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The Change Email script implements the defined function when a user’s email address or their email address verification status changes. We recommend naming this function changeEmail. The script is only used in a legacy authentication scenario, and is required if you want to update a user’s email address (and/or email address verification status) in Auth0 and your external database in the same operation. The Change Email script is not configurable through the . To manage this script, you must use the Auth0 Create a connection or Update a connection endpoint, or the Auth0 Deploy CLI.
If you manage a custom database connection’s Database Action Scripts through the Auth0 Dashboard, the Change Email script will be automatically deleted upon saving.To ensure that the Change Email script is not removed accidentally, use the Auth0 Management API or Auth0 Deploy CLI when managing the connection.If you manually change a user’s email in your custom database, you must patch the user separately; Auth0 will not automatically detect the change.

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ChangeEmail function

The changeEmail function should:
  • Update the user’s email address in the external database.
  • Return an error if the operation failed or an error occurred.

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Definition

The changeEmail function accepts four parameters and returns a callback function: 
changeEmail(email, newEmail, verified, callback): function
ParameterTypeDescription
emailStringUser’s current email address.
newEmailStringValue to be set as user’s new email address in external database.
verifiedBooleanEmail verification status of the new email address.
callbackFunctionUsed to pass error data through the pipeline.

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Example

This is a pseudo-JavaScript example of how you could implement the changeEmail function: 
function (email, newEmail, verified, callback) {
  // Prepare the API call
  let options = {
    url: "https://example.com/api/users",
    action: "PATCH",
    body: {
      email: email,
      new_email: newEmail,
      email_verified: verified
    }
  };

  // Call the API
  send(options, err => {
    // Return `false` value in callback if operation failed
    if (err && err.id == "FAIL_CHANGE_EMAIL") {
      return callback(null, false);
    } else if (err) {
      // Return error in callback if unspecified error occurred
      return callback(new Error("My custom error message."));
    }

    // Return `true` value in callback if operation succeeded
    return callback(null, true);
  });
}

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Callback function

The callback function accepts two parameters and returns a function.

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Definition

callback(error, operationResult): function
ParameterTypeRequiredDescription
errorObjectRequiredContains error data.
operationResultBooleanOptionalIndicates the result of the change email operation.

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Return a success

If the change email operation succeeded, return the callback function, and pass a null value as the error parameter and a true value as the operationResult parameter: 
return callback(null, true);

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Return a failure

If the change email operation failed, return the callback function, and pass a null value as the error parameter and a false value as the operationResult parameter: 
return callback(null, false);

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Return an error

If an error occurred, return the callback function, and pass relevant error information as the error parameter: 
return callback(new Error("My custom error message."));

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