---
title: generateId
description: Generate a unique identifier (API Reference)
---

# `generateId()`

Generates a unique identifier. You can optionally provide the length of the ID.

This is the same id generator used by the AI SDK.

```ts
import { generateId } from 'ai';

const id = generateId();
```

## Import

<Snippet text={`import { generateId } from "ai"`} prompt={false} />

## API Signature

### Parameters

<PropertiesTable
  content={[
    {
      name: 'size',
      type: 'number',
      description:
        'The length of the generated ID. It defaults to 16. This parameter is deprecated and will be removed in the next major version.',
    },
  ]}
/>

### Returns

A string representing the generated ID.

## See also

- [`createIdGenerator()`](/docs/reference/ai-sdk-core/create-id-generator)