Credit Card payment keeps your account and money safe — totally worry-free shopping. The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) VCE test engine at CertkingdomPDF: 149 practice questions for the JavaScript-Developer-I日本語 exam in 2026.
Salesforce JavaScript-Developer-I日本語 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Available Languages: | Japanese, English |
| Exam Price: | USD 200 (+ applicable taxes) |
| Exam Format: | Multiple-select, Multiple-choice |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Related Certifications: | Salesforce Certified Lightning Web Components Specialist Salesforce Certified Platform Developer I |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: |  |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Truthy and falsy values - Variable declaration and initialization - Type coercion and conversion rules |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling - Defensive programming practices |
| Testing | 7% | - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices - Unit testing concepts |
| Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Closures and execution context - Modules and imports/exports - Function definitions, parameters, and scope - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Script loading and execution order |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Async/await syntax - Callbacks and callback hell - Event loop and micro/macro tasks - Promises and chaining |
| Server-Side JavaScript | 8% | - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import |
JavaScript-Developer-I日本語 Exam FAQ — Clear the Nerves
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is Salesforce's certification exam for Salesforce Certified JavaScript Developer I, at the Intermediate / Developer level. It's demanding enough to intimidate — timed practice is the cure. Related credentials include Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist.
Yes:
After any course, build confidence with the 149 practice questions for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) — every answer expert-verified.
Through the vendor's official registration channels:
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is delivered Online proctored or onsite at authorized testing centers — pick the arrangement that suits you when booking.
105 minutes for 60 scored + up to 5 unscored questions. The CertkingdomPDF APP engine imitates the real test — set timed exams, mark performance, point out mistakes — so exam day feels rehearsed.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) blueprint spans 7 domains — including Variables, Types, and Collections (23%), Objects, Functions, and Classes (25%), Browsers and Events (17%). The complete outline above lists every subtopic; our IT staff keep the material aligned daily.
No formal prerequisites; 1–2 years of JavaScript development experience recommended Eligibility rules change over time, so verify the current requirements on the official page (official JavaScript-Developer-I日本語 exam page) before registering.
USD 200 (+ applicable taxes) per attempt, 65% to pass. Retakes cost the full fee — practice whenever you want with the 149 practice questions for the JavaScript-Developer-I日本語 exam at CertkingdomPDF.
Soon after payment you receive the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) material by automatic email — about a minute, with Credit Card payment and a strict information system keeping money and data safe; our 7*24 service replies within 2 hours, even on official holidays. If you fail the corresponding JavaScript-Developer-I日本語 exam within 60 days of purchase, we refund in full: send a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam, processed within 7 days. Excluded: exams within 3 days of purchase, candidate names that don't match the payer, and free or expired products. Or exchange for two equal-value products free.
Yes — download the free Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) demo and feel the engine before paying. Purchases include 365 days of free updates by email; renew afterward at 50% off.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
以下のコードが与えられた場合：
01 counter = 0;
02 const logCounter = () = > {
03 console.log(counter);
04 };
05 logCounter();
06 setTimeout(logCounter, 2100);
07 setInterval(() = > {
08 counter++;
09 logCounter();
10 }, 1000);
記録される最初の4つの数字は何ですか？
- A. 0012
- B. 0112
- C. 0123
- D. 0122
Correct Answer: D 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
以下のコードを参照してください。
const searchText = ' Yay! Salesforce is amazing! ' ;
let result1 = searchText.search(/sales/i);
let result2 = searchText.search(/sales/);
console.log(result1);
console.log(result2);
このコードを実行すると、コンソールにはどのような結果が表示されますか？
- A. 5
undefined - B. 5
0 - C. 5
-1 - D. true
false
Correct Answer: C 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
以下のコードを参照してください。
< html lang= " en " >
< body >
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
< /body >
< script >
function displaySaveMessage(event) {
console.log( ' Save message. ' );
}
function displaySuccessMessage(event) {
console.log( ' Success message. ' );
}
window.onload = function() {
document.querySelector( ' .secondary ' )
.addEventListener( ' click ' , displaySaveMessage, true);
document.querySelector( ' .primary ' )
.addEventListener( ' click ' , displaySuccessMessage, true);
}
< /script >
< /html >
- A. > 内部メッセージ
外部メッセージ - B. > 外部メッセージ
- C. > 内部メッセージ
- D. > 外部メッセージ
内なるメッセージ
Correct Answer: D 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
以下のコード宣言を参照してください。
let str1 = ' Java ' ;
let str2 = ' スクリプト ' ;
どの３つの式が文字列「JavaScript」を返しますか？
- A. str1.join(str2);
- B. `${str1}${str2}`
- C. str1 + str2;
- D. const({str1, str2});
- E. str1.concat(str2);
Correct Answer: B,C,E 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
以下のHTMLを前提とします。
<div>
<div id="row-uc">ユニバーサルコンテナ</div>
<div id="row-as">適用済み配送</div>
<div id="row-bt">バーリントン・テキスタイルズ</div>
</div>
どのステートメントが、適用済み配送行にpriority-account CSSクラスを追加しますか？
- A. document.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );
- B. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );
- C. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );
- D. document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' );
Correct Answer: D 🗳️
Explanation: Only visible for CertkingdomPDF members. You can sign-up / login (it's free).
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