Every unsuccessful attempt at the JavaScript-Developer-I日本語 exam costs another full registration fee, not to mention weeks of lost momentum. Before risking that, candidates throughout 2026 are validating their readiness with the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) practice questions from ActualCollection.
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 Format: | Multiple-select, Multiple-choice |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Exam Price: | USD 200 (+ applicable taxes) |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | DOWNLOAD DEMO |
| 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 |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Error types and exception handling - Debugging tools and breakpoints - Console methods and logging - Defensive programming practices |
| Topic 2: Browsers and Events | 17% | - Script loading and execution order - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation |
| Topic 3: Objects, Functions, and Classes | 25% | - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Closures and execution context - Object creation, properties, and methods - Function definitions, parameters, and scope - Modules and imports/exports |
| Topic 4: Server-Side JavaScript | 8% | - Module system and require/import - Command-line tools and scripts - Core Node.js modules - Node.js fundamentals and runtime |
| Topic 5: Testing | 7% | - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions - Code coverage and best practices |
| Topic 6: Variables, Types, and Collections | 23% | - Variable declaration and initialization - JSON parsing and usage - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Array methods and data manipulation |
| Topic 7: Asynchronous Programming | 13% | - Async/await syntax - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell - Promises and chaining |
JavaScript-Developer-I日本語 (Salesforce) Exam FAQs: What Candidates Ask Most
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is an official Salesforce exam, registered under the code JavaScript-Developer-I日本語. A passing score earns you the Salesforce Certified JavaScript Developer I certification, positioned at the Intermediate / Developer level. The credential also connects to Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist, so it can anchor a broader certification path. Because Salesforce designs its exams around real job tasks, holding this certification signals practical skill rather than memorized theory.
Candidates face 60 scored + up to 5 unscored questions inside a 105 minutes window on the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam. That ratio leaves little slack, which is why pacing deserves as much practice as the content itself. Learn to budget your minutes, park stubborn questions instead of wrestling them, and rehearse under a real clock: a few timed runs in the ActualCollection test engine will make the official time limit feel routine rather than threatening.
The passing bar for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is set at 65%, and registering for the exam officially costs USD 200 (+ applicable taxes). There is no reduced price for a second try: fail, and you pay USD 200 (+ applicable taxes) in full again. That makes honest self-testing the cheapest insurance available, so hold off on booking until your ActualCollection practice scores sit clearly above the passing line, attempt after attempt.
No formal prerequisites; 1–2 years of JavaScript development experience recommended
Vendor policies are revised from time to time, so double-check the eligibility details before registering on the official exam page.
Sign-up for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam is handled through the official registration channels listed here.
One practical detail: the exam is delivered Online proctored or onsite at authorized testing centers, so plan your logistics accordingly.
Salesforce recommends the following training resources for candidates working toward Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版).
Training gives you the theory, but repetition locks it in. Pair any course with the 149 practice questions in the ActualCollection JavaScript-Developer-I日本語 package and you will know exactly how each topic shows up on exam day.
Absolutely. A free PDF demo of the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) questions is available at ActualCollection, so you can inspect the quality and formatting before any money changes hands. Once you buy, updates are free for 365 days, and when that period runs out you can extend the update service at 50% off the regular price.
ActualCollection offers a 100% money-back guarantee with specific conditions. If you take the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam within 60 days of purchase and fail, you may claim a full refund, provided the exam matches your product. Sitting the exam within 3 days of purchase disqualifies a claim, as do downloaded-but-unused products, free materials, and expired orders; the candidate name must also match the payer name. To file, submit a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and the claim is processed within 7 days. If you prefer, you can skip the refund and instead receive two other exam products of equal value at no charge while keeping the update service on your original purchase.
As for delivery: it is immediate. Your files become downloadable the moment payment completes and are also emailed to you within one minute. If nothing shows up within 2 hours, contact customer service. You may install the software on an unlimited number of computers.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is divided into 7 official domains. Among the headline areas are Testing (7%), Browsers and Events (17%), and Objects, Functions, and Classes (25%). Scroll up to the exam topics section for the full breakdown, and use it as a checklist: any line you cannot confidently explain deserves another round of practice.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
以下の2つのコードスニペットのうち、再帰関数の動作例を示しているのはどれですか？
- A. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
} - B. let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} それ以外 {
開始番号を返します。
}
};
(注：オプションDは、小文字の改行と対応する括弧を用いた正しい構文で示されています。) - C. const sumToTen = numVar = > {
if (numVar < 0)
戻る;
return sumToTen(numVar + 1);
}; - D. const factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
Correct Answer: B,D 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
以下のHTMLを参照してください。
< div id= " main " >
< ul >
< li > Leo < /li >
< li > Tony < /li >
< li > Tiger < /li >
< /ul >
< /div >
JavaScriptのどの文で「Leo」が「The Lion」に変更されますか？
- A. document.querySelectorAll( ' #main li,Leo ' ).innerHTML = ' The Lion ' ;
- B. document.querySelector( ' #main li:nth-child(1) ' ).innerHTML = ' The Lion ' ;
- C. document.querySelectorAll( ' #main #Leo ' ).innerHTML = ' The Lion ' ;
- D. document.querySelector( ' #main li:second-child ' ).innerHTML = ' The Lion ' ;
Correct Answer: B 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
開発者が、後方互換性を損なわない新機能を追加したパッケージの新バージョンを公開しました。以前のバージョン番号は1.1.3でした。
セマンティックバージョニングの形式に従うと、新しいパッケージのバージョン番号は何になるべきでしょうか？
- A. 1.2.3
- B. 2.0.0
- C. 1.2.0
- D. 1.1.4
Correct Answer: C 🗳️
Explanation: Only visible for ActualCollection 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 let first = ' Who ' ;
02 let second = ' What ' ;
03 try {
04 try {
05 throw new Error( ' Sad trombone ' );
06 } catch (err) {
07 first = ' Why ' ;
08 throw err;
09 } finally {
10 second = ' When ' ;
11 }
12 } catch (err) {
13 second = ' Where ' ;
14 }
コード実行後、firstとsecondの値はどうなりますか？
- A. 最初は「誰が」、2番目は「どこで」です。
- B. 1つ目は「なぜ」、2つ目は「いつ」です。
- C. 1つ目は「なぜ」、2つ目は「どこ」です。
- D. 1番目は「誰が」、2番目は「いつ」です。
Correct Answer: C 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
以下の項目について最も正確な検査を実施します。
const arr = Array(5).fill(0);
- A. arr.forEach(e = > console.assert(e === 0));
- B. console.assert(arr[5] === 0 & & arr.length === 0);
- C. console.assert(arr.length === 5);
- D. console.assert(arr.length === 0);
Correct Answer: A,C 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
