LWC and Aura interview questions collected from real developer interviews (updated Oct 2026). Covers decorators, lifecycle hooks, wire and imperative Apex, communication between components and Aura events, grouped by topic.
What's Covered
Topics covered in these questions.
01LWC Fundamentals12
02Wire, Apex & Data7
03Communication & Aura10
All Interview Questions
Every question listed one by one, in a fresh order. Answers are not included, so practise explaining each one in your own words.
LWC Fundamentals
1How do you reference the record Id of the page in a component fired from a quick action?
2Why do we use LWC?
3Are quick actions supported for LWC components?
4What is the advantage of LWC over Aura?
5What are the types of decorators in LWC and what does each do?
6How do you navigate from an LWC to a record detail page?
7What is the purpose of the HTML file and the JavaScript file in an LWC bundle?
8How do iteration and conditional rendering work in LWC?
9Can I use multiple decorators on one property?
10What is the difference between the LWC lifecycle hooks, and how is the DOM handled?
11How do you show toast notifications in LWC?
12Explain all files in LWC with their description, decorators and hook methods.
Wire, Apex & Data
13Can we write wire in connectedCallback()?
14How do you call Apex using LWC?
15How do you show data from multiple objects in a single LWC page?
16Why do we use wire, and what is the use of connectedCallback()? Are both called automatically?
17How many times does a wire method execute?
18JavaScript and CSS questions: how do you style and control components?
19How do you call multiple Apex classes in an LWC?
Communication & Aura
20Explain all files in an Aura component with their description.
21What are bound and unbound expressions, and how do you call Apex controllers in Aura?
22What are component events and application events in Aura?
23How do you build lightning implementations using flows and quick actions?
24How do you pass data from one component to another in both Aura and LWC?
25How do you handle exceptions and return values in Aura?
26How do you communicate between unrelated components?
27How do you send data from parent to child in LWC?
28Explain Lightning Message Service (LMS).
29How do you use an action provider to invoke a JavaScript controller action from component markup?
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