config for hosted login page

Using the Hosted Login Page, only some authorized parameters are permitted, which will be populated in the config.extraParams. You can check the full list of permitted parameters [here] (auth0.js/parameters-whitelist.js at 72bfbbb5d5e08cc5ad60eb387bd18c3824786627 · auth0/auth0.js · GitHub).

As an example, to have a prefill value, you’d have to enter a login_hint value in your authorize request as:

<script src=""></script>
var webAuth = new auth0.WebAuth({ (...)});
  login_hint: ""

In the hosted login page, the value is extracted from the config.extraParams:

var loginHint = config.extraParams.login_hint;

And finally put into the prefill value of Lock:

var lock = new Auth0Lock(config.clientID, config.auth0Domain, {
  prefill: loginHint ? { email: loginHint, username: loginHint } : null,

You can read more about the parameters on the /authorize endpoint here: Auth0 Universal Login

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