new LoopBackApplication()
The `App` object represents a Loopback application.
The App object extends [Express](http://expressjs.com/api.html#express) and
supports Express middleware. See
[Express documentation](http://expressjs.com/) for details.
```js
var loopback = require('loopback');
var app = loopback();
app.get('/', function(req, res){
res.send('hello world');
});
app.listen(3000);
```
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