Last week, I took my JavaScript-Developer-I exam and passed it.
Passed yesterday with 97%
Exam Code: JavaScript-Developer-I
Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Updated: Oct 05, 2026
Q & A: 149 Questions and Answers
JavaScript-Developer-I Free Demo download
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There are the following steps for registering the Salesforce JavaScript Developer I exam. Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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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:
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The price of the Salesforce JavaScript Developer I certification is $200 USD, for more information related to the Salesforce JavaScript-Developer-I Exam please visit Salesforce website.
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Array methods and data manipulation - Type coercion and conversion rules - Variable declaration and initialization - Truthy and falsy values |
| Topic 2: Browsers and Events | 17% | - Window and document object properties - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage - Script loading and execution order |
| Topic 3: Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts |
| Topic 4: Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Promises and chaining - Async/await syntax - Callbacks and callback hell - Fetch API and HTTP requests |
| Topic 5: Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Modules and imports/exports - Object creation, properties, and methods - Decorators and advanced function patterns - Closures and execution context |
| Topic 6: Debugging and Error Handling | 7% | - Console methods and logging - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints |
| Topic 7: Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Code coverage and best practices - Unit testing concepts |
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