📄 ai-sdk/docs/reference/ai-sdk-core/create-id-generator
File: create-id-generator.md | Updated: 11/15/2025
Source: https://ai-sdk.dev/docs/reference/ai-sdk-core/create-id-generator
Menu
v5 (Latest)
AI SDK 5.x
Model Context Protocol (MCP) Tools
Experimental_StdioMCPTransport
Copy markdown
=============================================================================================================
Creates a customizable ID generator function. You can configure the alphabet, prefix, separator, and default size of the generated IDs.
import { createIdGenerator } from 'ai';
const generateCustomId = createIdGenerator({ prefix: 'user', separator: '_',});
const id = generateCustomId(); // Example: "user_1a2b3c4d5e6f7g8h"
import { createIdGenerator } from "ai"
Parameters
options:
object
Optional configuration object with the following properties:
options.alphabet:
string
The characters to use for generating the random part of the ID. Defaults to alphanumeric characters (0-9, A-Z, a-z).
options.prefix:
string
A string to prepend to all generated IDs. Defaults to none.
options.separator:
string
The character(s) to use between the prefix and the random part. Defaults to "-".
options.size:
number
The default length of the random part of the ID. Defaults to 16.
Returns
Returns a function that generates IDs based on the configured options.
Notes
- The generator uses non-secure random generation and should not be used for security-critical purposes.
- The separator character must not be part of the alphabet to ensure reliable prefix checking.
// Create a custom ID generator for user IDsconst generateUserId = createIdGenerator({ prefix: 'user', separator: '_', size: 8,});
// Generate IDsconst id1 = generateUserId(); // e.g., "user_1a2b3c4d"
On this page
Deploy and Scale AI Apps with Vercel.
Vercel delivers the infrastructure and developer experience you need to ship reliable AI-powered applications at scale.
Trusted by industry leaders:
- OpenAI
- Photoroom
