fill sample JSON payloads quickly.
Best practices
Use UUIDs consistently
Pick an ID format and document it for API consumers.
Keep secrets separate
Do not use an identifier as proof that a caller is authorized.
Generate locally for fixtures
Browser-generated UUIDs are handy for local examples and sample data.
Related tools
Related guides
What is a UUID
UUIDs are standardized identifiers that can be generated independently with a very low chance of collision.
SHA256 vs MD5
SHA-256 is a modern cryptographic hash. MD5 remains common in legacy checks but is broken for security uses.
HTTP status codes explained
HTTP status codes quickly tell you whether a request succeeded, redirected, failed client-side, or failed server-side.
FAQ
What version of UUID is generated?
The tool generates random UUID v4 values.
Are UUIDs guaranteed unique?
UUID v4 collisions are extremely unlikely, but no random system can promise mathematical impossibility.
Can I generate multiple UUIDs?
Yes. Choose a count and generate a list.
Are UUIDs generated locally?
The tool runs in your browser and does not require login, a database, or server-side processing.