March 2026
Intermediate to advanced
512 pages
11h 26m
English
Content preview from Salesforce Lightning Web Component Cookbook
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5
Accessing External Data Sources via Lightning Web Components
Now that we know how to write asynchronous JavaScript through the async/await pattern and with promise chains, let's look at a common use case for this method of processing: retrieving data from an external source. We will do this through a REST API callout in Apex and with the Fetch API in JavaScript.
We are going to be covering the following main recipes:
- Writing REST APIs in Apex
- Deserializing JSON results into wrappers
- Serializing wrappers into JSON
- Displaying retrieved data
- Parsing JSON into JavaScript objects
- Utilizing the fetch API in JavaScript
Technical requirements
The recipes in this book can be found at https://github.com/PacktPublishing/Salesforce-Lightning-Web-Component-Cookbook ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.