Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developers
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Updated: Sep 19, 2026
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- Total Questions: 149
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Salesforce JS-Dev-101 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Developer |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Available Languages: | Japanese, English |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Exam Price: | USD 200 |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Exam Format: | Multiple choice, Multiple select |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | DOWNLOAD DEMO |
| 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 |
|---|---|---|
| Debugging and Error Handling | 7% | - Console usage, breakpoints and debugging techniques - Error types and handling strategies |
| Objects, Functions, and Classes | 25% | - ES6 classes, inheritance, modules, decorators - Function types, scope, closures, arrow functions - Object creation, properties, prototypes |
| Browser and Events | 17% | - DOM selection and manipulation - Event handling, propagation, listeners - Browser APIs and developer tools |
| Server Side JavaScript | 8% | - Node.js fundamentals and core modules - Package management and CLI tools |
| Testing | 7% | - Test coverage and improvement - Unit test structure and effectiveness |
| Variables, Types, and Collections | 23% | - Strings, numbers, dates, arrays and methods - Data types, type coercion, truthy/falsy values - JSON parsing and manipulation - Variable declaration and scope |
| Asynchronous Programming | 13% | - Event loop and execution flow - Callbacks, promises, async/await |
JS-Dev-101 Exam FAQ: Clear Answers
The official Salesforce Certified JavaScript Developer - Multiple Choice outline splits the exam into 7 domains, led by Server Side JavaScript (8%), Asynchronous Programming (13%), and Testing (7%). The complete breakdown is in the topics section above; PremiumVCEDump's 149 practice questions cover every domain listed.
A complete preparation package: 149 practice questions for the Salesforce Certified JavaScript Developer - Multiple Choice exam in three formats — a printable, expert-prepared PDF with instant download; a Desktop Test Engine for Windows that simulates the real exam with two practice modes and works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. Also included: a free demo, 365 days of free updates, a 50% renewal discount afterward, unlimited computer installations, 24-hour online customer service, and remote assistance from professional personnel when needed.
The Salesforce Certified JavaScript Developer - Multiple Choice exam includes 60 scored + up to 5 unscored to answer within 105 minutes. Rehearsing that pace in the PremiumVCEDump Desktop Test Engine turns time pressure into a familiar routine.
No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity Rules are updated occasionally, so confirm the current requirements on the official Salesforce exam page before you book.
PremiumVCEDump issues a full refund if you take the Salesforce Certified JavaScript Developer - Multiple Choice exam within 60 days of purchase and do not pass. The process is simple: submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam, and claims are processed within 7 days. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Prefer to keep studying? Exchange for two free exam products of equal value and keep your original update service. Orders arrive by email within 1 minute — contact support if nothing arrives within 2 hours.
The JS-Dev-101 exam is a Salesforce certification exam validating the knowledge in the Salesforce Certified JavaScript Developer - Multiple Choice syllabus shown above. It contributes to these credential paths: Salesforce Certified Developer, Salesforce Certified Platform Developer I. Candidates take it to prove their skills to employers in 2026's market, and PremiumVCEDump prepares them with 149 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.
Salesforce recommends these training resources for the Salesforce Certified JavaScript Developer - Multiple Choice exam:
Combine the official training with the 149 practice questions from PremiumVCEDump — that pairing reveals what you have truly absorbed.
Online proctored or onsite at authorized testing centers Register for the Salesforce Certified JavaScript Developer - Multiple Choice exam through these official channels:
After booking, your PremiumVCEDump practice questions arrive by email within 1 minute — preparation can begin immediately.
The Salesforce Certified JavaScript Developer - Multiple Choice exam requires 65% to pass, and registration costs USD 200. Retakes cost the same again, so a readiness check with the PremiumVCEDump practice engines is a worthwhile step before booking.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString && searchString.toLowerCase();
03 document.querySelectorAll('.account').forEach(account => {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */;
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
- A. 'hidden' : 'visible'
- B. 'none' : 'block'
- C. 'block' : 'none'
- D. 'visible' : 'hidden'
Correct Answer: C 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
A developer wants to use a module named universalContainerslib and then call functions from it. How should a developer import every function from the module and then call the functions foo and bar?
- A. import {foo, bar} from '/path/universalContainerslib.js';
foo();
bar(); - B. import * from '/path/universalContainerslib.js';
universalContainerslib.foo();
universalContainerslib.bar(); - C. import * as lib from '/path/universalContainerslib.js';
lib.foo();
lib.bar(); - D. import all from '/path/universalContainerslib.js';
universalContainerslib.foo();
universalContainerslib.bar();
Correct Answer: C 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?
- A. [1, 2]
- B. An error will occur due to the incorrect usage of the for_of statement on line 07.
- C. ["foo", "bar"]
- D. ["foo:1", "bar:2"]
Correct Answer: B 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
A developer initiates a server with the file server.js and adds dependencies in the source code's package.json that are required to run the server.
Which command should the developer run to start the server locally?
- A. start server.js
- B. npm start server.js
- C. node start
- D. npm start
Correct Answer: D 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
- A. Replace line 02 with button.addCallback("click", function() {
- B. Replace line 04 with console.log(input.value);
- C. Replace line 03 with const input = document.getElementByIdName('input');
- D. Replace line 02 with button.addEventListener("onclick", function() {
Correct Answer: B 🗳️
Explanation: Only visible for PremiumVCEDump members. You can sign-up / login (it's free).
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