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Exam Code: JavaScript-Developer-I
Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Updated: Sep 06, 2026
Q & A: 149 Questions and Answers
JavaScript-Developer-I Free Demo download
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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.
Functions (more functions in higher order)
Objects & Arrays: Data Structures
Item Model Document
Strings
Activities
Discharge
Classes
Conversion type (inclusive versus explicit)
Scope of Variables
Forms of data and operators
Control of Mistake
Asynchronous Programming
JavaScript on the backend
Modules
Monitor (agnostic platform)
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.
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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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Strings, numbers, and dates - Type coercion and conversion - Variable declarations and initialization - Primitive and complex data types - Truthy and falsy evaluations - JSON parsing and manipulation - Arrays and collections |
| Topic 2: Server Side JavaScript | 8% | - Core Node.js modules - Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals - CLI commands |
| Topic 3: Debugging and Error Handling | 7% | - Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection |
| Topic 4: Asynchronous Programming | 13% | - Event loop and execution flow - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Async/Await syntax - Callbacks |
| Topic 5: Objects, Functions, and Classes | 25% | - Higher-order functions - Prototypal inheritance - Modules and decorators - Variable scope and closures - Function declarations and expressions - Object creation and manipulation - Execution flow and context - Arrow functions - ES6 classes and inheritance |
| Topic 6: Testing | 7% | - Test coverage and reliability - Unit testing concepts - Test effectiveness evaluation - Writing and modifying unit tests |
| Topic 7: Browser and Events | 17% | - DOM manipulation - Browser Developer Tools usage - Event handling and listeners - Interacting with forms and user input - Browser-specific APIs - Event propagation (bubbling and capturing) |
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