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This is the main application script in the standard scaffolded application, as created by apic loopback.

var loopback = require('loopback');
var boot = require('loopback-boot');
var app = module.exports = loopback();
app.start = function() {
  // start the web server
  return app.listen(function() {
    app.emit('started');
    var baseUrl = app.get('url').replace(/\/$/, '');
    console.log('Web server listening at: %s', baseUrl);
    if (app.get('loopback-component-explorer')) {
      var explorerPath = app.get('loopback-component-explorer').mountPath;
      console.log('Browse your REST API at %s%s', baseUrl, explorerPath);
    }
  });
};
// Bootstrap the application, configure models, datasources and middleware.
// Sub-apps like REST API are mounted via boot scripts.
boot(app, __dirname, function(err) {
  if (err) throw err;
  // start the server if `$ node server.js`
  if (require.main === module)
    app.start();
});

1 - 3: Require LoopBack modules and set up standard objects loopback, app, and boot.

4: Start the web server.

7: Emit the ‘started’ event.

10 - 13: Start API Explorer.

18: Initialize (boot) the application.