function makeid() { var text = ""; var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; for (var i = 0; i < 8; i++) text += possible.charAt(Math.floor(Math.random() * possible.length)); return text; } x ="{" for(var i=0; i<1000; i++){ x+= '"'+makeid()+'",'} x+="}";