I started setting up my first node app but it prompt me this

./app.js: line 1: syntax error near unexpected token `('
'/app.js: line 1: `var http = require("http");

my code is

var http = require("http");
http.createServer(function (req,res){
    res.writeHead(200, {'content-Type': 'text/plain'});
    res.end('Hello World\n');
}).listen(8080, 'localhost');
console.log("server runnig at 8080");