Asynchronous

In plain words: By default, all communication between Lightning Web Components (LWC) and Apex happens asynchronously —meaning your JavaScript keeps running without waiting for the server to reply. However, there are times when Step 2 of your code strictly requires the data returned from Step 1 before it can proceed. To achieve this "synchronous" behavior in JavaScript, we use modern async/await and JavaScript Promises. In Salesforce Lightning Web Components, invoking server-side Apex methods is traditionally handled via promises or wire adapters. Because web browsers are designed not to freeze while waiting for a server response, everything happens asynchronously. Sometimes, business logic dictates strict sequential execution—you need to call an Apex method, wait for the response, and only then execute the next line of frontend code. Let's explore how to handle this cleanly using modern JavaScript async/await patterns.