How can I get users email (and additional data) from the rest API?

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To add the user’s email address in the REST API response, register an additional field to the user object and add the email address:

register_rest_field(
    'user',
    'user_email',
    [
        'get_callback' => static function (array $user): string {
            return get_userdata($user['id'])->user_email;
        },
    ]
);

Please note, however, that this is strongly discouraged because anyone can then see the email addresses if the code is running on a publicly accessible website.

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