db.js

var mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/app');
    
var usrSchema = new mongoose.Schema({
  user: { type: String, required: true },
  password: { type: String, required: true },
  DLU: { type: Date }
});
    
exports.db = mongoose.connection;
exports.User = mongoose.model('user', userSchema);

find.js

var db = require('./db').db;
var User = require('./db').User;

User.find(function(err,docs){
    console.log(docs);
});