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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 |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified JavaScript Developer I Lightning Web Components Specialist Superbadge |
| Available Languages: | English |
| Exam Price: | $200 USD |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Format: | Multiple Select, Multiple Choice |
| Certificate Validity Period: | Lifetime (No renewal required) |
| 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: Variables, Types, and Collections | 23% | - String manipulation and Date objects - Variable declaration (var, let, const, scoping, hoisting) - Type coercion and type conversion - JSON parsing and stringification - Array manipulation (map, filter, reduce, forEach, find) |
| Topic 2: Browser and Events | 17% | - Browser Developer Tools - DOM manipulation - Event handling, propagation, bubbling, and capturing |
| Topic 3: Testing | 7% | - Unit testing with Jest - Automated testing strategies - Test-driven development principles |
| Topic 4: Asynchronous Programming | 13% | - Event loop and asynchronous code execution - Promises and async/await - Callback patterns |
| Topic 5: Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Topic 6: Server Side JavaScript | 8% | - Salesforce API integration - Modules and file operations - Node.js applications |
| Topic 7: Objects, Functions, and Classes | 25% | - Object creation, properties, and prototypal inheritance - ES6 Classes, constructors, methods, and inheritance - JavaScript modules (export, import) - Function declarations, expressions, and arrow functions - Higher-order functions and closures |
FAQ: Preparing for Salesforce Certified JavaScript Developer - Multiple Choice the Smart Way
Salesforce Certified JavaScript Developer - Multiple Choice is an official exam run by Salesforce under exam code JS-Dev-101. Passing it awards the Salesforce Developers certification, which sits at the Elementary tier. It also counts toward related credentials such as Salesforce Certified JavaScript Developer I, Lightning Web Components Specialist Superbadge. Certified professionals remain in shorter supply than the market wants, which is precisely why this exam keeps showing up in conversations about better roles and better pay.
The Salesforce Certified JavaScript Developer - Multiple Choice exam gives you 105 minutes to work through 60 (plus up to 5 unscored pilot questions) questions. That is a tight ratio, and it punishes candidates who get emotionally attached to any single item. The fix is mechanical: answer what you know, flag what you do not, and keep moving. A few full-length timed runs in the Actual4Exams test engine, with its randomized question order, will calibrate your pace far better than untimed reading ever could.
The official fee for Salesforce Certified JavaScript Developer - Multiple Choice is $200 USD, and 65% is what passing takes. The uncomfortable part: retakes cost the full $200 USD again, which makes preparation the cheapest line item in this whole project. Before booking, put yourself through repeated scored sessions with the Actual4Exams practice tests and compare results over time; a stable margin above the passing line, not a single lucky run, is when you are ready.
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.
Vendor rules do get revised, so treat this as your starting point and confirm the current eligibility details before booking via the official exam page.
It is. Actual4Exams publishes a free PDF demo of the Salesforce Certified JavaScript Developer - Multiple Choice material, so the product can prove itself before you pay. Your purchase then comes with 365 days of free updates, and once that period ends, extending the update service costs 50% of the regular price. The test engine software itself is verified malware-free and safe to install.
Actual4Exams stands behind the product with a 100% money-back guarantee under defined conditions. If you take the Salesforce Certified JavaScript Developer - Multiple Choice exam within 60 days of purchase and fail, you qualify for a full refund, provided the exam corresponds to your product. Sitting the exam within 3 days of purchase does not qualify, and neither do unused downloads, free materials, or expired orders; the candidate name must match the payer name. Submit a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and claims are resolved within 7 days. You may also choose an exchange instead of a refund: two other exam products of equal value, free, with the update service on your original purchase retained.
Delivery takes about a minute. Files unlock for instant download at payment and are emailed to you automatically; if 2 hours pass with nothing received, check spam and contact customer service. There is no installation limit, so the test engine can live on every device you own, phone included.
Salesforce Certified JavaScript Developer - Multiple Choice breaks down into 7 official domains, led by Browser and Events (17%), Objects, Functions, and Classes (25%), and Testing (7%). You will find the full topic-by-topic outline above on this page; use the weightings to budget your study hours where they pay back the most.
Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:
Question 1
Given a value, which two options can a developer use to detect if the value is NaN?
A. isNaN(value)
B. value === Number.NaN
C. value == NaN
D. Object.is(value, NaN)
Question 2
A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02
03 alert('Hey! I am John Doe');
04
05 }
06 button.addEventListener('click', listen);
Which two code lines make this code work as required?
A. On line 02, use event.first to test if it is the first execution.
B. On line 04, use event.stopPropagation();
C. On line 06, add an option called once to button.addEventListener().
D. On line 04, use button.removeEventListener('click', listen);
Question 3
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?
A. import DatePrettyPrint() from '/path/DatePrettyPrint.js';
printDate();
B. import DatePrettyPrint from '/path/DatePrettyPrint.js';
DatePrettyPrint.printDate();
C. import printDate from '/path/DatePrettyPrint.js';
DatePrettyPrint.printDate();
D. import printDate from '/path/DatePrettyPrint.js';
printDate();
Question 4
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
A. "object"
B. "null"
C. "undefined"
D. "x"
Question 5
Given:
const str = 'Salesforce';
Which two statements result in 'Sales'?
A. str.substring(1, 5);
B. str.substring(0, 5);
C. str.substr(1, 5);
D. str.substr(0, 5);
Solutions:
| Question 1 Answer: A,D | Question 2 Answer: C,D | Question 3 Answer: D | Question 4 Answer: A | Question 5 Answer: B,D |
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