Book Image

Hands-On RESTful Web Services with TypeScript 3

By : Biharck Muniz Araújo
5 (1)
Book Image

Hands-On RESTful Web Services with TypeScript 3

5 (1)
By: Biharck Muniz Araújo

Overview of this book

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.
Table of Contents (20 chapters)
Free Chapter
Section 1: Unraveling API Design
Section 2: Developing RESTful Web Services
Section 3: Enhancing RESTful Web Services
Section 4: Extending the Capabilities of RESTful Web Services

Error handling

Error handling is the process of an application catching errors and processing them. These errors usually occur during runtime of an application. It does not matter if an error is synchronous or asynchronous. A default error handler is embedded by default in Express.js hence, it's not required for you to write a specific error handler to get started on a new application as we did.

It is necessary for Express.js to catch any errors that occur while running route handlers and middleware, otherwise errors will be lost. As mentioned, there are some default error handlers for errors that occur in synchronous code inside route handlers and middleware. In the case of default error handlers, no extra work is needed. In other words, if asynchronous code throws an error, then Express.js will catch it and process it by default, as in the following example:

export let...