how to set the key value in localstorage using javascript code example

Example 1: get localstorage

function get(){
    var getJson = localStorage.getItem('key')
    if(getJson){
        arrayName = JSON.parse(getJson)
    }
}

Example 2: how to setItem and getItem in javascript in localStorage

function set(){
    var sendJSON = JSON.stringify(allMovie);
    localStorage.setItem('allMovie',sendJSON)
}

function get(){
    var getJSON = localStorage.getItem('allMovie');
    if (getJSON){
        allMovie = JSON.parse(getJSON)
    }

}