app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var expressValidator = require('express-validator');
var session = require('express-session');
var mondo = require('mongodb');
var db = require('monk')('localhost/nodeblog');
var multer = require('multer');
var flash = require('connect-flash');


var indexRouter = require('./routes/index');
var posts = require('./routes/posts');
var categories = require('./routes/categories');

var app = express();

app.locals.moment= require('moment');
app.locals.truncateText = function(text, length){
  return text.substring(0, length);
}

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

//Handle File uploads & Multer data
var multr = multer({dest: './public/images/uploads'});

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(session({
  secret: 'secret',
  saveUninitialized: true,
  resave: true
}));


app.use(expressValidator({
  errorFormatter: function(param, msg, value){
    var namespace = param.split('.'),
        root = namespace.shift(),
        formParam = root;

    while(namespace.length){
      formParam += '[' + namespace.shift() + ']';
    }
    return{
      param: formParam,
      msg: msg,
      value: value
    };
  }
}));

//connect-flash
app.use(flash());
app.use(function(req, res, next){
  res.locals.messages = require('express-messages')(req, res);
  next();
});

//make our db to any route
app.use(function(req, res, next){
  req.db = db;
  next();
});

app.use('/', indexRouter);
app.use('/posts', posts);
app.use('/categories', categories);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;