Book Image

Building Python Web APIs with FastAPI

By : Abdulazeez Abdulazeez Adeshina
Book Image

Building Python Web APIs with FastAPI

By: Abdulazeez Abdulazeez Adeshina

Overview of this book

RESTful web services are commonly used to create APIs for web-based applications owing to their light weight and high scalability. This book will show you how FastAPI, a high-performance web framework for building RESTful APIs in Python, allows you to build robust web APIs that are simple and intuitive and makes it easy to build quickly with very little boilerplate code. This book will help you set up a FastAPI application in no time and show you how to use FastAPI to build a REST API that receives and responds to user requests. You’ll go on to learn how to handle routing and authentication while working with databases in a FastAPI application. The book walks you through the four key areas: building and using routes for create, read, update, and delete (CRUD) operations; connecting the application to SQL and NoSQL databases; securing the application built; and deploying your application locally or to a cloud environment. By the end of this book, you’ll have developed a solid understanding of the FastAPI framework and be able to build and deploy robust REST APIs.
Table of Contents (14 chapters)
Part 1: An Introduction to FastAPI
Part 2: Building and Securing FastAPI Applications
Part 3: Testing And Deploying FastAPI Applications

Chapter 3: Response Models and Error Handling

Response models serve as templates for returning data from an API route path. They are built on Pydantic to properly render a response from requests sent to the server.

Error handling includes the practices and activities involved in handling errors from an application. These practices include returning adequate error status codes and error messages.

By the end of this chapter, you will know what a response is and what it consists of, and you’ll know about error handling and how to handle errors in your FastAPI application. You will also know how to build response models for request responses using Pydantic.

In this chapter, we’ll be covering the following topics:

  • Responses in FastAPI
  • Building a response model
  • Error handling