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Nail Your LWC Interview with the below questions and Answers

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Lightning web components, which are special HTML elements concocted from HTML alongside contemporary JavaScript, stand at the core of our exploration. It is highly advised for individuals prepping for an LWC  interview to deeply engross themselves in a comprehensive review of the LWC interview questions and answers.

1. What Exactly are Lightning Web Components?

    Lightning Web Components (LWC) refers to a method for crafting custom HTML elements using both JavaScript and HTML.

2. Identifying Differences Between LWC and Aura

    Lightning components via LWC are crafted utilizing web stack technologies, contrasting with Aura-based lightning components which employ HTML5 alongside JavaScript.

3. Defining Salesforce Lightning

    Salesforce Lightning signifies a framework built on components intended for app development within Salesforce. It is primarily aimed to streamline development for those lacking extensive programming knowledge.

4. Enumerating Components Within Salesforce Lightning

    Components within Salesforce Lightning include:

    a. Lightning Exchange

    b. Lightning Component Framework

    c. Tools for Visual Building

    d. The Lightning Experience

    e. Lightning Design System

5. Contrasting LWC and Aura

    Lightning components through LWC are constructed with web stack technologies, while Aura’s lightning components utilize HTML5 and JavaScript.

6. Methods to Create Lightning Components

    Lightning components can be developed through two methodologies: the Aura Components model and the Lightning Web Components model.

7. Contents of a Component Bundle

    A lightning component’s bundle comprises:




    Helper, and


8. The Role of Visual Building Tools

    Visual Building tools facilitate app development by providing capabilities for drag-and-drop, making it quicker and more straightforward.

9. Various Lightning Page Types

    Available Lightning page types include:

    Embedded Service Page,

    Home Page,

    App Page, and

    Record Page

10. Distinguishing Between Salesforce Classic and Salesforce Lightning

    Salesforce Classic necessitates hiring a developer for operation, whereas Salesforce Lightning simplifies tasks without always needing Visualforce. Lightning outperforms Classic with its enhanced security features.

11. LWC Lifecycle Hooks

    Lifecycle hooks in LWC are callback methods activated during certain life stages of a component instance, including:

    • Constructor.

    • Connectedcallback.

    • Renderedcallback.

    • Disconnectedcallback.

    • Error callback.

12. Salesforce Lightning Tools

    Tools within Salesforce Lightning encompass:

    • The Lightning Schema Builder: A UI tool for field, object, and relationship visualization and creation.

    • Lightning Connect: An integration tool simplifying data ingestion from external sources compliant with OData.

    • Lightning Process Builder: A UI tool for automating business processes visually.

    • Lightning Component Framework: Facilitates customization of the Salesforce1 mobile app, creation of standalone apps, and component reusability.

    • Lightning App Builder: The latest UI tool for swift Lightning app creation through Salesforce-developed components.

13. Navigating within Lightning

    Lightning navigation is employed to navigate page references or to craft URLs from said references. Navigation can encompass:

    • Lightning Component

    • Object Page

    • Named Page

    • Navigation Item Page

    • Web Page

    • Knowledge Article

    • Record Relationship Page

    • Record Page

14. Transmission Stages of Application Events

    • Capture Phase

    • Bubble Phase

    • Default Phase

15. Aura and LWC: Can They Coexist?

    The Aura UI framework, created by Salesforce, enables the development of dynamic web apps, with Lightning components constructed using the Lightning framework. Given that both Aura and LWC utilize web technologies albeit differently (Aura using HTML5 and JavaScript, and LWC leveraging a broader web stack), they can exist concurrently.

16. Defining LCF

    LCF is an abbreviation for Lightning Component Framework.

17. Benefits of the Lightning Component Framework

    Advantages of utilizing the Lightning Component Framework include:

    • Availability of ready-made components

    • A wide ecosystem for custom components

    • Rapid development cycle

    • Compatibility across devices and browsers

18. Purpose Behind LWC

    LWC is designed by Salesforce to assist developers in generating reusable HTML elements for web pages and applications.

19. LWC Best Practices

    Optimal practices in LWC encompass data caching where feasible, employing conditional rendering and pagination in lists, utilizing base lightning components, and adopting SLDS icons alongside styling. There are two mediums for data caching in LWC, one through Apex and another via the Lightning Data service.

20. Bound vs Unbound Expressions

    In LWC, data binding is achieved through bound and unbound expressions. Enabling the passing of values from parent component attributes to those of a child whenever the child is invoked.


1. The Role of JavaScript in LWC

  • JavaScript is responsible for determining how HTML attributes behave.
  • If one needs to bring in a function, class, or variable from the module, the import statement is necessary.
  • In the context of LWCs, ES6 modules are essentially JavaScript files, with all defined within the module being restricted to its local scope.
  • The core module of the Lightning Web Components has a low footprint. Via the import statement, LightningElement is brought into the equation from the lwc

2. Why Choose LWC?

As Salesforce’s platform keeps advancing, LWC stands out as a pivotal innovation in the realm of web development. By harnessing the power of contemporary web standards such as HTML, CSS, and JavaScript, LWC facilitates the creation of web applications that are not only quick and modular but also scalable. Due to its superior performance, reusability, and simplicity in development, a multitude of Salesforce developers now prefer LWC as their framework of choice.

3. How to Transfer Data from Parent Component to Child in LWC?

To facilitate communication from a parent to a child component, you simply need to make your function or property accessible by marking it with the @api decorator. Then, within your parent component, utilize the querySelector to locate the child component and access the attribute or method that’s been exposed.

4. If we have parent component A and it has two child components B and C, how can communication occur between B and C?

The optimal approach involves emitting an event from the child component B directed towards parent A, which then invokes the exposed method or property (tagged with @api) to relay data to component C.

5. The Significance of Interview Preparation

The process of getting ready for an LWC interview might seem daunting. It demands a profound grasp of LWC’s principles, established practices, and practical application experience. In efforts to assist you along this path, we’ve put together an exhaustive collection of interview inquiries spanning a broad array of LWC-related topics.


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