Sample express.js routing

server.js

var express = require( 'express' ),
    body    = require( 'body-parser' ),
    env     = process.env;

App = express();

/**
 * Load up the App.locals as a reference carrying singleton superstar
 */
App.locals = {
  db: '...',
  models: {
    User: require( '...' )  
  }
}


/**
 * Ext. Middleware or custom route modifers
 */
App.use( body.json() );
App.use( function ( req, res, next ) { /*..*/ next() } );

/**
 * Depending on needs, sometimes these will separated out to another file for cleanliness
 */
App.use( '/', function ( req, res, next ) { 
  if ( !req.user ) {
    res.redirect( '/login' );
  }  
});

App.use( '/login', function ( req, res, next ) {
  res.render( 'login', { /* data */ } );
});

App.use( '/dist', express.static( __dirname + '/../public/dist' ) );

/**
 * API / Data oriented routes
 * 
 * Pass along a fresh router to keep middleware clean & separate, and let the App tag along too.
 */
var v1APIs = require( './routes/v1' )( express.Router(), App );
App.use( '/v1', v1APIs );

/**
 * Expected / Unexpected errors
 */
App.use( function ( req, res, next ) {
  res.status( 404 );
  
  if ( req.accepts( 'json' ) ){
    res.send( { /* ... */} );
  } else if ( res.accepts( 'html' ) ) {
    res.render( '404' );
  } else {
    res.send( 'Go back the way ya\' came, boy.' );
  }
});

App.use( function ( err, req, res, next ) {
  res.status( 500 );
  
  if ( req.accepts( 'json' ) ){
    if ( 'development' === env.NODE_ENV ) {
      /* Maybe holl'a'tcha boi that err.stack so they can help ya' debug */
    }
    res.send( { /* ... */} );
  } else if ( res.accepts( 'html' ) ) {
    res.render( '500' );
  } else {
    res.send( 'Go back the way ya\' came, boy.' );
  }
})

v1.js

module.exports = function ( router, App ) {
  
  var Users = App.locals.models.User,
      ok    = function ( data ) {
        this.status( 200 ).send( data );    
      },
      err   = function ( err ) {
        this.status( 500 ).send( err.message );
      };
  
  router.get( '/users/:id', function ( req, res, next ) {
    Users
      .where( 'id', req.params.id )
      .findOne()
      .then( ok.bind( res ), err.bind( res ) )
      .catch( err.bind( res ) );
  });
  
  
  return router;
}