Download Salesforce : JavaScript-Developer-I Questions & Answers as PDF & Test Software
Last Updated: Sep 16, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
Download Limit: Unlimited
Reliable & Actual Study Materials for JavaScript-Developer-I Exam Success
Our Online Test Engine & Self Test Software of TestSimulate JavaScript-Developer-I actual study materials can simulate the exam scene so that you will have a good command of writing speed and time. Then multiple practices make you perfect while in the real Salesforce JavaScript-Developer-I exam. The package practice version will not only provide you high-quality JavaScript-Developer-I exam preparation materials but also various studying ways.
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Salesforce JavaScript-Developer-I Practice Q&A's
- Printable JavaScript-Developer-I PDF Format
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Salesforce JavaScript-Developer-I Self Test Engine
- Installable Software Application
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The Salesforce Certified JavaScript Developer (JS-Dev-101) exam has a reputation for rewarding candidates who prepare with the right material. With 149 carefully compiled practice questions, TestSimulate helps you turn the JavaScript-Developer-I syllabus into something you can genuinely master.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Exam Format: | Multiple-select, Multiple-choice |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Available Languages: | Japanese, English |
| Exam Price: | USD 200 (+ applicable taxes) |
| Exam Duration: | 105 minutes |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Async/await syntax - Callbacks and callback hell - Promises and chaining - Fetch API and HTTP requests |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Type coercion and conversion rules - Truthy and falsy values - JSON parsing and usage - Variable declaration and initialization - Working with strings, numbers, dates, and booleans |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts - Core Node.js modules |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Closures and execution context - Modules and imports/exports |
| Browsers and Events | 17% | - Window and document object properties - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order |
| Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions - Unit testing concepts |
Common Questions About the Salesforce JavaScript-Developer-I Exam, Answered
The JavaScript-Developer-I exam, officially titled Salesforce Certified JavaScript Developer (JS-Dev-101), is the qualifying exam for the Salesforce Certified JavaScript Developer I certification, which sits at the Intermediate / Developer level. Earning it shows employers that you have the skills the credential stands for, and it is a solid step forward on a Salesforce career path. It also connects to Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist, so the effort you put in now keeps paying off as you advance.
The JavaScript-Developer-I exam gives you 60 scored + up to 5 unscored questions to complete within 105 minutes. Do the math before exam day: divide the total time by the question count to set a steady per-question pace, and flag any item that stalls you so you can return to it after securing the easier points. The most reliable way to build that rhythm is a full timed practice test under the same limit, which is exactly what TestSimulate's test engines are designed for.
The passing score for Salesforce Certified JavaScript Developer (JS-Dev-101) is 65%, and the official registration fee is USD 200 (+ applicable taxes). Keep in mind that a retake means paying that fee again in full, which makes an honest self-check worthwhile: before you book, sit a timed practice test and make sure you are consistently scoring above the passing line with some margin to spare.
According to the official requirements: No formal prerequisites; 1–2 years of JavaScript development experience recommended. Eligibility rules do change from time to time, so confirm the current details on the official exam page before you register.
Registration for the JavaScript-Developer-I exam is handled through the official channels below:
The exam is delivered in the following format: Online proctored or onsite at authorized testing centers. Pick a date that leaves room for at least one full timed practice test beforehand.
Salesforce recommends the following official training options for candidates preparing for Salesforce Certified JavaScript Developer (JS-Dev-101):
Courses build the foundation, but they work best alongside question practice. That is where TestSimulate comes in: the 149 practice questions in our JavaScript-Developer-I package let you rehearse the exam format at your own pace and see exactly where you stand.
Yes — TestSimulate offers a free PDF demo of the Salesforce Certified JavaScript Developer (JS-Dev-101) material, so you can review the question style and answer quality before you spend anything. After purchase, you also receive 365 days of free updates, and if your product expires you can extend the update service at a 50% discount from your member zone.
If you take the corresponding exam within 60 days of your purchase and do not pass, you are covered by the 100% Money Back Guarantee under clear conditions. To claim a full refund, submit a scan of your exam enrollment slip and your official Score Report PDF within two days of the exam; requests are processed within seven days. Note that sitting the exam within three days of purchase is not eligible, purchases that were never followed by an exam sitting do not qualify, free materials and expired orders are excluded, and the candidate name must match the payer name. Prefer an exchange instead? You can swap your product for two free exam packages of equal value and keep your update service. Delivery is immediate: your JavaScript-Developer-I material is ready for instant download and is also emailed to you within one minute of payment — contact customer service if nothing arrives within two hours. There is no limit on the number of computers you can install it on.
The current Salesforce Certified JavaScript Developer (JS-Dev-101) syllabus is organized into 7 exam domains. The first three are:
- Asynchronous Programming (13%)
- Debugging and Error Handling (7%)
- Browsers and Events (17%)
For the full domain and subtopic breakdown, see the Exam Topics section above — that is the outline your TestSimulate practice questions are mapped to.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = {value: 10};
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result after the code executes?
- A. low
- B. undefined
- C. 5
- D. 10
Correct Answer: C 🗳️
Explanation: Only visible for TestSimulate 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?
- A. let numberValue = (number) textValue;
- B. let numberValue = textValue.toInteger();
- C. let numberValue = Integer(strNumber);
- D. let numberValue = Number(strNumber);
Correct Answer: D 🗳️
Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById( ' carSpeed ' );
06 debugger;
07 let fourWheels = new Car(carSpeed.value, ' red ' );
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console?
- A. The values of the carSpeed and fourWheels variables
- B. The style, event listeners and other attributes applied to the carSpeed DOM element
- C. A variable displaying the number of instances created for the Car object
- D. The information stored in the window.localStorage property
Correct Answer: B,D 🗳️
Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).
A developer removes the HTML class attribute from the checkout button, so now it is simply:
< button > Checkout < /button >
There is a test to verify the existence of the checkout button, however it looks for a button with class= " blue "
. The test fails because no such button is found.
Which type of test category describes this test?
- A. False negative
- B. False positive
- C. True positive
- D. True negative
Correct Answer: B 🗳️
Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).
Refer to the code below:
flag();
function flag() {
console.log( ' flag ' );
}
const anotherFlag = () = > {
console.log( ' another flag ' );
}
anotherFlag();
What is result of the code block?
- A. The console logs only ' flag ' .
- B. An error is thrown.
- C. The console logs ' flag ' and then an error is thrown.
- D. The console logs ' flag ' and ' another flag ' .
Correct Answer: D 🗳️
Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).
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