Every candidate studies differently, so ExamTorrent offers the JavaScript-Developer-I practice questions as a printable PDF, a desktop test engine, and an online test engine. All three cover the same 149 questions for the Salesforce Certified JavaScript Developer (JS-Dev-101) exam.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Real Exam Qty: | 60 |
| Exam Price: | USD 200 (may vary by region/tax) |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Platform App Builder Salesforce Certified JavaScript Developer I |
| Exam Duration: | 105 minutes |
| Available Languages: | English |
| Exam Format: | Multiple Choice, Multiple Select |
| Recommended Training: | Salesforce Developer Learning Paths Salesforce Trailhead JavaScript Developer I Prep |
| Exam Registration: | Salesforce Certification Registration (Webassessor) Salesforce Credentials Page |
| Sample Questions: |  |
| 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 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| JavaScript Language Fundamentals | - Functions, scope, and closures - ES6+ syntax and features - Data types, variables, and operators |
| Salesforce Platform Integration | - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage |
| Asynchronous JavaScript | - Event loop and concurrency model - Error handling in async workflows - Promises and async/await |
| Browser and DOM Interaction | - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) - Event handling and propagation |
| Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
Everything You Want to Know About the Salesforce JavaScript-Developer-I Exam
The JavaScript-Developer-I exam (Salesforce Certified JavaScript Developer (JS-Dev-101)) is the official Salesforce exam that leads to the JavaScript Developer I certification, a credential at the Professional level. Related certifications include Salesforce Certified Platform Developer I, Salesforce Certified Platform App Builder, Salesforce Certified JavaScript Developer I. ExamTorrent provides 149 practice questions to help you prepare for it with confidence.
The JavaScript-Developer-I exam contains 60 questions and gives you 105 minutes to finish them. Before exam day, divide the total time by the question count so you know the pace you need to keep, and flag difficult items instead of getting stuck on them. Running at least one full timed session in the ExamTorrent test engine is the best way to make that time pressure feel familiar.
You need 65% to pass, and the official registration fee is USD 200 (may vary by region/tax). Keep in mind that a failed attempt means paying that fee in full again, so it pays to test yourself first. When your scores on the ExamTorrent timed practice tests stay consistently above the passing line, you are ready to book the exam.
No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. Requirements can change over time, so always double-check the latest eligibility rules before you register on the official Salesforce exam page.
You can book your exam through the official registration channels:
The exam is delivered in the following way: Online proctored or onsite testing via Kryterion Webassessor.
Salesforce recommends the following training options for this exam:
Official courses build the foundation, and the JavaScript-Developer-I practice questions from ExamTorrent help you turn that knowledge into exam-day performance.
Yes. ExamTorrent offers a free JavaScript-Developer-I PDF demo so you can check the quality of the practice questions before purchasing. After you buy, your product comes with 365 days of free updates, and if it expires you can renew the update service at a 50% discount from your member zone.
Your purchase is protected by our 100% Money Back Guarantee. If you take the corresponding JavaScript-Developer-I exam within 60 days of purchase and do not pass, send us a scan of your enrollment slip and the official Score Report PDF within two days of the exam, and the full refund will be processed within seven days. The candidate name must match the payer name; exams taken within three days of purchase, free materials, and expired orders are not eligible. If you would rather not refund, you can exchange your product for two free products of equal value and keep the update service on your original purchase. Delivery itself is instant: your material is available for download and is emailed to you within one minute of payment. If nothing arrives within two hours, contact our support team. There is no limit on how many computers you may install it on.
The JavaScript-Developer-I syllabus is organized into 5 exam domains. Among the first three are Browser and DOM Interaction, Asynchronous JavaScript, Testing and Debugging. For the complete breakdown of topics and subtopics, see the Exam Topics section above.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02
03 alert( ' Hey! I am John Doe ' );
04
05 }
06 button.addEventListener( ' click ' , listen);
Which two code lines make this code work as required?
- A. On line 04, use event.stopPropagation();
- B. On line 04, use button.removeEventListener( ' click ' , listen);
- C. On line 06, add an option called once to button.addEventListener().
- D. On line 02, use event.first to test if it is the first execution.
Correct Answer: B,C 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given the following code:
let x = ( ' 15 ' + 10) * 2;
What is the value of x?
- A. 50
- B. 3020
- C. 35
- D. 1520
Correct Answer: B 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Refer to the code below:
< html >
< body >
< div id= " logo " > Hello Logo! < /div >
< button id= " test " > Click me < /button >
< /body >
< script >
function printMessage(event) {
console.log( ' This is a test message ' );
}
let el = document.getElementById( ' test ' );
el.addEventListener( " click " , printMessage, false);
< /script >
< /html >
Which action should be done?
- A. Add event.stopPropagation(); to printMessage function
- B. Add event.removeEventListener(); to printMessage function
- C. Add event.removeEventListener(); to window.onload event handler
- D. Add event.stopPropagation(); to window.onload event handler
Correct Answer: A 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?
- A. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
} - B. server.catch((error) = > {
console.log( ' ERROR ' , error);
}); - C. server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
}); - D. server.error((error) = > {
console.log( ' ERROR ' , error);
});
Correct Answer: C 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
Given two expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is data type string?
- A. String.concat(var1 + var2)
- B. String(var1).concat(var2)
- C. var1 + var2
- D. var1.toString() + var2.toString()
Correct Answer: B,D 🗳️
Explanation: Only visible for ExamTorrent members. You can sign-up / login (it's free).
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