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

  • Exam Code: JavaScript-Developer-I
  • Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
  • Updated: Jul 28, 2026
  • Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I Exam Questions

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How to Study the Salesforce JavaScript-Developer-I Exam

The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.

  • Activities

  • Functions (more functions in higher order)

  • JavaScript on the backend

  • Objects & Arrays: Data Structures

  • Modules

  • Monitor (agnostic platform)

  • Scope of Variables

  • Discharge

  • Strings

  • Forms of data and operators

  • Control of Mistake

  • Item Model Document

  • Asynchronous Programming

  • Classes

  • Conversion type (inclusive versus explicit)

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.

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

Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional

Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:

  • United State - 129,630 USD
  • England - 60,200 POUND
  • Europe - 63,500 Euro

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

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Asynchronous Programming13%- Callbacks
- Async/Await syntax
- Asynchronous patterns for business requirements
- Event loop and execution flow
- Promises (creation, chaining, error handling)
Browser and Events17%- Event handling and listeners
- Interacting with forms and user input
- Event propagation (bubbling and capturing)
- Browser-specific APIs
- DOM manipulation
- Browser Developer Tools usage
Server Side JavaScript8%- CLI commands
- Node.js fundamentals
- Core Node.js modules
- Package management (npm)
- Server-side JavaScript implementations
Variables, Types, and Collections23%- Arrays and collections
- Primitive and complex data types
- JSON parsing and manipulation
- Strings, numbers, and dates
- Variable declarations and initialization
- Truthy and falsy evaluations
- Type coercion and conversion
Debugging and Error Handling7%- Console methods for debugging
- Custom error types
- Breakpoints and code inspection
- Error handling techniques (try/catch/finally)
Objects, Functions, and Classes25%- Prototypal inheritance
- Object creation and manipulation
- Higher-order functions
- Arrow functions
- ES6 classes and inheritance
- Variable scope and closures
- Function declarations and expressions
- Execution flow and context
- Modules and decorators
Testing7%- Test coverage and reliability
- Test effectiveness evaluation
- Unit testing concepts
- Writing and modifying unit tests

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