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: Sep 15, 2026
  • Q&As: 149 Questions and Answers

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About Salesforce Certified JavaScript Developer (JS-Dev-101) Exam Braindumps

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Who should take the Salesforce JavaScript-Developer-I Exam

This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:

  • Support engineer
  • Front end developer
  • Web application developer
  • Software/backend developer
  • UI/UX Engineer
  • Technical Product Manager
  • JavaScript programmer
  • Technical Project Manager
  • Salesforce developer
  • Full stack developer

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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.

  • Asynchronous Programming

  • Conversion type (inclusive versus explicit)

  • Discharge

  • Scope of Variables

  • Monitor (agnostic platform)

  • Item Model Document

  • Objects & Arrays: Data Structures

  • Classes

  • Modules

  • Strings

  • Forms of data and operators

  • Activities

  • Functions (more functions in higher order)

  • Control of Mistake

  • 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.

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).

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

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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