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Updated: Nov 04, 2026
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Salesforce JavaScript-Developer-I Certification leaning site Salesforce JavaScript-Developer-Is Certification resources
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.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JavaScript-Developer-I日本語 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Exam Format: | Multiple-select, Multiple-choice |
| Exam Duration: | 105 minutes |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Passing Score: | 65% |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Certificate Validity Period: | None (Credential does not expire) |
| Sample Questions: | Salesforce JavaScript-Developer-I日本語 Sample Questions |
| Exam Way: | Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) |
| Pre Condition: | None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
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).
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Browser and Events | 17% | - Browser-specific APIs - Event propagation (bubbling and capturing) - Interacting with forms and user input - DOM manipulation - Event handling and listeners - Browser Developer Tools usage |
| Objects, Functions, and Classes | 25% | - Prototypal inheritance - Modules and decorators - ES6 classes and inheritance - Arrow functions - Object creation and manipulation - Variable scope and closures - Function declarations and expressions - Higher-order functions - Execution flow and context |
| Server Side JavaScript | 8% | - CLI commands - Server-side JavaScript implementations - Package management (npm) - Core Node.js modules - Node.js fundamentals |
| Debugging and Error Handling | 7% | - Console methods for debugging - Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Custom error types |
| Variables, Types, and Collections | 23% | - Primitive and complex data types - Type coercion and conversion - Variable declarations and initialization - Strings, numbers, and dates - JSON parsing and manipulation - Arrays and collections - Truthy and falsy evaluations |
| Testing | 7% | - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability |
| Asynchronous Programming | 13% | - Event loop and execution flow - Async/Await syntax - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Callbacks |
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
以下のコードを参照してください。
01 let o = {
02 get js() {
03 let city1 = String( ' St. Louis ' );
04 let city2 = String( ' New York ' );
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
開発者は、o.js.secondCityを参照することでどのような価値を期待できるのでしょうか？
- A. ' New York '
- B. undefined
- C. An error
- D. ' new york '
Correct Answer: D 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
以下のコードが与えられた場合：
01 const delay = async delay = > {
02 return new Promise((resolve, reject) = > {
03 console.log(1);
04 setTimeout(resolve, delay);
05 });
06 };
07
08 const callDelay = async () = > {
09 console.log(2);
10 const yup = await delay(1000);
11 console.log(3);
12 };
13
14 console.log(4);
15 callDelay();
16 console.log(5);
コンソールには何がログ出力されますか？
- A. 4 5 1 2 3
- B. 4 2 1 5 3
- C. 4 2 1 5 3
- D. 1 4 2 3 5
Correct Answer: B 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
開発者は、ニュース記事には本文、著者、閲覧数が必要であるという要件に基づいて、ニュース記事を表すクラスを作成します。コードは以下のとおりです。
01 class Story {
02 // Insert code here
03 this.body = body;
04 this.author = author;
05 this.viewCount = viewCount;
06 }
07 }
3つの属性が正しく設定されたStoryの新しいインスタンスを変数に設定できるようにするには、2行目のプレースホルダーにどのステートメントを挿入すればよいですか？
- A. function Story(body, author, viewCount) {
- B. constructor(body, author, viewCount) {
- C. コンストラクタ() {
- D. super(body, author, viewCount) {
Correct Answer: B 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
以下のオブジェクトを参照してください。
01 const cat = {
02 firstName: ' Fancy ' ,
03 lastName: ' Whiskers ' ,
04 get fullName(){
05 return this.firstName + ' ' + this.lastName;
06 }
07 };
開発者はどのようにして猫の fullName プロパティにアクセスできますか？
- A. cat.fullName
- B. cat.get.fullName
- C. cat.function.fullName()
- D. cat.fullName()
Correct Answer: A 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
以下のコードを参照してください。
01 新しい Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 解決(分数);
05 })
06 .then(() = > console.log( ' 解決済み ' ))
07 .catch((error) => console.error(error))
08 .finally(() => console.log('いつ呼び出されますか？'));
8行目のPromise.finallyはいつ呼び出されますか？
- A. 解決または拒否された場合
- B. 解決時
- C. 解決され、確定したとき
- D. 拒否された場合
Correct Answer: A 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
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