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

JavaScript-Developer-I
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 18, 2026
  • Q & A: 149 Questions and Answers

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

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