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Home > Web Development > Design > RESTful Web API Design with Node.js 10, Third Edition
RESTful Web API Design with Node.js 10, Third Edition
RESTful Web API Design with Node.js 10, Third Edition

RESTful Web API Design with Node.js 10, Third Edition: Learn to create robust RESTful web services with Node.js, MongoDB, and Express.js , Third Edition

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RESTful Web API Design with Node.js 10, Third Edition

Getting Started with Node.js

In this chapter, you will gain your first real Node.js experience. We will start by installing Node.js, along with some modules we will use throughout this book. Then, we will set up a development environment. Throughout the book, the Atom IDE will be used. Yes, GitHub's online editor has finally landed for desktop environment and is available on a platform of your preference!

Next, we will create a workspace and start developing our first Node.js application. It will be a simple server application processing incoming HTTP requests. We will go one step further, demonstrating how to modularize and unit test our JavaScript code. Finally, we will deploy our first application on the Heroku Cloud Application platform.

To sum up, in this chapter, we will cover the following topics:

  • Installing Node.js
  • Installing the Express framework and other modules...

Installing Node.js

Let's start our journey through Node.js with a Node.js installation. Installers are available for both Windows and macOS at https://nodejs.org/en/download/.  At the time of writing, Node.js 10 has just been released as the current version, and is about to become the next Long Term Support version, in August 2018. Linux users can either build Node.js from the available Linux binaries or make use of their package manager, as Node.js is available with most of the popular package repositories for different Linux distributions. For instance, Ubuntu and other Debian-based distributions should first point to the latest Node.js 10 package and then install via the apt-get command from the shell:

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install nodejs

If you decide to go with an installer available for macOS or Windows...

Installing the Express framework and other modules

Now that we have npm installed, let's make use of it and install some of the modules we will be using heavily throughout this book. The most important among them is the Express framework (http://www.expressjs.com/). It is a flexible web application framework for Node.js, providing a robust RESTful API for developing single or multi-page web applications. The following command will download the Express module from the npm repository and make it available for our local Node.js installation:

npm install -g express

You will find the express module among the results of an npm ls after a successful installation. Later in this chapter, we will learn how to write unit tests for our Node.js modules. We will need the nodeunit module for that purpose:

npm install nodeunit -g

The -g option will install nodeunit globally....

Setting up a development environment

JavaScript developers are rarely used to developing their projects in an IDE; most of them use text editors and tend to be prejudiced against anything that contradicts their views. GitHub has finally managed to calm most of them down by releasing the Atom IDE for the desktop environment. This may not solve all of the arguments about which is the best environment, but will at least bring some peace, and let people concentrate on their code, not on the tooling, which in the end is a matter of personal preference. The samples in this book are developed in the Atom IDE, but feel free to use any piece of software that can create files, including command-line editors such as vi or vim, if that would make you feel like a JS superhero, though bear in mind that superheroes are so 20th century!

You can download the Atom IDE from https://ide.atom.io/...

Handling HTTP requests

Currently, our server application will behave in the same way, no matter what kind of HTTP request is processed. Let's extend it in such a way that it behaves more like an HTTP server, and start differentiating the incoming requests based on their type, by implementing handler functions for each type of request.

Let's create a new hello-node-http-server.js as follows:

var http = require('http');
var port = 8180;

function handleGetRequest(response) {
  response.writeHead(200, {'Content-Type' : 'text/plain'});
  response.end('Get action was requested');
}

function handlePostRequest(response) {
  response.writeHead(200, {'Content-Type' : 'text/plain'});
  response.end('Post action was requested');
}

function handlePutRequest(response) {
  response.writeHead(200, {'Content-Type&apos...

Modularizing code

What we have developed so far is a simple HTTP server application that listens and processes known request types; however, it is not so well structured, as the functions handling the requests are not reusable. Node.js supports modules embracing code isolation and reusability.

A user-defined module is a logical unit consisting of one or more related functions. The module can export one or more functions to other components while keeping other functions visible only to itself.

We will rework our HTTP server application in such a way that the entire request handling functionality will be wrapped in a module. The module will export only a generic handler function that will take a request object as argument and, based on its request type, it will delegate the handling to inner functions not visible outside the module.

Let's start by creating a new module directory...

Testing Node.js

Now we will extend our project by providing a unit test for the HTTP module, but before diving into that, let's have a look at how Node.js supports unit testing in general. At the beginning of this chapter, we installed the Nodeunit module. Well, it's about time we started playing around with it.

First, let's create another simple Node.js module that we will use to implement our first unit test. Then we will move to more advanced topics, such as mocking JavaScript objects and using them to create unit tests for our HTTP module.

I have chosen to develop a simple math module that exports functions for adding and subtracting integer numbers, as it is straightforward enough and the results of each operation are strictly defined.

Let's start with the module and create the following math.js file in our module directory:

exports.add = function...

Deploying an application

Node.js has an event-driven, non-blocking I/O model, which makes it perfect for real-time applications that scale well in distributed environments, such as public or private cloud platforms. Each cloud platform offers tools that allow seamless deployment, distribution, and scaling of its hosted applications. In this section, we will look at two publicly available Node.js application cloud providers—Nodejitsu and Microsoft Azure.

But first, let's spend some time on the clustering support, as it is fundamental for understanding why Node.js fits so well into the cloud environment. Node.js comes with clustering support built in to its core. Using the cluster module in your applications allows them to start as many workers as necessary to handle the load they will face. Generally, it is recommended to match the number of workers to the number of...

Installing Node.js

Let's start our journey through Node.js with a Node.js installation. Installers are available for both Windows and macOS at https://nodejs.org/en/download/.  At the time of writing, Node.js 10 has just been released as the current version, and is about to become the next Long Term Support version, in August 2018. Linux users can either build Node.js from the available Linux binaries or make use of their package manager, as Node.js is available with most of the popular package repositories for different Linux distributions. For instance, Ubuntu and other Debian-based distributions should first point to the latest Node.js 10 package and then install via the apt-get command from the shell:

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install nodejs

If you decide to go with an installer available for macOS or Windows, a wizard will guide you through a rather typical installation procedure, where you will have to accept the Node.js license agreement...

Installing the Express framework and other modules

Now that we have npm installed, let's make use of it and install some of the modules we will be using heavily throughout this book. The most important among them is the Express framework (http://www.expressjs.com/). It is a flexible web application framework for Node.js, providing a robust RESTful API for developing single or multi-page web applications. The following command will download the Express module from the npm repository and make it available for our local Node.js installation:

npm install -g express

You will find the express module among the results of an npm ls after a successful installation. Later in this chapter, we will learn how to write unit tests for our Node.js modules. We will need the nodeunit module for that purpose:

npm install nodeunit -g

The -g option will install nodeunit globally. This means that the module will be stored at a central place on your filesystem; usually, that is either /usr/lib/node_modules  or /usr...

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Key benefits

  • •Create rich and scalable RESTful API solutions from scratch
  • •Explore the new features of Node.js 10, Express 4.0, and MongoDB
  • •Integrate MongoDB in your Node.js application to store and secure your data

Description

When building RESTful services, it is really important to choose the right framework. Node.js, with its asynchronous, event-driven architecture, is exactly the right choice for building RESTful APIs. This third edition of RESTful Web API Design with Node.js 10 will teach you to create scalable and rich RESTful applications based on the Node.js platform. You will be introduced to the latest NPM package handler and understand how to use it to customize your RESTful development process. You will begin by understanding the key principle that makes an HTTP application a RESTful-enabled application. After writing a simple HTTP request handler, you will create and test Node.js modules using automated tests and mock objects; explore using the NoSQL database, MongoDB, to store data; and get to grips with using self-descriptive URLs. You’ll learn to set accurate HTTP status codes along with understanding how to keep your applications backward-compatible. Also, while implementing a full-fledged RESTful service, you will use Swagger to document the API and implement automation tests for a REST-enabled endpoint with Mocha. Lastly, you will explore some authentication techniques to secure your application.

Who is this book for?

If you are a web developer keen to enrich your development skills to create server-side RESTful applications based on the Node.js platform, this book is for you. Some knowledge of REST would be an added advantage, but is definitely not a necessity.

What you will learn

  • • Install, develop, and test your own Node.js user modules
  • •Understand the differences between HTTP and RESTful applications
  • •Use self-descriptive URLs and set accurate HTTP status codes
  • •Eliminate third-party dependencies in your tests with mocking
  • •Implement automation tests for a REST-enabled endpoint with Mocha
  • •Secure your services with NoSQL database integration within Node.js applications
  • • Integrate a simple frontend using JavaScript libraries available on a CDN server
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Publication date : Apr 30, 2018
Length: 178 pages
Edition : 3rd
Language : English
ISBN-13 : 9781788623322
Category :
Web Development
Languages :
JavaScript
Concepts :
Design
Tools :
Express.js

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Length: 178 pages
Edition : 3rd
Language : English
ISBN-13 : 9781788623322
Category :
Web Development
Languages :
JavaScript
Concepts :
Design
Tools :
Express.js

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Table of Contents

10 Chapters
REST – What You Did Not Know Chevron down icon Chevron up icon
REST – What You Did Not Know
REST fundamentals
The REST goals
Working with WADL
Documenting RESTful APIs with Swagger
Summary
Getting Started with Node.js Chevron down icon Chevron up icon
Getting Started with Node.js
Installing Node.js
Installing the Express framework and other modules
Setting up a development environment
Handling HTTP requests
Modularizing code
Testing Node.js
Deploying an application
Self-test questions
Summary
Building a Typical Web API Chevron down icon Chevron up icon
Building a Typical Web API
Specifying the API
Implementing routes
Querying the API using test data
Content negotiation
API versioning
Self-test questions
Summary
Using NoSQL Databases Chevron down icon Chevron up icon
Using NoSQL Databases
MongoDB – a document store database
Database modeling with Mongoose
Testing a Mongoose model with Mocha
Creating a user-defined model around a Mongoose model
Wiring up a NoSQL database module to Express
Self-test questions
Summary
Restful API Design Guidelines Chevron down icon Chevron up icon
Restful API Design Guidelines
Endpoint URLs and HTTP status codes best practices
Extensibility and versioning
Linked data
Summary
Implementing a Full Fledged RESTful Service Chevron down icon Chevron up icon
Implementing a Full Fledged RESTful Service
Working with arbitrary data
Linking
Implementing paging and filtering
Caching
Discovering and exploring RESTful services
Summary
Preparing a RESTful API for Production Chevron down icon Chevron up icon
Preparing a RESTful API for Production
Documenting RESTful APIs
Testing RESTful APIs with Mocha
The microservices revolution
Summary
Consuming a RESTful API Chevron down icon Chevron up icon
Consuming a RESTful API
Consuming RESTful services with jQuery
Troubleshooting and identifying problems on the wire
Cross Origin Resource Sharing
Content Delivery Networks
Handling HTTP status codes on the client side
Summary
Securing the Application Chevron down icon Chevron up icon
Securing the Application
Authentication
Authorization
Transport layer security
Summary
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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.5
(4 Ratings)
5 star 25%
4 star 50%
3 star 0%
2 star 0%
1 star 25%
Aparatologia ANAD SA de CV Aug 17, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I was looking into something that will explain RESTful APIs in Nodejs, and he does a good job, explaning a lot of thing, in some places needs a little more detail, but you can find it on the web... I thought it was lacking code, the only thing I did not know was you need to call "express start" not "node app.js" and you may think that there are some missing parts on it, like having express listen....
Amazon Verified review Amazon
Carlos I. Martinez Aug 09, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Overall I think it's a really good book if you want to understand the basics and a bit more on how REST API are created and how can be maintain. To get the most of this book the reader should code along the book to know how things works.Pro.- Very accurate concepts- It resumes very well the needed http status code- Very straightforward.Cont.- Some parts the author didn't mentioned where the user should write the code- In the MongoDB part there are some missing parts that should be added in order to make express connect to the database that the writer forgot to mention. Ex:In the connection part the port of the localhost can't be omitted for the server to connect to the dbThis is how it worked for me: `mongoose.connect('mongodb://localhost:27017/catalog', { useNewUrlParser: true })`Note:Page 133. Where the reader is asked to add a new item to the catalog via the POST method, in the data property the JSON object doesn't need the Stringify function.
Amazon Verified review Amazon
Vikas Aug 08, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Good introduction but lacking on mongoose concepts e.g. async part of mongoose and how to handle it is missing
Amazon Verified review Amazon
GH Jan 31, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Impossible to follow along, because important instructions about where to write the code and what commands to run are missing.
Amazon Verified review Amazon

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About the author

Profile icon Bojinov
Bojinov
Valentin Bojinov studied computer science at the Technological School of Electronic Systems in Sofia, Bulgaria, a college within the Technical University of Sofia. He holds a B.Sc. in telecommunication and information engineering. Valentin is an expert in Java, SOAP, RESTful web services, and B2B integration. He specializes B2B Integration and Service Oriented Architecture and currently works as an Senior Integration Consultant in an UK consultancy company Estafet Limited.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela