How to Retrieve Username with Auth0-spa-js

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username isn’t a standard OIDC claim (section 5.1 Final: OpenID Connect Core 1.0 incorporating errata set 1) so I believe it should be added via Rule to the ID token as custom claim.

function (user, context, callback) { 
  context.idToken['https://mynamespace/username'] = user.username; 
  callback(null, user, context);  
}

Alternatively, set it as preferred_username in a pre-user-registration hook, which is a standard claim, and request the preferred_username scope when doing the authorization request.

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