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

JavaScript-Developer-I real exams

Exam Code: JavaScript-Developer-I

Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)

Updated: Jul 22, 2026

Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam Questions

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  • Forms of data and operators

  • Control of Mistake

  • Activities

  • Item Model Document

  • Objects & Arrays: Data Structures

  • Modules

  • Functions (more functions in higher order)

  • Classes

  • Scope of Variables

  • Conversion type (inclusive versus explicit)

  • Strings

  • Discharge

  • Asynchronous Programming

  • Monitor (agnostic platform)

  • JavaScript on the backend

To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.

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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.
  • The type of questions is Multiple Choice and situation-based questions.
  • There is a time limit of 105 minutes for the exam.
  • 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
Topic 1: Variables, Types, and Collections23%- Type coercion and conversion rules
- Working with strings, numbers, dates, and booleans
- JSON parsing and usage
- Variable declaration and initialization
- Truthy and falsy values
- Array methods and data manipulation
Topic 2: Asynchronous Programming13%- Callbacks and callback hell
- Event loop and micro/macro tasks
- Promises and chaining
- Async/await syntax
- Fetch API and HTTP requests
Topic 3: Objects, Functions, and Classes25%- Modules and imports/exports
- Function definitions, parameters, and scope
- Class syntax, inheritance, and prototypes
- Decorators and advanced function patterns
- Closures and execution context
- Object creation, properties, and methods
Topic 4: Browsers and Events17%- Script loading and execution order
- Document Object Model (DOM) manipulation
- Browser APIs and Web Storage
- Window and document object properties
- Event handling, propagation, and delegation
Topic 5: Debugging and Error Handling7%- Console methods and logging
- Debugging tools and breakpoints
- Defensive programming practices
- Error types and exception handling
Topic 6: Testing7%- Code coverage and best practices
- Unit testing concepts
- Test doubles and mocks
- Testing frameworks and assertions
Topic 7: Server-Side JavaScript8%- Command-line tools and scripts
- Module system and require/import
- Core Node.js modules
- Node.js fundamentals and runtime

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