Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developers
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Check Updated on: Oct 24, 2026
No. of Questions: 149 Questions & Answers with Exam Engine
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- Total Questions: 149
- Updated on: Oct 24, 2026
- Price: $69.00
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- Total Questions: 149
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Three versions, your choice. The Salesforce Certified JavaScript Developer - Multiple Choice materials at PremiumVCEDump come as PDF, SOFT, and APP editions, so you can study the JS-Dev-101 exam content in whichever format fits the moment — and switch whenever you like.
Salesforce JS-Dev-101 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified JavaScript Developer I Lightning Web Components Specialist Superbadge |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Exam Price: | $200 USD |
| Exam Format: | Multiple Choice, Multiple Select |
| Available Languages: | English |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online (Proctored) |
| Pre Condition: | 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. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
Salesforce JS-Dev-101 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browser and Events | 17% | - DOM manipulation - Event handling, propagation, bubbling, and capturing - Browser Developer Tools |
| Topic 2: Objects, Functions, and Classes | 25% | - Function declarations, expressions, and arrow functions - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - JavaScript modules (export, import) - Object creation, properties, and prototypal inheritance |
| Topic 3: Asynchronous Programming | 13% | - Callback patterns - Event loop and asynchronous code execution - Promises and async/await |
| Topic 4: Variables, Types, and Collections | 23% | - String manipulation and Date objects - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - Variable declaration (var, let, const, scoping, hoisting) |
| Topic 5: Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Topic 6: Server Side JavaScript | 8% | - Node.js applications - Salesforce API integration - Modules and file operations |
| Topic 7: Testing | 7% | - Automated testing strategies - Unit testing with Jest - Test-driven development principles |
JS-Dev-101 Exam FAQ: Formats, Payment, and Facts
The JS-Dev-101 exam is the official assessment behind the Salesforce Certified JavaScript Developer - Multiple Choice certification from Salesforce. In an age where technology skills need to be verifiable, a respected credential makes yours visible — it tells the market your abilities have been measured, not merely claimed. Earning it takes real preparation, and that preparation is exactly what our materials support.
Both. The JS-Dev-101 test engine works offline once you have opened it online the first time — after that initial run, your connection is optional. The PDF edition goes further for paper learners: print all of the contents and annotate them into a personal workbook. Whichever of the three versions you prefer, the Salesforce Certified JavaScript Developer - Multiple Choice content inside is the same daily-checked bank.
Plenty of them. PremiumVCEDump accepts a wide range of payment methods through a protected payment platform, so you can buy the Salesforce Certified JavaScript Developer - Multiple Choice materials whichever way is most convenient for you. Every transaction is guarded at each step — convenience and security are both part of the checkout, not a trade-off between them.
Passing the JS-Dev-101 exam requires 65%, and registration costs $200 USD. Focused preparation with verified answers is how you make that fee a one-time expense rather than a recurring one.
The official outline divides the JS-Dev-101 exam into weighted domains, including:
- Browser and Events (17%)
- Asynchronous Programming (13%)
- Variables, Types, and Collections (23%)
The Salesforce Certified JavaScript Developer - Multiple Choice bank at PremiumVCEDump is checked against these objectives every day, with new items added as the exam evolves.
The JS-Dev-101 exam contains 60 (plus up to 5 unscored pilot questions) questions with 105 minutes minutes to complete them. Timed practice under the same limit — online or offline — turns pacing into a habit before exam day.
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.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Function to test:
01 const sum3 = (arr) => {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1];
05 return arr[0] + arr[1] + arr[2];
06 };
Which two assert statements are valid tests for this function?
- A. console.assert(sum3([-3, 2]) === -1);
- B. console.assert(sum3([0]) === 0);
- C. console.assert(sum3(['hello', 2, 3, 4]) === NaN);
- D. console.assert(sum3([1, '2']) == 12);
Correct Answer: A,B 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
Which two implementations of utils.js support foo and bar?
- A. export default class {
foo() { return 'foo'; }
bar() { return 'bar'; } - B. const foo = () => { return 'foo'; };
const bar = () => { return 'bar'; };
export { foo, bar }; - C. import { foo, bar } from "./helpers/utils.js";
export { foo, bar }; - D. const foo = () => { return 'foo'; };
const bar = () => { return 'bar'; };
export default { foo, bar };
Correct Answer: B,C 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
- A. 5-5
- B. 5-10
- C. 10-5
- D. 10-10
Correct Answer: D 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
Refer to the code below:
01 let sayHello = () => {
02 console.log('Hello, World!');
03 };
Which code executes sayHello once, two minutes from now?
- A. setTimeout(sayHello, 120000);
- B. setInterval(sayHello, 120000);
- C. delay(sayHello, 120000);
- D. setTimeout(sayHello(), 120000);
Correct Answer: A 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
- A. Add a handler to the personalizeWebsiteContent script to handle the load event
- B. Add a listener to the window object to handle the load event
- C. Add a listener to the window object to handle the DOMContentLoaded event
- D. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
Correct Answer: B 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
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