localStorage

local_storage.js

localStorage.clear(); //clears all data from localStorage

localStorage.setItem('name', 'john'); //set name to john
localStorage.setItem('user_id', '124242'); //set user_id to 124242


var n = localStorage.getItem('name'); //returns name and set to variable n;
var u = localStorage.getItem('user_id'); //returns 124242 and set to variable u;

console.log(n) //john
console.log(u) //124242

var myArray = [1,2,3,4,5]; //create an array
var myArrayString = JSON.stringify(myArray); //convert array to string

localStorage.setItem('myArray', myArrayString); //set the string representation of the array to myArray

var arr = localStorage.getItem('myArray') //return string representation of the array
typeof arr; //returns string
arr = JSON.parse(arr); //conver string to object

typeof arr //returns object