Study with JS-Dev-101 Actual Test Questions
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Last Updated: Sep 17, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Salesforce Certified JavaScript Developer - Multiple Choice is issued by Salesforce, one of the most respected names in the industry, and earning it in 2026 can open serious career doors. Actualtests4sure helps you get there with 149 practice questions built around the official JS-Dev-101 objectives.
Salesforce JS-Dev-101 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Exam Format: | Multiple select, Multiple choice |
| Exam Price: | USD 200 |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Exam Duration: | 105 minutes |
| Available Languages: | Japanese, English |
| Passing Score: | 65% |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Related Certifications: | Salesforce Certified Developer Salesforce Certified Platform Developer I |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity |
| Official Syllabus URL: | https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101 |
Salesforce JS-Dev-101 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Unit test structure and effectiveness - Test coverage and improvement |
| Topic 2: Objects, Functions, and Classes | 25% | - Object creation, properties, prototypes - ES6 classes, inheritance, modules, decorators - Function types, scope, closures, arrow functions |
| Topic 3: Browser and Events | 17% | - Event handling, propagation, listeners - Browser APIs and developer tools - DOM selection and manipulation |
| Topic 4: Variables, Types, and Collections | 23% | - Variable declaration and scope - JSON parsing and manipulation - Data types, type coercion, truthy/falsy values - Strings, numbers, dates, arrays and methods |
| Topic 5: Server Side JavaScript | 8% | - Node.js fundamentals and core modules - Package management and CLI tools |
| Topic 6: Debugging and Error Handling | 7% | - Error types and handling strategies - Console usage, breakpoints and debugging techniques |
| Topic 7: Asynchronous Programming | 13% | - Callbacks, promises, async/await - Event loop and execution flow |
Frequently Asked Questions About Salesforce Certified JavaScript Developer - Multiple Choice
The JS-Dev-101 exam leads to the Salesforce Certified JavaScript Developer certification, a Intermediate / Specialist-level credential from Salesforce. It validates the skills measured by the Salesforce Certified JavaScript Developer - Multiple Choice syllabus and is a recognized step for IT professionals building their careers, and it sits alongside related credentials such as Salesforce Certified Developer, Salesforce Certified Platform Developer I.
The Salesforce Certified JavaScript Developer - Multiple Choice exam includes 60 scored + up to 5 unscored 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 Actualtests4sure practice test so the rhythm feels familiar rather than rushed.
You need 65% to pass the JS-Dev-101 exam, and the official registration fee is USD 200. 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 Actualtests4sure until you can score comfortably above the passing line in timed mode, then schedule your exam.
No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity 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.
You can sign up for the Salesforce Certified JavaScript Developer - Multiple Choice exam through any of the official registration channels below:
As for how the exam is delivered: Online proctored or onsite at authorized testing centers.
Salesforce suggests the following training options for candidates preparing for Salesforce Certified JavaScript Developer - Multiple Choice:
Formal training is a solid foundation, and pairing it with the 149 practice questions from Actualtests4sure helps you turn that knowledge into exam-day confidence.
Yes. Actualtests4sure offers a free PDF demo of the Salesforce Certified JavaScript Developer - Multiple Choice 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 - Multiple Choice exam within 60 days of your purchase and do not pass, Actualtests4sure 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 - Multiple Choice syllabus is divided into 7 main domains, including Server Side JavaScript (8%), Variables, Types, and Collections (23%), Objects, Functions, and Classes (25%). 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.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing "Leo" to "The Lion"?
- A. document.querySelector('#main li:second-child').innerHTML = 'The Lion';
- B. document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion';
- C. document.querySelectorAll('#main li,Leo').innerHTML = 'The Lion';
- D. document.querySelectorAll('#main #Leo').innerHTML = 'The Lion';
Correct Answer: B 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after execution?
- A. [1,2,3,4,5,4,4]
- B. [1,2,3,4,5,4]
- C. [1,2,3,4,4,5,4]
- D. [1,2,3,5]
Correct Answer: D 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?
- A. let numberValue = (number) textValue;
- B. let numberValue = textValue.toInteger();
- C. let numberValue = Integer(strNumber);
- D. let numberValue = Number(strNumber);
Correct Answer: D 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
Given a value, which three options can a developer use to detect if the value is NaN?
- A. value !== value
- B. value === Number.NaN
- C. Number.isNaN(value)
- D. Object.is(value, NaN)
- E. value == NaN
Correct Answer: A,C,D 🗳️
A team at Universal Containers works on a big project and uses Yarn to deal with the project's dependencies. A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?
- A. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
- B. The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
- C. The developer missed the option --save when adding the dependency.
- D. The developer missed the option --add when adding the dependency.
Correct Answer: A 🗳️
Explanation: Only visible for Actualtests4sure members. You can sign-up / login (it's free).
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