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

  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 09, 2026
  • Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam

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

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How to Prepare for Salesforce JavaScript Developer I Exam

Preparation Guide for Salesforce JavaScript Developer I Exam

Introduction

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What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam

  • Passing score 65%
  • This exam is offered in only English.
  • This exam consists of 60 questions
  • There is a time limit of 105 minutes for the exam.
  • 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:

SectionObjectives
Topic 1: Testing and Debugging- Debugging techniques and tools
- Unit testing principles
Topic 2: Salesforce Platform Integration- Calling Apex methods from JavaScript
- Lightning Web Components (LWC) JavaScript usage
- Security considerations in Salesforce JavaScript
Topic 3: JavaScript Language Fundamentals- Functions, scope, and closures
- Data types, variables, and operators
- ES6+ syntax and features
Topic 4: Browser and DOM Interaction- Event handling and propagation
- DOM manipulation and traversal
- Browser APIs (fetch, storage, timers)
Topic 5: Asynchronous JavaScript- Event loop and concurrency model
- Promises and async/await
- Error handling in async workflows

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