Salesforce JavaScript-Developer-I : 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 28, 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

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

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Introduction to Salesforce JavaScript Developer I Exam

The credential Salesforce Accredited JavaScript Developer I is meant for applicants who build JavaScript applications for the web stack on the front-end and/or back-end.This validates both key JavaScript expertise and functional skills for applicants, for example, Lightning Components Platform, and Lightning Web Component technology relevant to JavaScript. Lightning web elements are personalised HTML elements that are designed with traditional HTML and modern JavaScript.

The Salesforce JavaScript Developer I certification requires two parts: the multiple-choice test given by the JavaScript Developer I and the Superbadge Lightning Web Components. In any order, all these credentials can be accessed. A Salesforce Certified Javascript Developer I certification is immediately obtained by adding these two certificates. The qualification applicant for Salesforce JavaScript Accredited Developer I will use the JavaScript language to build front-end or back-end software in one or more frameworks. The applicant will plan, build and evaluate effective , safe and reusable solutions.

The candidate can use JavaScript-specific programming style patterns and can use CSS , HTML, and other languages for integrating JavaScript. With Lightning Web Components, any JavaScript developer can build on Salesforce easily. This means that millions of JavaScript developers around the world will code on Salesforce without learning anything new. Developers can create and deploy brand-new fast apps on Salesforce using the current Lightning Platform development services portfolio and the modern JavaScript language. Salesforce JavaScript Developer I Certificate from Salesforce is designed to help Salesforce partners, customers and employees working on JavaScript as well as the Lightning Component Platform, know-how and knowledge and creation of Lightning web components (LWC's).

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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