Cara menggunakan mongodb localhost 27017

I can't connect to the local mongodb server running on localhost:27017 from my express application. I'm pretty sure that I haven't done anything wrong in the code I wrote as I've copied it from a tutorial. The code worked fine on that tutorial. And I've also made sure that the mongodb service is running. I've already created a database called "blog" from mongosh shell and inserted some data to a collection called "authors" on it. I've also installed the MongoDB Node Driver using "npm install mongodb" command. But whenever I try to run npm start, this error shows up and I can't run my application thereafter.

E:\My-Coding-Projects\Current Projects\28-web-100-nodejs-mongodb-project\node_modules\mongodb\lib\sdam\topology.js:306
                const timeoutError = new error_1.MongoServerSelectionError(`Server selection timed out after ${serverSelectionTimeoutMS} ms`, this.description);
                                     ^

MongoServerSelectionError: connect ECONNREFUSED ::1:27017
    at Timeout._onTimeout (E:\My-Coding-Projects\Current Projects\28-web-100-nodejs-mongodb-project\node_modules\mongodb\lib\sdam\topology.js:306:38)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        _hostAddress: HostAddress { isIPv6: false, host: 'localhost', port: 27017 },
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 195900556,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (E:\My-Coding-Projects\Current Projects\28-web-100-nodejs-mongodb-project\node_modules\mongodb\lib\cmap\connect.js:382:20)
            at Socket. (E:\My-Coding-Projects\Current Projects\28-web-100-nodejs-mongodb-project\node_modules\mongodb\lib\cmap\connect.js:302:22)
            at Object.onceWrapper (node:events:642:26)
            at Socket.emit (node:events:527:28)
            at emitErrorNT (node:internal/streams/destroy:151:8)
            at emitErrorCloseNT (node:internal/streams/destroy:116:3)
            at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
          [Symbol(errorLabels)]: Set(0) {}
        }
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  },
  code: undefined,
  [Symbol(errorLabels)]: Set(0) {}
}

Node.js v18.2.0
[nodemon] app crashed - waiting for file changes before starting...

This is the code I wrote on database.js to create the connection to the local mongodb server.

const mongodb = require("mongodb");

const MongoClient = mongodb.MongoClient;

let database;

async function connect() {
  const client = await MongoClient.connect("mongodb://localhost:27017");
  database = client.db("blog");
}

function getDb() {
  if (!database) {
    throw { message: "Database connection not established!" };
  }
  return database;
}

module.exports = {
  connectToDatabase: connect,
  getDb: getDb,
};

This is the code I wrote on app.js to connect the database to it and run the application.

const path = require("path");

const express = require("express");

const blogRoutes = require("./routes/blog");
const db = require("./data/database");

const app = express();

app.set("view engine", "ejs");
app.set("views", path.join(__dirname, "views"));

app.use(express.urlencoded({ extended: true }));
app.use(express.static("public"));

app.use(blogRoutes);

app.use(function (error, req, res, next) {
  console.log(error);
  res.status(500).render("500");
});

db.connectToDatabase().then(function () {
  app.listen(3000);
});

I always use MongoDB as a database when I work on an app. And I like to connect to a database on my computer because it speeds up dev and test-related work.

Today, I want to share how to create and connect to a local MongoDB Database.

Installing MongoDB

You need to install MongoDB on your computer before you can connect to it. You can install MongoDB by following these instructions (Mac and Windows).

Once you have completed the installation process, try typing

mongod

mongo --version

Starting MongoDB

You can start MongoDB on your computer with the

mongod

mongod

Keep the

mongod

Brief overview of how MongoDB works

MongoDB lets you store things (called documents) inside databases. Each database contains multiple collections.

To make it easier to understand, you can think of MongoDB as a building. It contains many rooms.

Each room is a database. Each database is responsible for storing information about one application. You can store as much information as you want.

You have an unlimited supply of boxes in each room. Each box is a collection. Each collection can only contain one type of data.

For example, one collection can be used for books, one collection for users, one collection for toys, and so on.

Adding items to a database

One way to add items to a MongoDB database is through the Mongo Shell. To open up the Mongo Shell, you open another command line window and run

mongo

mongo

Note: Make sure you keep the

mongod

mongod

First, we need a database to work with. You can see the currently selected database with the

mongo

mongo

> db

Note: The

mongo

mongo

For this article, we’ll create a database called

mongo

mongo

> use game-of-thrones

We’re going to add a character into the

mongo

> db

To add an item to a collection, you can pass a JavaScript object into

> db

db.characters.insertOne({ name: 'Jon Snow' })

Let’s add one character into the database before we continue.

db.characters.insertOne({ name: 'Arya Stark' })

You can see the characters we’ve added by using the

> db

> db

db.characters.find()

This is all you need to know about the Mongo Shell for now.

Accessing MongoDB with MongoDB Compass

MongoDB Compass gives you another way to access MongoDB. It’s an app that makes checking (and editing) databases easier if you’re not a fan of the command line.

To use MongoDB Compass, you have to install it first. You can download and install MongoDB Compass from the this page.

When you open MongoDB Compass, you’ll see a screen that looks like this:

To connect to your local MongoDB, you set

> db

> db

> db

> db

Press connect, and you should see the databases in your local MongoDB. Here, you should be able to see

mongo

If you click on

mongo

> db

And if you click on

> db

This is how you can use MongoDB Compass to connect to a MongoDB that’s running on your own computer.

Connecting to MongoDB with a Node server

When we build applications, we connect to MongoDB through our applications (not through Mongo Shell nor MongoDB Compass).

To connect to MongoDB, we need to use the mongodb package. Alternatively, you can also use Mongoose.

(By the way, I prefer using Mongoose over the MongoDB native driver. I’ll share why in a future article).

Connecting with MongoDB native driver

First you have to install and require the mongodb package.

npm install mongodb --save

const MongoClient = require('mongodb').MongoClient

You can connect to your local MongoDB with this url:

mongod

With the Mongo Client, you need to specify the database you’re using after you connect to MongoDB. Here’s what it looks like:

mongod

Connecting with Mongoose

To connect with Mongoose, you need to download and require

> use game-of-thrones

mongod

mongod

When you use Mongoose, the connection

> use game-of-thrones

mongod

You can connect to MongoDB with the

> use game-of-thrones

mongod

Here’s how you can check whether the connection succeeds.

mongod

If you enjoyed this article, please support me by sharing this article Twitter or buying me a coffee 😉. If you spot a typo, I’d appreciate if you can correct it on GitHub. Thank you!

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