Maintain Your JavaScript Developer Certification for Summer ’26
Learning Objectives
After completing this unit, you’ll be able to:
- Explain how state managers help organize and share data across Lightning Web Components (LWCs).
- Describe how LWC local actions enhance screen flows with browser-based functionality.
- Identify the benefits and security considerations of using LWS Trusted Mode for third-party scripts.
- Discover how Single Component Live Preview improves the Lightning Web Component development workflow.
Stay Current with Your Certification
Salesforce certifications hold the most value when you keep them relevant. To keep your JavaScript developer certification current, complete this badge by the due date.
Interested in learning more about getting certified? Check out the JavaScript Developer certification.
While anyone can earn this badge, it is designed for those who hold the JavaScript developer certification.
As part of the Salesforce Certification Program, you agree to the terms of the Salesforce Certification Program Agreement. Review the exam policies in the agreement and the Salesforce Certification Program Agreement and Code of Conduct article before you continue.
JavaScript Developer Certification Overview
As a JavaScript developer, you deliver the best value when you:
- Create intuitive user experiences using Lightning Web Components and modern JavaScript techniques.
- Develop secure, high-performing applications that follow Salesforce development best practices.
- Build reusable, maintainable components that support scalable application architectures.
- Connect Salesforce with external data and services through APIs and integration patterns.
- Continuously adopt new platform capabilities and development tools to maximize business value.
This badge highlights key updates you need to know for JavaScript developer Summer ’26 to keep your certification current and your skills sharp.
Simplify Data Interactions with State Managers for LWC
State managers for Lightning Web Components (LWC) are now generally available, making it easier to organize and manage application data across complex Salesforce apps. State management provides a centralized way to handle shared data and related business logic, helping developers create scalable, maintainable applications.
A state manager acts as a dedicated layer for managing application state. Instead of each component independently retrieving and storing its own data, components can access and update shared state through a centralized manager. This approach improves consistency across the user experience and reduces duplicated logic.
Using state managers helps developers:
- Share data across multiple components more efficiently.
- Coordinate complex interactions between synchronized components.
- Separate data handling from presentation logic.
- Simplify maintenance and debugging in large applications.
- Improve overall application structure and scalability.
This separation of concerns is especially valuable in enterprise applications where many components depend on the same data. By moving data access and state logic into a dedicated layer, developers can build cleaner, more modular LWCs and allow the Salesforce platform to manage data interactions more effectively.
Keep in mind that state managers are supported in Lightning Experience but aren’t currently available in Experience Cloud sites.
Use LWC Components for Local Actions in Screen Flows
Screen flows are now even more powerful with support for Lightning Web Component local actions. Developers can create LWCs that run directly in the browser and use them as actions within Flow Builder. Because these actions execute locally, they can access browser-based functionality and provide faster, more interactive user experiences.
LWC local actions let flows perform client-side tasks such as:
- Displaying confirmation or notification toast messages
- Navigating users to record pages or URLs
- Interacting with browser capabilities
- Enhancing user experience without additional server calls
This feature helps developers build more responsive and dynamic screen flows because it combines the flexibility of LWCs with the declarative power of Flow Builder.
To create a local action, developers build a Lightning web component in an SFDX (Salesforce Developer Experience) project and expose it using the lightning__FlowAction target in the component configuration file. Once deployed to the org, the component becomes available as an Action element inside Flow Builder.
The component can accept configurable input properties from the flow and execute custom logic through the invoke() method. For example, a local action can display a toast notification using the ShowToastEvent from the Lightning Platform APIs.
This enhancement is especially exciting because it expands what screen flows can do directly in the browser. It enables richer interactions and smoother user experiences and reduces reliance on server-side processing.
Elevate Third-Party Scripts with LWS Trusted Mode
Lightning Web Security (LWS) Trusted Mode lets developers run trusted third-party scripts in Lightning web components without the normal restrictions enforced by Lightning Web Security and Lightning Locker. This enhancement gives developers greater flexibility when integrating business-critical JavaScript libraries and applications that require access to the browser’s global context.
Traditionally, LWS and Lightning Locker protect Salesforce applications by isolating components and restricting access to sensitive browser APIs and the global document object model (DOM). While these protections improve security, some third-party libraries and frameworks depend on unrestricted browser access and global state to function correctly.
With Trusted Mode, developers can selectively let approved third-party scripts run outside of these security layers when they trust the code to be safe and secure.
This feature enables several important capabilities:
- Access to browser APIs that are normally restricted or wrapped by LWS and Locker
- Full DOM manipulation, including Salesforce-managed elements and shadow DOM
- Improved performance for resource-intensive applications
- Better compatibility with global JavaScript libraries such as jQuery and D3
Trusted Mode is especially useful for analytics tools, visualization libraries, and other integrations that require unrestricted access to the browser environment.
However, this flexibility comes with important security considerations. When Trusted Mode is enabled, Salesforce security protections no longer apply to those scripts. Customers are fully responsible for validating the safety and security of any third-party code they allow to run in this elevated context.
This feature applies to Lightning web components in Lightning Experience and Aura-based Experience Cloud sites, but it doesn’t apply to Lightning Web Runtime (LWR) sites or Aura components.
Preview a Single Lightning Web Component in Your Browser
Single Component Live Preview for Lightning Web Components is now generally available, making it easier for developers to preview and test components in real time directly in the browser.
This feature allows developers to quickly view changes to an individual Lightning web component without deploying the component to an org or navigating through a full application. As code is updated, the preview refreshes automatically for a faster and more efficient development workflow.
Previously known as Local Dev for single components, the feature has been renamed as part of the broader transition to Salesforce Live Preview.
The developer experience has also been simplified in this release. The Salesforce CLI now automatically installs the required Live Preview plug-in, removing the need for manual installation steps. In addition, if developers attempt to use Live Preview commands before enabling the feature, the CLI now provides guided prompts within the IDE to help configure it correctly.
Sum It Up
From state managers and Lightning Web Component local actions to LWS Trusted Mode and Single Component Live Preview, the latest LWC enhancements are designed to make Salesforce development faster, more powerful, and more efficient. In this badge you learned how these capabilities simplify complex data interactions, expand browser-based functionality in screen flows, improve compatibility with third-party JavaScript libraries, and accelerate testing and debugging. Together, these updates give developers greater flexibility, stronger performance, and a more streamlined experience for building modern Salesforce applications.