node server.js not responding

I'm pretty new to node and I'm trying to create a simple server for my website but when I type in node server.js in command prompt nothing happens.

 `var http = require("http");  
 http.createServer(function(request, response) {
        response.writeHead(200, {"Content-Type": "text/plain"});
        response.write("It's alive!");
        response.end();
}).listen(3000);

This is what I see when I try to run my server.js File

I'm fairly certain my code is right, is there anything else I'm doing wrong? Thanks so much!