Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developers
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- Total Questions: 149
- Updated on: Oct 08, 2026
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- Total Questions: 149
- Updated on: Oct 08, 2026
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JS-Dev-101 PDF Practice Q&A's
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- Total Questions: 149
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Updated: Oct 08, 2026
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Some candidates try crowded classroom courses and find the schedule impossible. For them, TestKingFree offers a self-paced alternative built around Salesforce Certified JavaScript Developer - Multiple Choice practice questions, so 149 targeted Q&As on TestKingFree fit around the JS-Dev-101 exam day.
Salesforce JS-Dev-101 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented JavaScript | - Objects and Prototypes - Classes and Inheritance |
| Topic 2: JavaScript Fundamentals | - Variables, Data Types, and Operators - Functions and Scope - Control Flow and Error Handling |
| Topic 3: Browser and DOM Interaction | - Events and Event Handling - DOM Manipulation |
| Topic 4: Asynchronous Programming | - Callbacks, Promises, and Async/Await - API Calls and Data Fetching |
| Topic 5: Salesforce Platform Integration | - Working with Salesforce Data Models - Lightning Web Components (LWC) Basics |
Frequently Asked Questions About JS-Dev-101 Preparation
Salesforce Trailhead - JavaScript Developer I: Visit official page
MDN Web Docs - JavaScript Guide: Visit official page
No formal prerequisites, but familiarity with JavaScript and web development is recommended.
The JS-Dev-101 exam contains 60 (multiple choice) questions and lasts 105 minutes minutes, so pacing matters as much as knowledge. Practicing under a real timer on TestKingFree helps you learn how long to spend on each item.
The Salesforce Certified JavaScript Developer - Multiple Choice material is written by a group of IT experts and certified trainers. Beyond assembling verified questions, they organize the bank into a study strategy for candidates, so you always know which section to tackle next instead of paging through questions at random.
The online engine recreates the atmosphere of the formal test, so the real JS-Dev-101 exam feels familiar rather than intimidating. It runs on Windows, Mac, Android, and iOS, places no limit on the number of installations, and lets you review at any time and from any location, which fits naturally around an IT worker's schedule.
The passing score of JS-Dev-101 is 65%, and the official exam fee is $200 USD. Knowing both numbers early helps you set a concrete target before you book the test.
This package includes 149 practice questions for the JS-Dev-101 exam. Every answer has been verified by our IT experts and certified trainers before release.
- Browser and DOM Interaction ()
- Asynchronous Programming ()
- JavaScript Fundamentals ()
Study the sections in the order that matches your weakest areas first.
Salesforce Certification Registration: register for JS-Dev-101
Kryterion Webassessor (Exam Delivery): register for JS-Dev-101
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Refer to the code:
01 const event = new CustomEvent(
02 // Missing code
03 );
04 obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options can be inserted at line 02?
- A. 'update', { detail: { recordId: '123abc' } }
- B. { type: 'update', recordId: '123abc' }
- C. 'update', '123abc'
- D. 'update', { recordId: '123abc' }
Correct Answer: A,D 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
A developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
- A. Executes server-side JavaScript code to avoid learning a new language.
- B. Performs a static analysis on code before execution to look for runtime errors.
- C. Installs with its own package manager to install and manage third-party libraries.
- D. Ensures stability with one major release every few years.
- E. Uses non-blocking functionality for performant request handling.
Correct Answer: A,C,E 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
- A. window.location
- B. __dirname
- C. this.path
- D. __filename
Correct Answer: B 🗳️
Explanation: Only visible for TestKingFree 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. Object.is(value, NaN)
- D. Number.isNaN(value)
- E. value == NaN
Correct Answer: A,C,D 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
Refer to the code below:
01 x = 3.14;
02
03 function myFunction() {
04 'use strict';
05 y = x;
06 }
07
08 z = x;
09 myFunction();
Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?
- A. Line 05 throws an error.
- B. z is equal to 3.14.
- C. 'use strict' is hoisted, so it has an effect on all lines.
- D. 'use strict' has an effect only on line 05.
- E. 'use strict' has an effect between line 04 and the end of the file.
Correct Answer: A,B,D 🗳️
Explanation: Only visible for TestKingFree members. You can sign-up / login (it's free).
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