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Salesforce JS-Dev-101 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Duration: | 105 minutes |
| Related Certifications: | Salesforce Certified JavaScript Developer I Lightning Web Components Specialist Superbadge |
| Passing Score: | 65% |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Exam Format: | Multiple Select, Multiple Choice |
| Sample Questions: |  |
| 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: Server Side JavaScript | 8% | - Modules and file operations - Salesforce API integration - Node.js applications |
| Topic 2: Testing | 7% | - Unit testing with Jest - Automated testing strategies - Test-driven development principles |
| Topic 3: Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Topic 4: Asynchronous Programming | 13% | - Callback patterns - Event loop and asynchronous code execution - Promises and async/await |
| Topic 5: Browser and Events | 17% | - DOM manipulation - Event handling, propagation, bubbling, and capturing - Browser Developer Tools |
| Topic 6: Objects, Functions, and Classes | 25% | - Higher-order functions and closures - ES6 Classes, constructors, methods, and inheritance - Object creation, properties, and prototypal inheritance - Function declarations, expressions, and arrow functions - JavaScript modules (export, import) |
| Topic 7: Variables, Types, and Collections | 23% | - JSON parsing and stringification - String manipulation and Date objects - Variable declaration (var, let, const, scoping, hoisting) - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) |
JS-Dev-101 Exam FAQ
The Salesforce Certified JavaScript Developer - Multiple Choice exam requires a score of 65% to pass, and the official registration fee is $200 USD. Knowing both numbers before you register keeps your preparation budget realistic.
The Salesforce Certified JavaScript Developer - Multiple Choice practice questions are organized around the official exam objectives. Key topics include:
- Variables, Types, and Collections (23%)
- Browser and Events (17%)
- Debugging and Error Handling (7%)
A systematic pass through these topics covers the syllabus end to end.
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.
You can confirm the current eligibility requirements on the official JS-Dev-101 exam page before you register.
Our experts review the question bank every day, and whenever a new version is released, our system sends it to your email automatically — no request needed. If an update ever seems to go missing, check your junk or spam folder first, since automated messages occasionally land there; contact us if it truly never arrived.
The Salesforce Certified JavaScript Developer - Multiple Choice exam contains 60 (plus up to 5 unscored pilot questions) questions, and you will have 105 minutes minutes to complete them. Practicing under these exact constraints makes the real exam feel like one more rehearsal.
Yes. If anything about the updated material or your preparation is unclear, you can contact our experts directly after purchase. They will work through your question and offer professional advice on how to approach the material, so the product comes with guidance, not just files.
This package includes 149 practice questions for the Salesforce Certified JavaScript Developer - Multiple Choice exam. Every answer is verified by an experienced team of experts, so you can trust what you study.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Refer to the following code:
01 class Ship {
02 constructor(size) {
03 this.size = size;
04 }
05 }
06
07 class FishingBoat extends Ship {
08 constructor(size, capacity){
09 //Missing code
10 this.capacity = capacity;
11 }
12 displayCapacity() {
13 console.log('The boat has a capacity of ${this.capacity} people.');
14 }
15 }
16
17 let myBoat = new FishingBoat('medium', 10);
18 myBoat.displayCapacity();
Which statement should be added to line 09 for the code to display
The boat has a capacity of 10 people?
- A. super(size);
- B. this.size = size;
- C. super.size = size;
- D. ship.size = size;
Correct Answer: A 🗳️
Explanation: Only visible for GuideTorrent members. You can sign-up / login (it's free).
A developer implements a function that adds a few values.
function sum(num1, num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num1 + num2 + num3;
}
Which three options can the developer invoke for this function to get a return value of 10?
- A. sum(5)(5);
- B. sum(10, 0);
- C. sum()(10);
- D. sum(5, 5, 0);
- E. sum(5, 2, 3);
Correct Answer: B,D,E 🗳️
Explanation: Only visible for GuideTorrent members. You can sign-up / login (it's free).
Refer to the code:
const pi = 3.1415926;
What is the data type of pi?
- A. Decimal
- B. Double
- C. Number
- D. Float
Correct Answer: C 🗳️
Explanation: Only visible for GuideTorrent members. You can sign-up / login (it's free).
A team at Universal Containers works on a big project and uses yarn to manage 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 --add when adding the dependency.
- D. The developer missed the option --save when adding the dependency.
Correct Answer: A 🗳️
Explanation: Only visible for GuideTorrent 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. 10-5
- B. 5-10
- C. 5-5
- D. 10-10
Correct Answer: D 🗳️
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