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

JavaScript-Developer-I Exam Simulator
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 15, 2026
  • Q & A: 149 Questions and Answers
  • Salesforce JavaScript-Developer-I Q&A - in .pdf

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How much Salesforce JavaScript-Developer-I Exam Cost

The price of the Salesforce JavaScript Developer I certification is $200 USD, for more information related to the Salesforce JavaScript-Developer-I Exam please visit Salesforce website.

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

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

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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