Unable to run server with node - node.js

Question

I'm new to node js and programming. I have problems running the server. This is what I did
1) Install Express
sudo npm install -g express-generator
2) Install dependencies
cd . && sudo npm install
When I run in terminal:
node app.js OR node app
There is no response on whether the server is running and chrome says that no data is received when I route to localhost:3000. I later found out that the correct way was to run
npm start
instead, but I got this:
npm ERR! express#0.0.1 start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the express#0.0.1 start script.
npm ERR! This is most likely a problem with the express package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./bin/www
npm ERR! You can get their info via:
npm ERR! npm owner ls express
npm ERR! There is likely additional logging output above.
npm ERR! System Darwin 13.1.0
npm ERR! command "/opt/node/bin/node" "/opt/node/bin/npm" "start"
npm ERR! cwd /Users/apple/Documents/javascript/express
npm ERR! node -v v0.11.14-pre
npm ERR! npm -v 1.4.14
npm ERR! code ELIFECYCLE
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /Users/apple/Documents/javascript/express/npm-debug.log
npm ERR! not ok code 0
What's wrong?

Answer 1

What did you get in return when you run node app.js?
Also, make sure your app.js is inside the folder you are at.

Answer 2

Express generator does not generate an express for you, it only installs express tool to generate projects.
sudo npm install -g express-generator
Once express-generator is installed; issue express to generate the project for you;
$ express myapp
// generate myapp with initial express files
$ cd myapp && npm install
// now you run the app
$ ./bin/www
// or
$ npm start