Hi, Shanestrackejr! Don’t be stressful. I am here to help you!!!

The cause:

The server cannot connect to the MongoDB because your MongoDB Service is not started.

Solution:

To solve this error, you have to activate MongoDB Service. You can do as the following:

sudo service mongod start

At the time Service is started, the Mongo Shell is also activated:

[email protected]:~/workspace/nodejs/mongodb$ mongo
MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9

MongoDB records the URL in the terminal when Mongo Shell is launched, looks like the base of URL below:

connecting to: mongodb://127.0.0.1:27017

Finally, let’s check carefully whether you provide the similar base URL or the same Port and IP for your Node.js Application or not by doing:

// URL at which MongoDB service is working
var url = "mongodb://localhost:27017";

// A Client to MongoDB
var MongoClient = require('mongodb').MongoClient;

// Connect to MongoDB Service
MongoClient.connect(url, function(err, db) {
if (err) throw err;
console.log("Connected to MongoDB!");
db.close();
});