Usé mangosta para conectar mi base de datos a mi aplicación.

Recibí este error inesperado.

Mi app.js se ve así

 const express = require('express'); const mongoose = require('mongoose'); const authRoutes = require('./routes/authRoutes'); const cookieParser = require('cookie-parser'); const { requireAuth, checkUser } = require('./middleware/authMiddleware'); const run = require('./admin/connection'); const app = express(); // middleware app.use(express.static('public')); app.use(express.json()); app.use(cookieParser()); const {default : AdminBro} = require('admin-bro'); const buildAdminRouter = require('./admin/admin.router'); const options = require('./admin/admin.options'); const port = 3000; const url = 'mongodb://localhost:27017/dbName'; let mongooseDb; const databaseConnect = async () => { mongooseDb = await mongoose.connect(url, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex:true }) .then((result) => app.listen(3000)) .catch((err) => console.log(err)); const db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error:')); db.once('open', function() { console.log("we are connected to database"); }); const admin = new AdminBro(options) const router = buildAdminRouter(admin); app.use(admin.options.rootPath, router); }; databaseConnect();

Ya instalé la base de datos mongodb.

Ya encontré una pregunta similar en stackoverflow pero esas respuestas no resolvieron mi problema. Cualquier ayuda será apreciada. Gracias