MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]

Question

I'm new in nodeJS, started learning by following a trailer on youtube, everything goes well until I added the connect function if mongodb,

mongo.connect("mongodb://localhost:27017/mydb")

when I run my code on cmd (node start-app), get the following error,

MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]

Could someone explain to me which step I missed? my code :

var express = require("express");

var MongoClient = require('mongodb');

var url = "mongodb://localhost:27017/mydb";

var webService = require("./webService");

var server = express();

MongoClient.connect(url, function (err, db) {

    if (err) throw err;

    console.log("Database created!");

    db.close();

});

server.use(express.urlencoded({ extended: true }));

server.set('views', __dirname);

server.get('/', function (request, response) {

    response.sendFile(__dirname + '/MainPage.html');

});

server.get('/Sign', function (request, response) {

    response.render(__dirname + '/Sign.ejs');

});

server.post("/signUp", webService.signUp);

server.post("/createUser", webService.createUser);

server.listen(5500);

Answer 1

You have to first install the MongoDB database server first in your system and start it.

Use the below link to install MongoDB

https://docs.mongodb.com/manual/installation/