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About the Salesforce JavaScript Developer I CredentialThe Salesforce Certified JavaScript Developer I Credential is designed for individuals with experience in developing front-end and back-end JavaScript applications for web environments. These skills apply to a variety of frameworks and are not specific to mobile or device platforms.This credential assesses core JavaScript knowledge as well as practical development skills needed to work with technologies like the Lightning Component framework, including Lightning Web Components (LWC). LWCs are custom HTML elements built using standard HTML and modern JavaScript.The certification includes two components: the JavaScript Developer I proctored multiple-choice exam and the Lightning Web Components Specialist Superbadge. These components can be completed in any order. The exam focuses on JavaScript fundamentals, while the superbadge evaluates hands-on skills in building Lightning Web Components. Completing both components earns the Salesforce Certified JavaScript Developer I credential.Who Should Pursue This Credential?The Salesforce Certified JavaScript Developer I certification is aimed at individuals who use JavaScript in one or more frameworks to develop front-end and back-end applications. These candidates design, build, and test solutions that are efficient, maintainable, and reusable.Candidates for this certification are proficient in JavaScript-specific programming patterns and can integrate JavaScript with CSS, HTML, and other markup languages. They can effectively leverage the Lightning Platform to create and deploy applications using the modern JavaScript language and Lightning Web Components.This certification is relevant for Salesforce partners, customers, and employees who have experience with JavaScript and the Lightning Component framework, including developing LWCs.Typical roles suited for this certification include:JavaScript ProgrammerSalesforce DeveloperFull Stack DeveloperWeb Application DeveloperFront-End DeveloperSoftware/Back-End DeveloperSupport EngineerTechnical Product/Project ManagerUI/UX EngineerAbout the ExamThe JavaScript Developer I certification exam is a widely recognized credential in the JavaScript domain. It is intended for individuals with 1-2 years of experience developing JavaScript applications for web environments. The exam confirms core JavaScript development skills required for working with JavaScript technologies.A key feature of the LWC programming model is its use of standard JavaScript, making it accessible for developers with existing JavaScript expertise. By passing the exam, candidates demonstrate their proficiency in JavaScript fundamentals and their ability to develop Lightning Web Components.Key Details about the Exam:Format: 60 multiple-choice/multiple-select questions, plus up to 5 non-scored questionsDuration: 105 minutesPassing Score: 65%Registration Fee: $200 (plus applicable taxes)Retake Fee: $100 (plus applicable taxes)Delivery: Proctored exam available at testing centers or onlineReferences: No materials (hard-copy or online) are allowed during the examPrerequisites: NoneCandidates can also provide feedback on individual questions during the exam.Exam OutlineThe Salesforce JavaScript Developer I 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.

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