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At this time, Auth0’s active development efforts are focused on Universal Login, and Classic Login no longer receives updates. To customize your login pages, Auth0 recommends Advanced Customizations for Universal Login.
You can customize the error messages that will be displayed in certain situations by providing a languageDictionary option. A full listing of available languageDictionary fields to customize can be found in the GitHub repository’s English Dictionary file for Lock. Below is an example of some customized error messages:

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Custom errors in Rules

If you are returning custom error codes from a rule or a custom database script, you can handle custom errors:
  • In your application’s redirect URL by reading the error and error_mesage query string parameters.
  • By redirecting the user back to your hosted pages with a custom error message and displaying the message with a flash message.

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