Exam Code: JavaScript-Developer-I
Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Updated: Oct 14, 2026
Q & A: 149 Questions and Answers
JavaScript-Developer-I Free Demo download
Salesforce JavaScript-Developer-I exam focuses on testing a developer's knowledge of JavaScript and how it can be used to build custom applications on the Salesforce platform. This includes topics such as data modeling, user interface development, and integration with other systems. JavaScript-Developer-I exam is designed to be challenging, but it is also highly respected in the industry and can help developers stand out from the competition.
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Salesforce is a cloud-based software that provides customer relationship management (CRM) and other business solutions. As a widely adopted CRM platform, Salesforce offers various certifications that enable professionals to demonstrate their skills in different areas of Salesforce. Among these certifications is the Salesforce Certified JavaScript Developer I, which focuses on JavaScript and its integration with Salesforce.
Salesforce JavaScript-Developer-I certification is ideal for developers who are looking to build their skills in developing custom applications on the Salesforce platform using JavaScript. Salesforce Certified JavaScript Developer (JS-Dev-101) certification validates the candidate's knowledge of Salesforce development best practices, including how to design and implement custom user interfaces, create custom business logic using Apex, and integrate with external systems using REST and SOAP APIs.
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Salesforce JavaScript-Developer-I Certification Exam is a multiple-choice exam that consists of 60 questions, which must be completed in 105 minutes. JavaScript-Developer-I exam is administered online and can be taken from any location. The passing score for the exam is 68%, and the cost to take the exam is $200. Candidates who do not pass the exam on their first attempt can retake the exam after a waiting period of 15 days.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
| Section | Weight | Objectives |
|---|---|---|
| Server-Side JavaScript | 8% | - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime - Module system and require/import |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Variable declaration and initialization - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Truthy and falsy values |
| Testing | 7% | - Test doubles and mocks - Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions |
| Browsers and Events | 17% | - Script loading and execution order - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell - Promises and chaining - Async/await syntax |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Function definitions, parameters, and scope - Modules and imports/exports - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Closures and execution context |
Refer to the code below:
let inArray = [ [1, 2], [3, 4, 5] ];
Which two statements result in the array [1, 2, 3, 4, 5]?
(With corrected typing errors: usArray # inArray, .. # ....)
Correct Answer: A,D 🗳️
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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?
Correct Answer: A,B,C 🗳️
Explanation: Only visible for ITexamReview 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?
Correct Answer: C 🗳️
Explanation: Only visible for ITexamReview members. You can sign-up / login (it's free).
Given the code:
01 function GameConsole(name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ' ${this.name} is loading a game: ${gamename}.... ' );
07 }
08
09 function Console16bit(name) {
10 GameConsole.call(this, name);
11 }
12
13 Console16bit.prototype = Object.create(GameConsole.prototype);
14
15 // insert code here
16 console.log( ' ${this.name} is loading a cartridge game: ${gamename}.... ' );
17 }
18
19 const console16bit = new Console16bit( ' SNEGeneziz ' );
20 console16bit.load( ' Super Monic 3x Force ' );
What should a developer insert at line 15?
Correct Answer: D 🗳️
Explanation: Only visible for ITexamReview members. You can sign-up / login (it's free).
Refer to the following object:
const dog = {
firstName: ' Beau ' ,
lastName: ' Boo ' ,
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for dog?
Correct Answer: B 🗳️
Explanation: Only visible for ITexamReview members. You can sign-up / login (it's free).
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