Lightning Web Components

Front-end development in Salesforce has constantly introduced new technologies and methods over time. This progression has been marked by significant changes that improved both user experiences and business solutions.

One such major change in recent years is Salesforce’s move from the Aura framework to Lightning Web Components (LWC).

Aura provided Salesforce developers with tools to design interactive user interfaces. But with technological advancements, change is essential.

The introduction of LWC in the Salesforce domain indicates a shift towards more efficient, modular, and up-to-date web practices. This change impacts developers and businesses, empowering them to harness the full potential of Salesforce. 

In this blog, we will discuss the specifics of this transition and what LWC brings to the table.

The Legacy of Aura

Aura, developed by Salesforce, provided a robust framework for developing dynamic web applications for both mobile and desktop devices without reliance on traditional MVCs.

It was born out of a need to offer more interactive and responsive user interfaces. It was a step beyond its predecessor Visualforce. Aura served as a cornerstone in Salesforce development for years, allowing developers to create component-based apps that were both reusable and customizable.

What limited Aura?

  1. Complexity: For those unfamiliar with component-based frameworks, there was a steep learning curve associated with Aura.
  2. Performance: Some developers felt that Aura apps weren’t as fast or efficient as those built with newer technologies.
  3. Less adherence to web standards: While Aura was cutting-edge at its inception, as web standards evolved, it did not align as closely with modern practices as newer frameworks, like Lightning Web Components (LWC), did.

What’s a Web Component?

What’s a web component

Web components adhere to a series of standards. Multiple specifications together are recognized as “web components”:

  • Custom elements-

These empower developers to introduce custom HTML tags for use within their existing code. So, instead of a recurring series of <div> tags, you can invent your tag, say <myapp-navbar>. This custom element can house its unique UI and functionalities.

  • HTML templates-

With HTML templates, you can design a segment of HTML that remains dormant until called upon. These templates can include <slot> tags, permitting dynamic content infusion into specified sections of the template.


  • Shadow DOM-

Shadow DOM is essentially a method to modularize the Document Object Model (DOM). While the DOM illustrates every element of your webpage, accessing it usually requires a broad sweep, querying the entire document for nodes of certain attributes.

This can be problematic for component encapsulation as it might lead to unintended overlaps. With the shadow DOM, you can generate a “shadow tree” that exclusively holds your component’s elements. This offers the benefit of isolating the elements inside this tree from those outside.

What are Lightning Web Components?

Lightning Web Components or LWC, represent Salesforce’s modern framework for building fast, efficient, and scalable web applications.

They are part of the Lightning Component framework, a Salesforce UI framework for developing dynamic web apps for mobile and desktop devices with no dependency on third-party libraries. 

LWC is specifically designed to leverage the latest web standards and to be interoperable with the original Aura programming model.

What are the Benefits of Using Lightening Web Components?

What are the benefits of using Lightening Web Components

  • Web standard-driven

LWC employs fundamental web component standards, which provide a consistent and modern framework for developers.

By adhering to these standards, LWC ensures that applications are built using the latest technological advancements and best practices in web development. 

This approach guarantees that developers are equipped with contemporary tools and methodologies, fostering more efficient and up-to-date web application creation within the Salesforce ecosystem.

  • Performance

Built on the principles of the modern web, LWC boosts performance metrics. When compared to older frameworks, LWC exhibits enhanced operational efficiency.

This advancement translates into quicker web application load times and smoother interactions for users, enhancing overall usability and engagement within the Salesforce platform.

  • Interoperability

Even though LWC and Aura components have different programming models, they can coexist and interoperate on the same page. 

This compatibility ensures that developers can leverage the strengths of both frameworks simultaneously, enhancing the versatility of Salesforce-based applications.

  • Encapsulation

LWC uses a feature called encapsulation. This means that when you style or design one component, it won’t change or interfere with others. Because of this, each part can stand alone, making the whole system easy to understand and update. 

  • Data binding

Wire service feature lets components fetch Salesforce data and keep it stored. But if the original data changes, this stored data gets automatically updated.

  • Open source

Salesforce made LWC open-source, allowing any developer to look into its inner workings by accessing the source code. 

This transparency not only enables them to tailor the code to their needs but also to suggest or make improvements. Essentially, the developer community can actively participate in shaping its growth and direction.

  • Enhanced tooling

Salesforce offers a set of tools and extensions, notably the Salesforce Extension for Visual Studio Code, which provides a rich development experience with features like code completion, linting, and server-side code execution.

Comparing LWC with Aura Components

Feature  LWC Aura
Programming model Component-based, using standard web technologies Proprietary model
Standards Based on Web Components standards Not fully standards-based
Language JavaScript ES6+ JavaScript ES5
UI language HTML Proprietary markup (.cmp)
Styles Standard CSS with shadow DOM Proprietary styles with global
Data binding One-way data binding Two-way data binding
Performance Typically faster due to more modern and standards-based architecture Generally slower than LWC
Interoperability Can be used alongside Aura components Can be used alongside LWC
Tooling Enhanced support in Salesforce Developer Tools Earlier tooling; less modern
Component communication Uses standard events and properties Uses component events and application events
Lifecycle hooks Similar to modern web frameworks Custom Aura lifecycle hooks
Security Uses Lightning Locker for security Uses Lightning Locker for security, but has some differences in implementation
Browser support Focus on modern browsers Broader browser support
Adoption Recommended for new developments Legacy, fewer new developments

Key Differences and Considerations when Transitioning from Aura to LWC

Transitioning from Aura Components to Lightning Web Components (LWC) requires an understanding of the key differences and some careful considerations. 

Here’s a breakdown of these differences and best practices for a smooth transition:


  • Programming model

Aura components are constructed using a proprietary component-based model unique to the Salesforce platform. In contrast, LWC adheres to the standard Web Components model, aligning more closely with modern web development practices. 

Consequently, developers acquainted with current JavaScript frameworks often find the transition to LWC smoother and the programming model more intuitive than Aura’s approach. This alignment with web standards makes LWC more accessible and future-proof.

  • Language Standards

Aura components are built upon ES5 JavaScript, which represents an older specification of the language with limited features. Whereas, LWC embraces the advancements of modern ES6+ JavaScript. 

This newer standard introduces robust capabilities, including class-based structures, template literals for easier string manipulations, and other syntactical improvements. The adoption of ES6+ in LWC provides developers with a richer toolset and also aligns the platform closer to contemporary web development practices.

  • UI language

Aura components rely on a proprietary markup language, denoted by the .cmp file extension, which is unique to the Salesforce platform. It requires specific knowledge for effective utilization. 

On the other hand, LWC employs standard HTML for their user interface construction. This shift to a universally recognized and widely adopted markup language simplifies the learning curve for developers and aligns Salesforce’s component design more closely with modern web standards.   

  • Data binding

Aura’s framework champions two-way data binding, allowing automatic synchronization between the component’s state and its presentation. While this can simplify some tasks, it can also lead to unforeseen side effects. Conversely, LWC emphasizes one-way data binding. 

This design choice streamlines the flow of data, ensuring it moves in a singular direction, leading to more predictable state management. However, this approach necessitates a paradigm shift for developers accustomed to the reflexive nature of two-way data binding, compelling them to adopt new patterns.  

  • Component communication

Aura facilitates communication using a combination of component and application events, providing a custom mechanism tailored to the Salesforce ecosystem. This architecture often requires specific knowledge and patterns. 

LWC harnesses standard DOM events and properties for inter-component dialogue. This approach, grounded in fundamental web development practices, streamlines the learning curve and enhances interoperability. 

  • Lifecycle hooks

Aura operates with a vast set of lifecycle hooks, tailored to its unique component model, necessitating specialized knowledge for developers to effectively manage component instantiation, rendering, and destruction.

LWC implements lifecycle hooks that resonate with those in contemporary frameworks, such as connectedCallback. 

This alignment with modern frameworks means that developers familiar with today’s web development paradigms will find LWC’s lifecycle management more intuitive, ensuring a smoother transition and more consistent component behavior. 

  • Security

Both Aura and LWC use the Lightning Locker for security. However, there are some differences in how they’re implemented and which APIs are accessible. Developers should check Locker API Viewer for compatibility.

Best Practices

Best practices

  • Training

Transitioning to LWC mandates a foundational understanding of modern JavaScript and its associated paradigms. It’s crucial to equip the team with the knowledge and skills pertinent to the LWC programming model. This transition may necessitate structured training sessions or encourage self-directed study. 

The investment in education ensures that developers are proficient and confident in using the full potential of LWC. A well-trained team can more efficiently navigate the nuances of the framework, optimizing productivity and the quality of the end product.

  • Refactoring

Shifting from Aura to LWC isn’t a straightforward replication process. Although certain logic elements might be transferable, the migration often breaks mere “copy-paste” actions. Differences in architecture and standards necessitate that components undergo thoughtful refactoring, or in some cases, complete rewrites. 

This underscores the importance of a meticulous approach to ensure that the transition utilizes the strengths of LWC while maintaining the intended functionality and optimizing performance.

  • Tooling

Optimal development in the Salesforce ecosystem necessitates the use of the most up-to-date Developer Tools. These tools are continually refined to offer superior support for modern frameworks like LWC. 

By leveraging the latest iterations, developers gain access to advanced features, integrations, and debugging capabilities specifically tailored for LWC. Thus, staying updated ensures compatibility and also streamlines the development process. 

  • Testing

During the migration from Aura to LWC, exhaustive testing is paramount. LWC’s underpinnings, though advanced, may produce behaviors distinct from Aura, especially concerning data binding and event propagation. These nuances can subtly affect component interactions and outcomes. 

Rigorous testing ensures that these differences are identified and addressed, maintaining application integrity. By diligently validating each component’s behavior and the broader system interactions, developers can guarantee a seamless transition, preserving functionality and user experience.

  • Documentation

Salesforce offers robust documentation tailored for LWC, serving as an invaluable resource for developers.

This comprehensive guide delves into the intricacies of the framework, providing insights, best practices, and troubleshooting tips. During migration, developers should treat this documentation as a compass, ensuring accurate and effective transitions.

  • Dependencies

In scenarios where certain libraries or components are incompatible with LWC, developers must undertake the task of finding appropriate replacements or alternatives. This process is critical to preserving functionality and ensuring smooth interactions within the new LWC environment. Proactive verification of dependencies minimizes unexpected disruptions and streamlines the migration journey.

  • Focus on Reusability

Instead of directly converting large, monolithic Aura components, developers should consider segmenting them into modular, reusable LWC units. This strategic approach enhances the manageability and scalability of the codebase and promotes a more efficient and flexible development process in the future.   

Future of Salesforce Development in Front-end

Future of Salesforce development in front-end-compressed

Lightning Web Components, with their modern framework and alignment with web standards, are poised to shape the future of Salesforce front-end development.

By leveraging the capabilities of LWC, businesses can drive more efficient, scalable, and seamless digital experiences for their users.

With a proven track record in Salesforce solutions, ScrumDigital can streamline your transition and maximize your platform’s potential. Reach out to ScrumDigital today and set the stage for a brighter, more efficient Salesforce future.

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