Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Updated: Sep 12, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Earning the Salesforce Certified JavaScript Developer I certification demonstrates a candidate's proficiency in developing custom applications using JavaScript in Salesforce. Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) certification is a valuable asset for individuals seeking to advance their careers in Salesforce development or for organizations looking to hire skilled Salesforce developers. Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) certification also provides access to the Salesforce Certified Community, which offers networking opportunities, exclusive resources, and ongoing support for Salesforce developers.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I日本語 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: Browsers and Events | 17% | - Browser APIs and Web Storage - Script loading and execution order - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation |
| Topic 3: Variables, Types, and Collections | 23% | - JSON parsing and usage - Type coercion and conversion rules - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Variable declaration and initialization |
| Topic 4: Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Promises and chaining - Callbacks and callback hell - Async/await syntax - Fetch API and HTTP requests |
| Topic 5: Objects, Functions, and Classes | 25% | - Modules and imports/exports - Decorators and advanced function patterns - Closures and execution context - Object creation, properties, and methods - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes |
| Topic 6: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import - Core Node.js modules |
| Topic 7: Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
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