Salesforce JavaScript-Developer-I : Salesforce Certified JavaScript Developer (JS-Dev-101)

JavaScript-Developer-I real exams

Exam Code: JavaScript-Developer-I

Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)

Updated: Jul 21, 2026

Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam

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Salesforce JavaScript-Developer-I exam is designed to test the skills and knowledge of developers who specialize in JavaScript development on the Salesforce platform. Salesforce Certified JavaScript Developer (JS-Dev-101) certification is perfect for developers who want to demonstrate their expertise in building custom applications using JavaScript on the Salesforce platform. JavaScript-Developer-I exam covers a variety of topics, including Apex, Visualforce, and Lightning Web Components, and is designed to test a developer's ability to design, develop, and maintain custom applications on the Salesforce platform.

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Salesforce JavaScript-Developer-I exam is a certification for JavaScript developers who specialize in building custom applications on the Salesforce platform. JavaScript-Developer-I exam is designed to test a candidate's knowledge of JavaScript programming concepts, as well as their ability to develop custom applications using the Salesforce Lightning Platform.

The Salesforce Certified JavaScript Developer (JS-Dev-101) certification exam comprises 60 multiple-choice questions that must be completed in 105 minutes. JavaScript-Developer-I exam is available in both English and Japanese languages, and the passing score is 68%. Candidates who pass the JavaScript-Developer-I Certification Exam will receive a Salesforce Certified JavaScript Developer I credential. Salesforce Certified JavaScript Developer (JS-Dev-101) certification is valid for two years, after which the candidate must pass the exam again to maintain their certification status.

Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Debugging and Error Handling7%- Debugging tools and breakpoints
- Error types and exception handling
- Console methods and logging
- Defensive programming practices
Topic 2: Browsers and Events17%- Browser APIs and Web Storage
- Event handling, propagation, and delegation
- Script loading and execution order
- Window and document object properties
- Document Object Model (DOM) manipulation
Topic 3: Server-Side JavaScript8%- Command-line tools and scripts
- Node.js fundamentals and runtime
- Module system and require/import
- Core Node.js modules
Topic 4: Testing7%- Test doubles and mocks
- Testing frameworks and assertions
- Code coverage and best practices
- Unit testing concepts
Topic 5: Asynchronous Programming13%- Promises and chaining
- Async/await syntax
- Event loop and micro/macro tasks
- Fetch API and HTTP requests
- Callbacks and callback hell
Topic 6: Objects, Functions, and Classes25%- Modules and imports/exports
- Decorators and advanced function patterns
- Closures and execution context
- Object creation, properties, and methods
- Function definitions, parameters, and scope
- Class syntax, inheritance, and prototypes
Topic 7: Variables, Types, and Collections23%- Variable declaration and initialization
- Truthy and falsy values
- JSON parsing and usage
- Type coercion and conversion rules
- Working with strings, numbers, dates, and booleans
- Array methods and data manipulation

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