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Auth0 Custom Domains — Configuring Custom Domains in Auth0

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about Auth0 Custom Domains. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Custom domains in Auth0 allow you to use your own domain for authentication endpoints, maintaining brand consistency.

# DNS configuration
# Type: CNAME
# Name: auth.example.com
# Value: YOUR_TENANT.auth0.com
# TTL: 300

# Auth0 custom domain configuration
curl -X POST https://{tenant}.auth0.com/api/v2/custom-domains \
  -H "Authorization: Bearer {token}" \
  -H "Content-Type: application/json" \
  -d '{
    "domain": "auth.example.com",
    "type": "auth0_managed_certs",
    "verification": {
      "methods": [
        { "name": "cname" }
      ]
    }
  }'
// SDK configuration with custom domain
const auth0 = new Auth0Client({
  domain: 'auth.example.com',  // Custom domain
  clientId: '{clientId}',
  authorizationParams: {
    redirect_uri: 'https://app.example.com/callback'
  }
});

Custom domains prevent third-party domain warnings in browsers and improve user trust during authentication.

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