Try and practice the latest Salesforce : JavaScript-Developer-I日本語 real questions & answers
Last Updated: Sep 04, 2026
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Salesforce JavaScript-Developer-I日本語 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Exam Price: | USD 200 (may vary by region/tax) |
| Exam Format: | Multiple Select, Multiple Choice |
| Real Exam Qty: | 60 |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Platform App Builder Salesforce Certified JavaScript Developer I |
| Exam Duration: | 105 minutes |
| Available Languages: | English |
| Passing Score: | 65% |
| Recommended Training: | Salesforce Trailhead JavaScript Developer I Prep Salesforce Developer Learning Paths |
| Exam Registration: | Salesforce Credentials Page Salesforce Certification Registration (Webassessor) |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online proctored or onsite testing via Kryterion Webassessor |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper1 |
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Asynchronous JavaScript | - Promises and async/await - Error handling in async workflows - Event loop and concurrency model |
| Topic 2: Browser and DOM Interaction | - Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) |
| Topic 3: Salesforce Platform Integration | - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript |
| Topic 4: JavaScript Language Fundamentals | - ES6+ syntax and features - Functions, scope, and closures - Data types, variables, and operators |
| Topic 5: Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
Frequently Asked Questions About Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版)
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam (exam code JavaScript-Developer-I日本語) is the official Salesforce exam that leads to the JavaScript Developer I certification, sitting at the Professional level of the Salesforce certification track. It is also connected with Salesforce Certified Platform Developer I, Salesforce Certified Platform App Builder, Salesforce Certified JavaScript Developer I. If this is the credential you are working toward, the 149 practice questions at Actual4Cert map directly to its objectives.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam includes 60 questions, and you have 105 minutes to complete them. Divide the time limit by the question count and you get a tight average pace per item, so train yourself to flag time-consuming questions and return to them later instead of getting stuck. Before test day, run at least one full timed session in the Actual4Cert test engine under the same limits — the clock should never surprise you.
The passing score for Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) is 65%, and the official registration fee is USD 200 (may vary by region/tax). A failed attempt means paying that fee in full again, so your preparation budget deserves the same attention as your study plan. A practical rule: book your exam date only after you can finish a Actual4Cert practice test comfortably above the passing score more than once.
According to Salesforce, candidates should meet the following before registering: No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended.. Requirements can change, so confirm the latest details on the official exam page before you register.
You can register for the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam through the official channels below:
Exam delivery: Online proctored or onsite testing via Kryterion Webassessor.
Salesforce lists the following official training options for this exam:
Formal training builds the theory; pair it with the 149 practice questions from Actual4Cert to find out whether you are genuinely ready for the exam.
Yes. A free PDF demo of the JavaScript-Developer-I日本語 practice questions is available to download, so you can judge the format and quality before paying anything. Every purchase also includes 365 days of free updates, and if your product expires you can extend the update service at a 50% discount.
Your order is covered by a conditional 100% money-back guarantee: if you take the corresponding exam within 60 days of purchase and do not pass, you may apply for a full refund. Exams taken within 3 days of purchase are not eligible, nor are free materials or expired orders, and the candidate name must match the payer name. To claim, submit a scanned enrollment slip and your official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Prefer to keep studying? You can instead exchange your purchase for two free products of equal value while keeping the update service on your original one. Delivery itself is immediate: your product unlocks for instant download right after payment and a copy is emailed to you within a minute — if nothing arrives within 2 hours, contact our support team. There is no limit on the number of computers you can install it on.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) blueprint is divided into 5 major domains, starting with Browser and DOM Interaction, Asynchronous JavaScript, and Testing and Debugging. The full breakdown, including every subdomain and its weighting, is listed in the Exam Topics section above — review it against your own weak areas before scheduling the exam.
Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) Sample Questions:
Question 1
元のコード:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) = > {
04 handleResponse(response);
05 });
開発者は、PromiseベースのGETリクエストで発生するエラーを適切に処理したいと考えています。
どのコード修正が正しいですか？
A. requestPromise().then(...) の前後に try/catch ブロックを記述
B. Promiseチェーンに.catchを追加する
C. エラーにはfinallyハンドラを使用する
D. (Aの複製)
Question 2
01 function Animal(size, type) {
02 this.type = type || ' Animal ' ;
03 this.canTalk = false;
04 }
05
06 Animal.prototype.speak = function() {
07 if (this.canTalk) {
08 console.log( " It spoke! " );
09 }
10 };
11
12 let Pet = function(size, type, name, owner) {
13 Animal.call(this, size, type);
14 this.size = size;
15 this.name = name;
16 this.owner = owner;
17 }
18
19 Pet.prototype = Object.create(Animal.prototype);
20 let pet1 = new Pet();
上記のコードに基づいて、pet1に設定されている3つのプロパティはどれですか？
A. 名前
B. canTalk
C. タイプ
D. 話す
E. 所有者
Question 3
開発者は、新しいユーザー名を登録しようとするユーザーにメッセージを返すために、以下のコードを作成します。ユーザー名が利用可能な場合、3行目でmsgという名前の変数が宣言され、値が割り当てられます。
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = "ユーザー名が利用可能です";
msgを返します。
}
}
A. " newUserName "
B. undefined
C. " Username available "
D. " msg is not defined "
Question 4
ユーザー受け入れテストの後、開発者はユーザーの位置情報に基づいてウェブページの背景を変更するよう求められます。開発者のコンピューターでは正常に動作しますが、テスターのマシンでは動作しません。
正確な結果を得るために役立つ2つの行動はどれですか？
A. テスターはブラウザのキャッシュを無効にする必要があります。
B. 開発者はブラウザの更新設定を確認する必要があります。
C. 開発者はコードを修正する必要があります。
D. テスターはブラウザのキャッシュをクリアする必要があります。
Question 5
以下のコードブロックを参照してください。
01 let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
02 let output = 0;
03
04 for (let num of array) {
05 if (output > 10) {
06 break;
07 }
08 if (num % 2 == 0) {
09 continue;
10 }
11 output += num;
12 }
コード実行後の出力値は何ですか？
A. 16
B. 11
C. 25
D. 36
Solutions:
| Question 1 Answer: B | Question 2 Answer: A,B,C | Question 3 Answer: C | Question 4 Answer: A,D | Question 5 Answer: A |
Moses
Raymond
Tobias
Abigail
Camille
Eleanore
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