Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) : JavaScript-Developer-I日本語

Exam Code: JavaScript-Developer-I-JPN

Exam Name: Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)

Updated: Nov 07, 2026

Q & A: 149 Questions and Answers

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About Salesforce JavaScript-Developer-I日本語 Exam

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Who should take the Salesforce JavaScript-Developer-I Exam

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:

Web application developer
UI/UX Engineer
JavaScript programmer
Support engineer
Technical Product Manager
Software/backend developer
Salesforce developer
Technical Project Manager
Front end developer
Full stack developer

Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

How to book the Salesforce JavaScript-Developer-I Exam

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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Introduction to Salesforce JavaScript Developer I Exam

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).

How to Prepare for Salesforce JavaScript Developer I Exam

Preparation Guide for Salesforce JavaScript Developer I Exam

Introduction

Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.

Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- ES6 classes and inheritance - Prototypal inheritance - Higher-order functions - Function declarations and expressions - Arrow functions - Modules and decorators - Variable scope and closures - Execution flow and context - Object creation and manipulation
Topic 2: Testing	7%	- Test coverage and reliability - Unit testing concepts - Writing and modifying unit tests - Test effectiveness evaluation
Topic 3: Variables, Types, and Collections	23%	- JSON parsing and manipulation - Arrays and collections - Truthy and falsy evaluations - Variable declarations and initialization - Primitive and complex data types - Type coercion and conversion - Strings, numbers, and dates
Topic 4: Browser and Events	17%	- Interacting with forms and user input - DOM manipulation - Browser-specific APIs - Event propagation (bubbling and capturing) - Event handling and listeners - Browser Developer Tools usage
Topic 5: Debugging and Error Handling	7%	- Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection
Topic 6: Asynchronous Programming	13%	- Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax - Callbacks - Asynchronous patterns for business requirements
Topic 7: Server Side JavaScript	8%	- Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - CLI commands - Package management (npm)

Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:

Question #1

開発者は、数値を渡すと次の値を返す FizzBuzz 関数を作成しました。
* 数字が3で割り切れる場合は「fizz」と表示されます。
* 数字が5で割り切れる場合は「ブザー」を鳴らします。
* 数字が3と5の両方で割り切れる場合は「fizzbuzz」と表示されます。
* 数値が3でも5でも割り切れない場合は、空の文字列を返します。
fizzbuzz関数のシナリオを適切にテストするテストケースはどれですか？(2つ選択)

A. let res = fizzbuzz(Infinity);
console.assert(res === ' ' );
B. let res = fizzbuzz(15);
console.assert(res === ' fizzbuzz ' );
C. let res = fizzbuzz(NaN);
console.assert(isNaN(res));
D. let res = fizzbuzz(3);
console.assert(res === ' buzz ' );

Reveal Solution Discussion 0

Correct Answer: A,B 🗳️