Certification vendors revise their exams regularly, and outdated material can quietly sink your score. Prep4sureGuide keeps the JavaScript-Developer-I日本語 question pool current with free updates for 365 days, so your Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) preparation in 2026 always reflects the latest syllabus.
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Available Languages: | English |
| Exam Format: | Multiple-select, Multiple-choice |
| Certificate Validity Period: | None (Credential does not expire) |
| Exam Price: | $200 USD |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| 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 |
| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Arrays and collections - Primitive and complex data types - Variable declarations and initialization - Type coercion and conversion - Strings, numbers, and dates - Truthy and falsy evaluations |
| Server Side JavaScript | 8% | - Package management (npm) - CLI commands - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules |
| Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test coverage and reliability - Test effectiveness evaluation |
| Browser and Events | 17% | - Browser Developer Tools usage - Event handling and listeners - DOM manipulation - Browser-specific APIs - Interacting with forms and user input - Event propagation (bubbling and capturing) |
| Objects, Functions, and Classes | 25% | - Modules and decorators - Object creation and manipulation - Variable scope and closures - Prototypal inheritance - Execution flow and context - Function declarations and expressions - ES6 classes and inheritance - Arrow functions - Higher-order functions |
| Asynchronous Programming | 13% | - Asynchronous patterns for business requirements - Event loop and execution flow - Promises (creation, chaining, error handling) - Callbacks - Async/Await syntax |
| Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Console methods for debugging - Breakpoints and code inspection - Custom error types |
The JavaScript-Developer-I日本語 exam leads to the Salesforce Developer certification, a Junior / Associate-level credential from Salesforce. It validates the skills measured by the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) syllabus and is a recognized step for IT professionals building their careers, and it sits alongside related credentials such as Salesforce Certified JavaScript Developer I Credential.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam includes 60 (plus up to 5 unscored pilot questions) questions and gives you 105 minutes to complete them. That works out to a fairly tight pace, so reading each question carefully but decisively matters more than perfectionism. If a question stalls you, flag it and move on; banking the easier points first keeps time pressure from snowballing near the end. Before test day, run at least one full timed session with the Prep4sureGuide practice test so the rhythm feels familiar rather than rushed.
You need 65% to pass the JavaScript-Developer-I日本語 exam, and the official registration fee is $200 USD. Keep in mind that a failed attempt means paying the full fee again to retake the exam, so it pays to be honest with yourself before booking a seat. A practical benchmark: work through the 149 practice questions at Prep4sureGuide until you can score comfortably above the passing line in timed mode, then schedule your exam.
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. Because Salesforce may adjust its policies over time, we recommend confirming the latest requirements on the official exam page (official exam page) before you register.
Yes. Prep4sureGuide offers a free PDF demo of the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) material, so you can review the question style and answer quality before making a decision. Every purchase also includes 365 days of free updates, and after that period you can extend your updates at a 50% discount, which keeps your preparation current through 2026 and beyond.
If you take the Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) exam within 60 days of your purchase and do not pass, Prep4sureGuide offers a full refund under its Money Back Guarantee. To apply, send a scanned copy of your exam enrollment slip together with your official Score Report in PDF format within 2 days of the exam date, and your claim will be processed within 7 days. The guarantee applies only to the corresponding exam: attempts made within 3 days of purchase, exams downloaded but never actually taken, free materials, and expired orders are not eligible, and the candidate name must match the purchaser name. If you would rather not take a refund, you can exchange your product for two additional exam preparation products of equal value and keep the update service on your original purchase. Delivery itself is instant: your product is available for download right after payment and is also sent to your email within one minute, and if it has not arrived within 2 hours, contact our support team. There is no limit on how many computers you can install it on.
The Salesforce Certified JavaScript Developer I Exam (JavaScript-Developer-I日本語版) syllabus is divided into 7 main domains, including Variables, Types, and Collections (23%), Debugging and Error Handling (7%), Testing (7%). Each domain carries a different share of the total score, so knowing where the weight sits helps you allocate your study time wisely. You will find the complete, up-to-date outline in the Exam Topics section above.
値:
true + 3 + ' 100 ' + null
Correct Answer: B 🗳️
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以下のコードを参照してください。
01 function myFunction(reassign) {
02 let x = 1;
03 var y = 1;
04
05 if (reassign) {
06 let x = 2;
07 var y = 2;
08 console.log(x);
09 console.log(y);
10 }
11
12 console.log(x);
13 console.log(y);
14 }
myFunction(true)が呼び出されたとき、何が表示されますか?
Correct Answer: B 🗳️
Explanation: Only visible for Prep4sureGuide members. You can sign-up / login (it's free).
開発者は以下を実行します。
ドキュメントクッキー;
document.cookie = ' key=John Smith ' ;
その行動とはどのようなものか?
Correct Answer: B 🗳️
開発者は、エンドポイントの1つで実行時エラーが繰り返し発生するため、Node.jsウェブサーバーのデバッグを行う必要がある。
開発者は、ローカルマシン上でエンドポイントをテストし、ローカルサーバーに対してリクエストを送信して動作を確認したいと考えています。ソースコードでは、server.jsファイルがサーバーを起動します。開発者は、ターミナルのみを使用してNode.jsサーバーのデバッグを行いたいと考えています。
開発者が現在のターミナルウィンドウでCLIデバッガーを開くには、どのコマンドを使用すればよいですか?
(タイプミスを修正済み:node_inspect # ノード検査、node_start_inspect # ノード開始検査)
Correct Answer: D 🗳️
2つの式var1とvar2が与えられたとき、2つの式を連結した結果を文字列型として返すための有効な方法を2つ挙げてください。
Correct Answer: A,C 🗳️
Explanation: Only visible for Prep4sureGuide members. You can sign-up / login (it's free).
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