CORS y Express

.env

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+PORT=3005 # default port to listen
+DB_CONNECTION_STRING=mongodb+srv://Richard_Vargas:Dq7v9YIsMueuJeAy@cluster0.q00gh.mongodb.net/HospitalDB # default mongo connection string

.gitignore

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+node_modules/

README.md

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+# Hospital MEAN Backend
+
+Recuerda ejecutar npm install para instalar las dependecias
+Y para iniciar el servidor ejecuta npm run start:dev

database/config.js

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+const mongoose = require('mongoose');
+require('dotenv').config();
+
+const dbConnection = async () => {
+    try {
+        await mongoose.connect(process.env.DB_CONNECTION_STRING, {
+
+        });
+        console.log('Connection succsessful');
+    } catch (error) {
+        console.error(error);
+        throw new Error('Error trying to connect');
+    }
+}
+
+module.exports = {
+    dbConnection
+};

index.js

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+require('dotenv').config(); // import dotenv
+
+const express = require('express'); // import express
+const cors = require('cors'); // import cors
+
+const { dbConnection } = require('./database/config'); // import dbConnection from config.js
+
+// Crear server de express
+const app = express(); // create an instance of express
+
+app.use(cors()); // enable cors
+
+// Base de datos
+dbConnection(); // connect to database
+
+// Rutas
+app.get('/', (req, res) => {
+    res.json({
+        ok: true,
+        mensaje: 'Petición realizada correctamente'
+    });
+});
+
+app.listen(process.env.PORT, () => {
+    console.log('listening on port' + process.env.PORT);    // listen process.env.PORT
+});
+
+
+// username = 'Richard_Vargas';
+// password = 'Dq7v9YIsMueuJeAy';