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Salesforce JS-Dev-101 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Browser and Events | 17% | - Browser Developer Tools - Event handling, propagation, bubbling, and capturing - DOM manipulation |
| Testing | 7% | - Test-driven development principles - Unit testing with Jest - Automated testing strategies |
| Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Server Side JavaScript | 8% | - Node.js applications - Modules and file operations - Salesforce API integration |
| Variables, Types, and Collections | 23% | - Array manipulation (map, filter, reduce, forEach, find) - Type coercion and type conversion - JSON parsing and stringification - Variable declaration (var, let, const, scoping, hoisting) - String manipulation and Date objects |
| Asynchronous Programming | 13% | - Event loop and asynchronous code execution - Callback patterns - Promises and async/await |
| Objects, Functions, and Classes | 25% | - Function declarations, expressions, and arrow functions - Higher-order functions and closures - ES6 Classes, constructors, methods, and inheritance - Object creation, properties, and prototypal inheritance - JavaScript modules (export, import) |
Salesforce JS-Dev-101 Exam Q&A for 2026 Candidates
Yes. GetValidTest provides a free PDF demo of the JS-Dev-101 practice questions, so you can check the format and quality before paying anything. Every purchase also includes 365 days of free updates, and once that period expires you can extend the update service at a 50% discount from your member zone.
The JS-Dev-101 exam gives you 105 minutes to work through 60 (plus up to 5 unscored pilot questions) questions, so the clock moves faster than most candidates expect. Keep a steady pace on every item, flag the ones that stall you, and circle back with the time you have banked instead of getting stuck. Time pressure is mostly a rehearsal problem: run at least one full timed mock in the GetValidTest test engine before your appointment, and the real countdown will feel familiar rather than threatening.
The JS-Dev-101 exam — officially titled Salesforce Certified JavaScript Developer - Multiple Choice — is the Salesforce test you pass to earn the Salesforce Developers certification. It sits at the Elementary level of the Salesforce certification program. Related certifications include Salesforce Certified JavaScript Developer I, Lightning Web Components Specialist Superbadge. If that is the credential you are after, the 149 practice questions at GetValidTest map directly to its official objectives.
The Salesforce Certified JavaScript Developer - Multiple Choice blueprint is organized into 7 domains. The first three are:
- Debugging and Error Handling (7%)
- Variables, Types, and Collections (23%)
- Server Side JavaScript (8%)
The complete, current topic list appears in the exam outline section above — review it before you start drilling the GetValidTest practice questions.
Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam.
Eligibility rules do change, so confirm the current requirements on the official exam page before you apply: https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi.
If you take the corresponding JS-Dev-101 exam within 60 days of purchase and do not pass, you can apply for a full refund under our money-back guarantee. Send a scanned copy of your exam enrollment slip together with the official Score Report PDF within 2 days of your exam date, and your claim will be processed within 7 days. Keep in mind that the candidate name must match the purchaser name, and the guarantee does not cover attempts made within 3 days of purchase, materials that were downloaded but never used in an actual exam sitting, free resources, or expired orders. If you would rather keep studying, you can swap the refund for two free exam products of equal value while keeping the update service on your original purchase. Delivery itself is instant: the files are emailed to you within one minute of payment (if nothing arrives within 2 hours, check your spam folder and contact our support team), and there is no limit on how many computers you install them on.
The passing score for the JS-Dev-101 exam is 65%, and the official registration fee is $200 USD. Remember that an unsuccessful attempt means paying the full $200 USD again to retake it, so booking too early is the expensive way to find out you are not ready. Test yourself with the GetValidTest practice questions first; once you can clear 65% comfortably on timed runs, scheduling the real exam becomes a much safer bet.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = "Username available";
return msg;
}
}
- A. undefined
- B. "newUserName"
- C. "Username available"
- D. "msg is not defined"
Correct Answer: C 🗳️
Explanation: Only visible for GetValidTest members. You can sign-up / login (it's free).
Refer to the following code:
<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. > Inner message
Outer message - B. > Outer message
Inner message - C. > Inner message
- D. > Outer message
Correct Answer: B 🗳️
Explanation: Only visible for GetValidTest members. You can sign-up / login (it's free).
01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?
- A. The m variable is assigned the correct object.
- B. The m variable is assigned the correct object but this.name remains undefined.
- C. window.name is assigned to 'hello' and the variable m remains undefined.
- D. window.m is assigned the correct object.
Correct Answer: C 🗳️
Explanation: Only visible for GetValidTest members. You can sign-up / login (it's free).
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
01 console.time('Performance');
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three functions?
- A. console.timeLog()
- B. console.getTime()
- C. console.trace()
- D. console.timeStamp()
Correct Answer: A 🗳️
Explanation: Only visible for GetValidTest members. You can sign-up / login (it's free).
A developer wants to use a try...catch statement to catch any error that countSheep() may throw and pass it to a handleError() function.
What is the correct implementation of the try...catch?
- A. try {
countSheep();
} finally {
handleError(e);
} - B. setTimeout(function() {
try {
countSheep();
} catch (e) {
handleError(e);
}
}, 1000); - C. try {
setTimeout(function() {
countSheep();
}, 1000);
} catch (e) {
handleError(e);
} - D. try {
countSheep();
} handleError (e){
catch(e);
}
Correct Answer: B 🗳️
Explanation: Only visible for GetValidTest members. You can sign-up / login (it's free).
