var words = []; for (var i = 0; i < Math.floor(Math.random() * 10) + 1; i++) { var word = ""; for (var j = 0; j < Math.floor(Math.random() * 20) + 1; j++) { var rand = Math.floor(Math.random() * 50) + 65; word += String.fromCharCode(rand); } words.push(word); } console.log(words);