Conecto con base de datos mongodb

src/database.js

-const mongoose = require('mongoose');
-const url = 'mongodb://localhost:27017/Laboratorio02';
+const mongo = require('mongodb');
 
-mongoose.connect(url, { useUnifiedTopology: true, useNewUrlParser: true });
-const db = mongoose.connection;
+// Connection URL
+const url = "mongodb://localhost:27017";
+// Database Name
+const dbName = 'Laboratorio02';
+const userCollectionName = 'Users';
 
-const userSchema = new mongoose.Schema({
-    email: {
-      type: String,
-      required: true
-    }
-});
+// Agrega un usuario a la base de datos
+exports.addUser = (obj) => {
+  mongo.connect(url, {useNewUrlParser: true, useUnifiedTopology: true}, (err, client) => {
+      if(err) {
+        console.log(err);
+        process.exit(0);
+      }
+      console.log('Base de datos conectada!');
+      const db = client.db(dbName);
+      db.collection(userCollectionName).insertOne(obj, (err, res) => {
+        if (err) throw err;
+        console.log('Usuario agregado a la base de datos.');
+        client.close();
+      });
+  });
+}
 
-const commentSchema = new mongoose.Schema({
-    id: {
-      type: String,
-      required: true
-    },
-    user: {
-      type: String,
-      required: true
-    },
-    text: {
-      type: Date,
-      required: true,
-      default: ''
-    }
-});  
-
-db.on('error', (error) => console.error(error));
-db.once('open', () => {
-    console.log('Database created!');
-});
+// Obtiene un usuario de la base de datos
+exports.getUserById = (id) => {
+  mongo.connect(url, {useNewUrlParser: true, useUnifiedTopology: true}, (err, client) => {
+      if(err) {
+        console.log(err);
+        process.exit(0);
+      }
+      console.log('Base de datos conectada!');
+      const db = client.db(dbName);
+      db.collection(userCollectionName).findOne({"email": id}).toArray((err, result) => {console.log(result)});
+  });
+}
\ No newline at end of file

src/routes/user.js

 const express = require('express');
 const bodyParser = require('body-parser');
 const users = require('../models/User').users;
+const database = require('../database');
 
 const app = express();
 
@@ -51,6 +52,7 @@ router.post('/user', (req, res) => {
             if (req.body.email) {
                 const newUser = {email: req.body.email.toString(), comment: [] };
                 console.log(newUser);
+                database.addUser(newUser);
                 users.push(newUser);
                 res.json(users);
             } else {