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

JavaScript-Developer-I Exam Questions
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 19, 2026
  • Q & A: 149 Questions and Answers
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About Salesforce JavaScript-Developer-I Exam Guide

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 is offered in only English.
  • Passing score 65%
  • The type of questions is Multiple Choice and situation-based questions.
  • This exam consists of 60 questions

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

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How to book the Salesforce JavaScript-Developer-I Exam

There are the following steps for registering the Salesforce JavaScript Developer I exam. Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Browsers and Events17%- Browser APIs and Web Storage
- Event handling, propagation, and delegation
- Document Object Model (DOM) manipulation
- Window and document object properties
- Script loading and execution order
Topic 2: Objects, Functions, and Classes25%- Decorators and advanced function patterns
- Function definitions, parameters, and scope
- Modules and imports/exports
- Class syntax, inheritance, and prototypes
- Object creation, properties, and methods
- Closures and execution context
Topic 3: Asynchronous Programming13%- Callbacks and callback hell
- Fetch API and HTTP requests
- Promises and chaining
- Async/await syntax
- Event loop and micro/macro tasks
Topic 4: Debugging and Error Handling7%- Console methods and logging
- Defensive programming practices
- Debugging tools and breakpoints
- Error types and exception handling
Topic 5: Server-Side JavaScript8%- Command-line tools and scripts
- Node.js fundamentals and runtime
- Module system and require/import
- Core Node.js modules
Topic 6: Variables, Types, and Collections23%- Working with strings, numbers, dates, and booleans
- Variable declaration and initialization
- Array methods and data manipulation
- Type coercion and conversion rules
- JSON parsing and usage
- Truthy and falsy values
Topic 7: Testing7%- Code coverage and best practices
- Unit testing concepts
- Testing frameworks and assertions
- Test doubles and mocks

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