I have created a register form using javascript from which data is getting stored in the local storage,but I want to retrieve data from local storage for login purpose, following is my controller.js-

//Storing data from local storage into an array of objects

 var usersdata = JSON.parse( localStorage.getItem('key_users' ) );

function validatelogin()

{

    usersdata = JSON.parse( localStorage.getItem('key_users' ) );

    var usernameinput   = document.getElementById(username);

    var passwordinput   = document.getElementById(password);

    for(var p in userdata)

    {

      console.log(p+':'+userdata[p].username+'|'+userdata[p].email);

      if(usernameinput==userdata[p].username && passwordinput==userdata[p].password)

      {

         alert(Logged in successfully);

      }

    }

}

While trying to login, its giving error called 'userdata' is not defined..Please help with whats wrong in the code?