- 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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Preparation Guide for Salesforce JavaScript Developer I Exam
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Topic 2: Debugging and Error Handling | 7% | - Console methods and logging - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints |
| Topic 3: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts - Core Node.js modules |
| Topic 4: Variables, Types, and Collections | 23% | - 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 Programming | 13% | - 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 Classes | 25% | - 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 Events | 17% | - 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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