Hands-On Full Stack Development with Spring Boot 2 and React - Second Edition

Using the fetch API

With the fetch API, you can make web requests. The idea of the fetch API is similar to traditional XMLHttpRequest, but the fetch API also supports promises, which makes it more straightforward to use. You don't have to install any libraries if you are using fetch.

The fetch API provides a fetch() method that has one mandatory argument, which is the path of the resource you are calling. In the case of a web request, it will be the URL of the service. For a simple GET method call, which returns a JSON response, the syntax is the following. The fetch() method returns a promise that contains the response. You can use the json() method to parse the JSON body from the response:

fetch('http://someapi.com').then(response => response.json()) ...