Exam Code: JavaScript-Developer-I-JPN
Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
Updated: Jul 24, 2026
Q & A: 149 Questions and Answers
JavaScript-Developer-I日本語 Free Demo download
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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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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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
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| Section | Weight | Objectives |
|---|---|---|
| Browsers and Events | 17% | - Window and document object properties - Event handling, propagation, and delegation - Script loading and execution order - Document Object Model (DOM) manipulation - Browser APIs and Web Storage |
| Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Unit testing concepts - Testing frameworks and assertions |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Async/await syntax - Fetch API and HTTP requests - Event loop and micro/macro tasks |
| Objects, Functions, and Classes | 25% | - Closures and execution context - Object creation, properties, and methods - Function definitions, parameters, and scope - Modules and imports/exports - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns |
| Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Array methods and data manipulation - Variable declaration and initialization - Truthy and falsy values - JSON parsing and usage - Working with strings, numbers, dates, and booleans |
| Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts |
| Debugging and Error Handling | 7% | - Error types and exception handling - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging |
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