$.ajax( {
    url: Slug_API_Settings.root + ‘wp/v2/users/’,
    method: ‘POST’,
    beforeSend: function ( xhr ) {
        xhr.setRequestHeader( ‘X-WP-Nonce’, Slug_API_Settings.nonce );
    },
    data:{
        email: ‘someone@somewhere.net’,
        username: ‘someone’,
        password: Math.random().toString(36).substring(7)
    }
    })
    .done( function ( response ) {
        console.log( response );
     })