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Hands-On RESTful Web Services with TypeScript 3
Hands-On RESTful Web Services with TypeScript 3

Hands-On RESTful Web Services with TypeScript 3: Design and develop scalable RESTful APIs for your applications

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Hands-On RESTful Web Services with TypeScript 3

Introduction to RESTful API Development

In order to get the best from any technology, it is necessary to understand deeply what the technology does. Throughout this chapter, RESTful concepts will be explained in detail with necessary elements to help you to develop and run RESTful services. The main objective of the chapter is to show you comprehensive examples that transpose these concepts to real-world scenarios and help you to understand their definitions in an easier way.

Currently, there is a huge necessity for applications to scale when necessary; they need to be fast, secure, portable, and trustable. These applications no longer serve one specific purpose; in fact, they work to solve corporative issues and meet the needs of end users.

APIs are the core elements for creating web and mobile applications. They provide structured data for your applications. This chapter mainly...

Technical requirements

There are no requirements for this chapter; this chapter will lay the foundation for what this book is going to cover.

What is REST?

RESTful web services are services built according to REST principles. The idea is to have them designed to essentially work well on the web. Alright, but what is REST? Let's start from the beginning, that is, by defining REST.

The REST style is a set of software engineering practices that contains constraints that should be used in order to create web services in distributed hypermedia systems. REST is not a tool and neither is it a language; in fact, REST is agnostic of protocols, components, and languages.

It is important to say that REST is an architectural style and not a toolkit. REST provides a set of design rules in order to create stateless services that are shown as resources and, in some cases, sources of specific information such as data and functionality. The identification of each resource is performed by its unique Uniform Resource Identifier...

REST architectural styles

The REST architectural style describes six constraints. These constraints were originally described by Roy Fielding in his Ph.D. thesis ( https://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm). They include the following:

  • Uniform interface
  • Stateless
  • Cacheable
  • Client-server architecture
  • A layered system
  • Code on demand (optional)

We will discuss them all minutely in the following subsections.

Uniform interface

Uniform interface is a constraint that describes a contract between clients and servers. One of the reasons to create an interface between them is to allow each part to evolve regardless of each other. Once there is a contract aligned with the client and server parts, they...

HTTP methods for RESTful services

The use of HTTP verbs allows a clear understanding of what an operation is going to do. In general, the primary or most commonly used HTTP verbs are POST, GET, PUT, PATCH, and DELETE, which stand for create, read, update (PATCH and PUT), and delete, respectively. Of course, there are also a lot of other verbs, but they are not used as frequently:

Method HTTP method description
GET GET is the most common HTTP verb. Its function is to retrieve data from a server at the specified resource.

For example, a request made to the GET https://<HOST>/customers endpoint will retrieve all customers in a list format (if there is no pagination).

There is also the possibility of retrieving a specific customer such as GET https://<HOST>/customers/1234; in this instance, only the customer with the 1234 ID will be retrieved.

It is important to add...

Summary

In this chapter, we talked about the various HTTP methods and when each one of them should be used. We also discussed the principles of RESTful services. All elements presented in this chapter and the upcoming chapters will be applied in the case study.

We also covered the general idea of HTTP methods and verbs based on examples with JSON. The REST architectural style was described based on six constraints.

In the next chapter, we will present the best practices related to RESTful design such as API endpoint organization, different ways to expose an API service, how to handle large datasets, naming conventions, the HTTP status codes, and API versioning.

Questions

  1. What method should be used in order to change the resource state?
  2. What is the best way to create a new resource?
  3. What are the REST architectural style constraints?
  4. What is the only optional REST architectural style constraint?
  5. If you need to change only two fields in a resource that contains more than two fields, what verb should you use?
  6. What is the verb used to update the whole resource?
  7. What does GET do?

Further reading

In order to improve your knowledge of REST, RESTful, and RESTful styles, the following books are recommended to be read, as they will be helpful in the coming chapters:

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Key benefits

  • Gain in-depth knowledge of OpenAPI and Swagger to build scalable web services
  • Explore a variety of test frameworks and test runners such as Stryker, Mocha, and Chai
  • Create a pipeline by Dockerizing your environment using Travis CI, Google Cloud Platform, and GitHub

Description

In the world of web development, leveraging data is the key to developing comprehensive applications, and RESTful APIs help you to achieve this systematically. This book will guide you in designing and developing web services with the power of TypeScript 3 and Node.js. You'll design REST APIs using best practices for request handling, validation, authentication, and authorization. You'll also understand how to enhance the capabilities of your APIs with ODMs, databases, models and views, as well as asynchronous callbacks. This book will guide you in securing your environment by testing your services and initiating test automation with different testing approaches. Furthermore, you'll get to grips with developing secure, testable, and more efficient code, and be able to scale and deploy TypeScript 3 and Node.js-powered RESTful APIs on cloud platforms such as the Google Cloud Platform. Finally, the book will help you explore microservices and give you an overview of what GraphQL can allow you to do. By the end of this book, you will be able to use RESTful web services to create your APIs for mobile and web apps and other platforms.

Who is this book for?

If you’re a developer who has a basic understanding of REST concepts and want to learn how to design and develop RESTful APIs, this book is for you. Prior knowledge of TypeScript will help you make the most out of this book.

What you will learn

  • Explore various methods to plan your services in a scalable way
  • Understand how to handle different request types and the response status code
  • Get to grips with securing web services
  • Delve into error handling and logging your web services for improved debugging
  • Uncover the microservices architecture and GraphQL
  • Create automated CI/CD pipelines for release and deployment strategies

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 27, 2019
Length: 470 pages
Edition : 1st
Language : English
ISBN-13 : 9781789956276
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Product Details

Publication date : Mar 27, 2019
Length: 470 pages
Edition : 1st
Language : English
ISBN-13 : 9781789956276
Languages :
Concepts :
Tools :

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Table of Contents

19 Chapters
Section 1: Unraveling API Design Chevron down icon Chevron up icon
Introduction to RESTful API Development Chevron down icon Chevron up icon
Principles of Designing RESTful APIs Chevron down icon Chevron up icon
Designing RESTful APIs with OpenAPI and Swagger Chevron down icon Chevron up icon
Section 2: Developing RESTful Web Services Chevron down icon Chevron up icon
Setting Up Your Development Environment Chevron down icon Chevron up icon
Building Your First API Chevron down icon Chevron up icon
Handling Requests and Responses Chevron down icon Chevron up icon
Formatting the API - Output Chevron down icon Chevron up icon
Section 3: Enhancing RESTful Web Services Chevron down icon Chevron up icon
Working with Databases and ODMs Chevron down icon Chevron up icon
Securing Your API Chevron down icon Chevron up icon
Error Handling and Logging Chevron down icon Chevron up icon
Creating a CI/CD Pipeline for Your API Chevron down icon Chevron up icon
Section 4: Extending the Capabilities of RESTful Web Services Chevron down icon Chevron up icon
Developing RESTful APIs with Microservices Chevron down icon Chevron up icon
Flexible APIs with GraphQL Chevron down icon Chevron up icon
Assessments Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
(4 Ratings)
5 star 50%
4 star 0%
3 star 25%
2 star 25%
1 star 0%
Webia1 Sep 14, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Sehr empfehlenswert,..
Amazon Verified review Amazon
Amazon Customer May 06, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
good in-depth study on rest api’s
Amazon Verified review Amazon
LV Feb 02, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Shorter review with better rating:- Book tries too hard to cover everything, a lot of work probably went into it though.- Object Oriented features that make TS powerful in developing Web Services (or anything) are kind of missing.- As a result it feels like TS is merely used as JS with base-types checking.- Examples could use a revision with some real Object Oriented Programming and OO Design Patterns.
Amazon Verified review Amazon
Alexander Josef Oct 02, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I'm a Java veteran interested in understanding better the modern JS web development world. I really like the topic and the hands-on approach that the author chooses to explain modern RESTful API programming. However, the eBook is so full of errors, it doesn't deserve more than 2 stars. Please spend some time and re-visit the code examples in the book and fix them.At least the git repository that contains all code from the book seems to to be tested and has running examples.
Amazon Verified review Amazon
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