Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Updated: Jul 29, 2026
No. of Questions: 149 Questions & Answers
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How to Prepare for Salesforce JavaScript Developer I Exam
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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- United State - 129,630 USD
- Europe - 63,500 Euro
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Console methods and logging - Defensive programming practices - Error types and exception handling |
| Testing | 7% | - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions - Code coverage and best practices |
| Browsers and Events | 17% | - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties - Script loading and execution order |
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime |
| Asynchronous Programming | 13% | - Async/await syntax - Promises and chaining - Callbacks and callback hell - Event loop and micro/macro tasks - Fetch API and HTTP requests |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Closures and execution context - Class syntax, inheritance, and prototypes - Modules and imports/exports - Object creation, properties, and methods - Decorators and advanced function patterns |
| Variables, Types, and Collections | 23% | - Variable declaration and initialization - Truthy and falsy values - Array methods and data manipulation - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - JSON parsing and usage |
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