Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Check Updated on: Aug 25, 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
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
For more info read reference:
Salesforce JavaScript-Developer-I Certification leaning site Salesforce JavaScript-Developer-Is Certification resources
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| 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 |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Callbacks and callback hell - Async/await syntax - Promises and chaining - Event loop and micro/macro tasks |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts - Core Node.js modules |
| Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Variable declaration and initialization - JSON parsing and usage - Truthy and falsy values - Array methods and data manipulation - Working with strings, numbers, dates, and booleans |
| Objects, Functions, and Classes | 25% | - Closures and execution context - Function definitions, parameters, and scope - Object creation, properties, and methods - Modules and imports/exports - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes |
| Debugging and Error Handling | 7% | - Console methods and logging - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints |
| Testing | 7% | - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices - Unit testing concepts |
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