Create User Alias | Appizer API Documentation

Link multiple identifiers to the same user profile. After creating an alias, you can pass either ID in future API calls.

Endpoint

POST /users/aliases

Authentication

Required: Bearer token in Authorization header

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "user_id": "user_123",
  "alias_id": "legacy_999"
}

Parameters

Parameter	Type	Required	Description
`user_id`	string	Yes	ID of the existing user (you may instead supply primary_user_id UUID)
`alias_id`	string	Yes	New alias to associate with the user

Response

{
  "success": true,
  "alias_id": "legacy_999",
  "user_id": "user_123",
  "message": "Alias created"
}

Examples

JavaScript

const response = await fetch('https://api.appizer.com/v1/users/aliases', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    user_id: 'user_123',
    alias_id: 'legacy_999'
  })
});

const data = await response.json();
console.log(data);

Python

import requests

response = requests.post(
    'https://api.appizer.com/v1/users/aliases',
    headers={
        'Authorization': 'Bearer YOUR_API_KEY',
        'Content-Type': 'application/json'
    },
    json={
        'user_id': 'user_123',
        'alias_id': 'legacy_999'
    }
)

print(response.json())

cURL

curl -X POST https://api.appizer.com/v1/users/aliases \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "user_id": "user_123",
    "alias_id": "legacy_999"
  }'

Error Responses

Status Code	Description
400	Bad Request - Invalid request body or missing required fields
401	Unauthorized - Invalid or missing API key
404	Not Found - User ID does not exist
429	Too Many Requests - Rate limit exceeded
500	Internal Server Error - Something went wrong on our end

Use Cases

System Migration: Link old system IDs to new user IDs
Multi-Platform: Connect user IDs across different platforms (web, iOS, Android)
Third-Party Integration: Associate external service IDs with your users
Anonymous to Identified: Link anonymous session IDs to authenticated user IDs

Best Practices

Create aliases before the user_id changes in your system
Use aliases for backward compatibility during migrations
Document which IDs are aliases vs primary IDs in your system
Avoid creating circular alias relationships