Salesforce Certified JavaScript Developer Exam Questions

About the Salesforce JavaScript Developer Certification

The Salesforce Certified JavaScript Developer credential is for individuals with experience building front-end or back-end JavaScript applications for the web stack. These skills can be applied to any framework and are not limited to specific devices.

This certification confirms both core JavaScript knowledge and practical development skills, especially for those working with Salesforce technologies such as the Lightning Component Framework and Lightning Web Components (LWC). LWCs are custom HTML elements built with standard HTML and modern JavaScript.

To earn this certification, candidates must complete two components:

1. JavaScript Developer Exam – A proctored, multiple-choice exam focusing on JavaScript fundamentals.

2. Lightning Web Components Specialist Superbadge – A hands-on challenge assessing LWC development skills.

These can be completed in any order. Earning both automatically grants the Salesforce Certified JavaScript Developer credential.

Who the Certification is For

This certification is intended for:

• Developers using JavaScript in one or more frameworks to build front-end and/or back-end applications.

• Professionals who can design, develop, and test solutions that are efficient, maintainable, and reusable.

• Those who apply JavaScript design patterns and work with CSS, HTML, and other markup languages.

Because LWCs use standard JavaScript, any JavaScript developer can quickly start building on Salesforce without learning a completely new language. Developers can leverage the Lightning Platform’s tools and modern JavaScript to create fast, scalable applications.

Typical job roles include:

• JavaScript Programmer

• Salesforce Developer

• Full Stack Developer

• Web Application Developer

• Front-End Developer

• Back-End/Software Developer

• Support Engineer

• Technical Product or Project Manager

• UI/UX Engineer

About the Exam

The JavaScript Developer Exam is an industry-recognized certification in the JavaScript ecosystem. It is recommended for individuals with 1–2 years of experience developing JavaScript applications for the web stack.

Exam details:

• Format: 60 scored questions + up to 5 unscored questions

• Time limit: 105 minutes

• Passing score: 65%

• Version: Based on the Summer ’22 release

• Registration fee: USD $200 (+ applicable taxes)

• Retake fee: USD $100 (+ applicable taxes)

• Delivery: Onsite proctored or online proctored

• Materials: No outside materials allowed

• Prerequisites: None

Tip: Candidates can provide comments and feedback on individual exam questions during the test.

Exam Outline

The Salesforce JavaScript Developer Exam measures a candidate’s knowledge and skills related to the following sections and objectives.

Variables, Types, and Collections: 23%

• Given a scenario, write code to create variables and initialize them correctly.

• Given a business requirement, utilize strings, numbers, and dates effectively.

• Given a scenario or example, demonstrate awareness of type coercion and its effects.

• Given a specific scenario, distinguish truthy or falsey evaluations.

• Given a list of data, demonstrate data manipulation with arrays.

• Given a JSON response, demonstrate how to operate the JSON object.

Objects, Functions, and Classes: 25%

• Given a business requirement, locate the best function implementation.

• Given a business requirement, apply fundamentals of object implementation to solve the business requirement.

• Given a business requirement, apply fundamentals of class implementation to solve the business requirement.

• Given a JavaScript module, give examples of how to use the module.

• Given a JavaScript decorator, give examples of how to use the decorator.

• Given a block of code, analyze the variable scope and the execution flow.

Browser and Events: 17%

• Given a business requirement, utilize Events, event handlers, and propagation.

• Given a business requirement, evaluate and manipulate the DOM.

• Given a scenario, utilize the Browser Dev Tools to investigate code behavior.

• Given a scenario and requirements, utilize browser specific APIs.

Debugging and Error Handling: 7%

• Given a scenario, handle errors properly.

• Given code to be debugged, use the console and breakpoints.

Asynchronous Programming: 13%

• Given a scenario, apply asynchronous programming concepts.

• Given a scenario, use event loop and event monitor or determine loop outcomes.

Server Side JavaScript: 8%

• Given a scenario and requirements, infer which Node.js implementation is a good solution.

• Given a scenario and requirements, infer which Node.js CLI command is a good solution.

• Know the core Node.js modules and given requirements, infer which Node.js library/framework is a good solution.

• Given a scenario and requirements, distinguish which Node.Js Package Management solution is the most fitting.

Testing: 7%

• With a block of code and the associated Unit Test, determine where the test is ineffective and modify it to make it more effective.