Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Updated: Jul 23, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Earning the Salesforce Certified JavaScript Developer I certification demonstrates to potential employers and clients that a professional has the skills and knowledge required to develop and maintain custom JavaScript applications on the Salesforce platform. Salesforce Certified JavaScript Developer (JS-Dev-101) certification can lead to increased job opportunities and higher salaries for professionals in the Salesforce ecosystem. Additionally, Salesforce Certified JavaScript Developers can leverage their skills to develop innovative solutions that drive business value for their organizations.
Salesforce JavaScript-Developer-I certification is a valuable credential for developers who want to demonstrate their expertise in building custom solutions on the Salesforce platform using JavaScript. With proper preparation and study, candidates can successfully earn this certification and advance their careers in the Salesforce ecosystem.
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Salesforce JavaScript-Developer-I exam is one of the most sought-after certifications in the Salesforce ecosystem. As a Salesforce Certified JavaScript Developer I, a professional can demonstrate their expertise in building custom applications on the Salesforce platform using JavaScript. Salesforce Certified JavaScript Developer (JS-Dev-101) certification is designed for developers who possess a deep understanding of JavaScript and its related technologies.
Salesforce JavaScript-Developer-I Certification Exam consists of 60 multiple-choice questions and is a timed exam that lasts for 105 minutes. JavaScript-Developer-I exam is administered by Salesforce and can be taken either online or at a testing center. To be eligible for the exam, you must have completed the JavaScript Development on the Salesforce Platform course or have equivalent knowledge and experience. Upon passing the exam, you will earn the Salesforce Certified JavaScript Developer I certification, which is a valuable credential for developers looking to advance their careers in Salesforce development.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions - Code coverage and best practices |
| Topic 2: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Async/await syntax - Callbacks and callback hell - Promises and chaining - Event loop and micro/macro tasks |
| Topic 3: Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Modules and imports/exports - Object creation, properties, and methods - Closures and execution context |
| Topic 4: Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime |
| Topic 5: Browsers and Events | 17% | - Window and document object properties - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Script loading and execution order |
| Topic 6: Debugging and Error Handling | 7% | - Defensive programming practices - Error types and exception handling - Console methods and logging - Debugging tools and breakpoints |
| Topic 7: Variables, Types, and Collections | 23% | - Type coercion and conversion rules - JSON parsing and usage - Truthy and falsy values - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Variable declaration and initialization |
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