Salesforce JavaScript-Developer-I Q&A - in .pdf

  • JavaScript-Developer-I pdf
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 06, 2026
  • Q & A: 149 Questions and Answers
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  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
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  • Updated: Aug 06, 2026
  • Q & A: 149 Questions and Answers
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Salesforce JavaScript-Developer-I Q&A - Testing Engine

  • JavaScript-Developer-I Testing Engine
  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Aug 06, 2026
  • Q & A: 149 Questions and Answers
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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

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What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
  • The type of questions is Multiple Choice and situation-based questions.
  • This exam is offered in only English.
  • There is a time limit of 105 minutes for the exam.
  • Passing score 65%
  • This exam consists of 60 questions

Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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