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Advanced Node.js Development
Advanced Node.js Development

Advanced Node.js Development: Master Node.js by building real-world applications

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Advanced Node.js Development

MongoDB, Mongoose, and REST APIs – Part 1

In this chapter, you're going to learn how to connect your Node applications to the MongoDB database you've been running on your local machine. This means that we'll be able to issue database commands right inside of our Node apps to do stuff like insert, update, delete, or read data. This is going to be critical if we're ever going to make that Todo REST API. When someone hits one of our API endpoints, we want to manipulate the database, whether it's reading all of the Todos or adding a new one. Before we can do any of that though, we have to learn the basics.

Connecting to MongoDB and writing data

To connect to our MongoDB database from inside of Node.js, we're going to be using an npm module created by the MongoDB team. It's called node-mongodb-native, but it includes all of the features you'll need to connect to and interact with your database. To get to it, we're going to Google node-mongodb-native:

The GitHub repo, which should be the first link, is the one we wantthe node-mongodb-native repositoryand if we scroll down, we can take a look at a few important links:

First up we have documentation, and we also have our api-docs; these are going to be critical as we start exploring the features that we have inside of this library. If we scroll down further on this page, we'll find a ton of examples on how to get started. We'll be going through a lot of this stuff in this chapter, but...

The ObjectId

Now that you have inserted some documents into your MongoDB collections, I want to take a moment to talk about the _id property in the context of MongoDB because it's a little different than the IDs that you're probably used to if you've used other database systems, like Postgres or MySQL.

The _id property in the context of MongoDB

To kick off our discussion of the _id property, let's go ahead and rerun the mongodb-connect file. This is going to insert a new document into the Users collection, like we've defined in the db.collection line. I'm going to go ahead and do that by running the file through the node. It's in the playground folder, and the file itself is called mongodb...

Fetching data

Now that you know how to insert data into your database, let's go ahead and talk about how we can fetch data out of it. We're going to be using this technique in the Todo API. People are going to want to populate a list of all the Todo items they need, and they might want to fetch the details about an individual Todo item. All of this is going to require that we can query the MongoDB database.

Fetching todos in Robomongo file

Now, we're going to create a new file based off of mongodb-connect. In this new file, instead of inserting records, we'll fetch records from the database. I'm going to create a duplicate, calling this new file mongodb-find, because find is the method we're going...

Setting up the repo

Before we go any further, I do want to add version control to this project. In this section, we're going to create a new repo locally, make a new GitHub repository, and push our code to that GitHub repository. If you're already familiar with Git or GitHub, you can go ahead and do that on your own; you don't need to go through this section. If you're new to Git and it doesn't make sense just yet, that's also fine. Simply follow along, and we'll go through the whole process.

This section is going to be really simple; nothing MongoDB- related here. To get started, I am going to go ahead and initialize a new Git repository from the Terminal by using git init. This is going to initialize a new repository, and I can always run git status like this to take a look at the files that are untracked:

Here we have our playground folder...

Deleting documents

In this section, you're going to learn how to delete documents from your MongoDB collections. Before we get into that, in order to explore the methods that let us delete multiple documents or just one, we want to create a few more Todos. Currently, the Todos collection only has two items, and we're going to need a few more in order to play around with all these methods involving deletion.

Now, I do have two. I'm going to go ahead and create a third by right-clicking and then going to Insert Document.... We'll make a new document with a text property equal to something like Eat lunch, and we'll set completed equal to false:

{
   text: 'Eat lunch',
   completed: false
}

Now before we save this, I am going to copy it to the clipboard. We're going to create a few duplicate Todos so we can see how we can delete items based...

Updating data

You know how to insert, delete, and fetch documents out of MongoDB. In this section, you're going to learn how to update documents in your MongoDB collections. To kick things off, as usual, we're going to duplicate the last script we wrote, and we'll update it for this section.

I'm going to duplicate the mongodb-delete file, renaming it to mongodb-update.js, and this is where we'll write our update statements. I'm also going to delete all of the statements we wrote, which is the deleted data. Now that we have this in place, we can explore the one method we'll be looking at in this section. This one is called findOneAndUpdate. It's kind of similar to findOneAndDelete. It lets us update an item and get the new document back. So if I update a Todo, set it as completed equal to true, I will get that document back in the response...

Connecting to MongoDB and writing data


To connect to our MongoDB database from inside of Node.js, we're going to be using an npm module created by the MongoDB team. It's called node-mongodb-native, but it includes all of the features you'll need to connect to and interact with your database. To get to it, we're going to Google node-mongodb-native:

The GitHub repo, which should be the first link, is the one we want—the node-mongodb-native repository—and if we scroll down, we can take a look at a few important links:

First up we have documentation, and we also have our api-docs; these are going to be critical as we start exploring the features that we have inside of this library. If we scroll down further on this page, we'll find a ton of examples on how to get started. We'll be going through a lot of this stuff in this chapter, but I do want to make you aware of where you can find other resources because the mongodb-native library has a ton of features. There are entire courses dedicated to...

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Key benefits

  • • Entirely project-based and practical
  • • Explains the "why" of Node.js features, not just the "how", providing with a deep understanding and enabling you to easily apply concepts in your own applications
  • • Covers the full range of technologies around Node.js – npm, MongoDB, version control with Git, and many more

Description

Advanced Node.js Development is a practical, project-based book that provides you with all you need to progress as a Node.js developer. Node is a ubiquitous technology on the modern web, and an essential part of any web developer’s toolkit. If you're looking to create real-world Node applications, or you want to switch careers or launch a side-project to generate some extra income, then you're in the right place. This book was written around a single goal: turning you into a professional Node developer capable of developing, testing, and deploying real-world production applications. There's no better time to dive in. According to the 2018 Stack Overflow Survey, Node is in the top ten for back-end popularity and back-end salary. This book is built from the ground up around the latest version of Node.js (version 9.x.x). You'll be learning all the cutting-edge features available only in the latest software versions. This book delivers advanced skills that you need to become a professional Node developer. Along this journey you'll create your own API, you'll build a full real-time web app and create projects that apply the latest Async and Await technologies. Andrew Mead maps everything out for you in this book so that you can learn how to build powerful Node.js projects in a comprehensive, easy-to-follow package designed to get you up and running quickly.

Who is this book for?

This book is for anyone looking to launch their own Node applications, switch careers, or freelance as a Node developer. You should have a basic understanding of JavaScript in order to follow this book. This book follows directly on from Learning Node.js Development, but more advanced readers can benefit from this book without having read the first part.

What you will learn

  • • Develop, test, and deploy real-world Node.js applications
  • • Master Node.js by building practical, working examples
  • • Use awesome third-party Node modules such as MongoDB, Mongoose, Socket.io, and Express
  • • Create real-time web applications
  • • Explore async and await in ES7
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Table of Contents

11 Chapters
Getting Set Up Chevron down icon Chevron up icon
MongoDB, Mongoose, and REST APIs – Part 1 Chevron down icon Chevron up icon
MongoDB, Mongoose, and REST APIs – Part 2 Chevron down icon Chevron up icon
MongoDB, Mongoose, and REST APIs – Part 3 Chevron down icon Chevron up icon
Real-Time Web Apps with Socket.io Chevron down icon Chevron up icon
Generating newMessage and newLocationMessage Chevron down icon Chevron up icon
Styling Our Chat Page as a Web App Chevron down icon Chevron up icon
The Join Page and Passing Room Data Chevron down icon Chevron up icon
ES7 classes Chevron down icon Chevron up icon
Async/Await Project Setup Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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Martin Richard Sanders Nov 05, 2020
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He is putting me on promotion, because of this book.
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Gratefull reading, I've enjoyed every page.Get the match if you are starting back-end from Javascript!Good book
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3xpl0it2c Oct 04, 2018
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Very good,but I think it is very basic...All I have learned is mongoose, async and socket.ioIt does teach well but I expected More.
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S. Olson Feb 18, 2019
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Why would I buy this title whent he publisher doesn't include a TOC? Tells a story that isn't very promising.
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Anastasios Apr 22, 2024
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A lot of typos on the code. Needs to be updated. Also try on write the code inside a code bracket if its fully done or do piece by piece code not both, it makes it really confusing.
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