Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Instant Download Salesforce : JavaScript-Developer-I
Check Updated on: Aug 16, 2026
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Topics of Salesforce JavaScript Developer I Exam
Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based coding Variables Creation and Initialization JSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of events Development tools of browsers Understanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different concepts Monitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.js Understanding of Node.js CLI commands
6. Testing: 7%
Unit Testing effectiveness of different tests
What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
- There is a time limit of 105 minutes for the exam.
- This exam consists of 60 questions
- This exam is offered in only English.
- Passing score 65%
- The type of questions is Multiple Choice and situation-based questions.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browsers and Events | 17% | - Script loading and execution order - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Topic 2: Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Topic 3: Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Event loop and micro/macro tasks - Async/await syntax - Fetch API and HTTP requests |
| Topic 4: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling - Defensive programming practices |
| Topic 5: Variables, Types, and Collections | 23% | - JSON parsing and usage - Array methods and data manipulation - Variable declaration and initialization - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - Truthy and falsy values |
| Topic 6: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import - Core Node.js modules |
| Topic 7: Objects, Functions, and Classes | 25% | - Modules and imports/exports - Function definitions, parameters, and scope - Object creation, properties, and methods - Closures and execution context - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns |
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