Identify Users
There are two recommended options to uniquely identify your users:
By the
user_id
property. This is guaranteed to be unique (within a tenant) per user (such as{identity provider id}|{unique id in the provider}
orfacebook|1234567890
). A user may have the sameuser_id
property across multiple Auth0 tenants, but consistency is not guaranteed.By a natural key, like the
email
property. In this case, it is recommended that you enable email verification and only use this option with providers that require that users verify their emails.
If you use custom databases, you must return a unique user_id
property. If you have multiple custom databases and expect possible collisions between ids from different connections, you should use a prefix identifying the connection. For example:
function login (email, password, callback) {
var user = getUserFromDB(email);
var profile = {
user_id: 'MyConnection1|' + user.id,
email: user.email,
[...]
};
callback(null, profile);
}
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