## isUUID() function [​](/content/docs/sdk/core.isuuid#isuuid-function "Direct link to isUUID(/index.html) function")

Returns true if the input string is a UUID.

**Signature:**

```typescript
export declare function isUUID(input: string): input is string;
```

## Parameters [​](/content/docs/sdk/core.isuuid#parameters "Direct link to Parameters"/index.html)

| Parameter | Type   | Description              |
|-----------|--------|--------------------------|
| input     | string | The input string.        |

**Returns:**

input is string

True if the input string matches the UUID format.

- [isUUID() function](/content/docs/sdk/core.isuuid#isuuid-function/index.html)
- [Parameters](/content/docs/sdk/core.isuuid#parameters/index.html)