Guides

When to Use UUIDs Instead of Random Strings

UUIDs are useful when you want a standardized identifier that is easy to pass around between systems. They are not the only kind of unique value, but they are often the most interoperable.

Time and identifiers3 min read

Trình tạo UUIDChuỗi ngẫu nhiênBộ chuyển đổi Unix Time

What it is

UUIDs are useful when you want a standardized identifier that is easy to pass around between systems. They are not the only kind of unique value, but they are often the most interoperable.

When to use it

- Generating record IDs for apps and databases.
- Assigning identifiers before a database row is created.
- Creating values that are easier to recognize as IDs than ad hoc strings.

Common misunderstandings

- UUIDs are human-friendly by default.
- Any random string can replace a UUID in a system that expects one.
- UUIDs are secret just because they look random.

How to try it now

Open the UUID generator.
Create a new UUID.
Copy it into the record or config that needs an identifier.
Use the random string tool only if you do not need UUID formatting.

Example

Input

Generate a UUID

Output

550e8400-e29b-41d4-a716-446655440000

Notes

- UUIDs are for identification, not authentication.
- If another service expects a UUID format, keep the canonical hyphenated form.
- Random strings are better when format is irrelevant.

FAQ

Are UUIDs secure secrets?

No. They are identifiers, not credentials.

When should I prefer a random string?

Use it when the value is just a unique token and no UUID format is required.

Can UUIDs be generated offline?

Yes. That is one of their useful properties.