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Salesforce JavaScript-Developer-I : Salesforce Certified JavaScript Developer (JS-Dev-101)
- Exam Code: JavaScript-Developer-I
- Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
- Updated: Oct 07, 2026
- Q & A: 149 Questions and Answers
Career plans survive contact with reality when the steps are concrete. Step one: download the free JavaScript-Developer-I demo from VCETorrent. Step two: work through 149 practice questions. The rest follows.
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Asynchronous Programming | 13% | - Callbacks and callback hell - Async/await syntax - Event loop and micro/macro tasks - Promises and chaining - Fetch API and HTTP requests |
| Topic 2: Variables, Types, and Collections | 23% | - Variable declaration and initialization - Truthy and falsy values - Type coercion and conversion rules - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Array methods and data manipulation |
| Topic 3: Testing | 7% | - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts - Code coverage and best practices |
| Topic 4: Server-Side JavaScript | 8% | - Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import |
| Topic 5: Browsers and Events | 17% | - Event handling, propagation, and delegation - Window and document object properties - Document Object Model (DOM) manipulation - Script loading and execution order - Browser APIs and Web Storage |
| Topic 6: Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
| Topic 7: Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Closures and execution context - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Modules and imports/exports |
JavaScript-Developer-I Exam FAQ: Try It First
Online proctored or onsite at authorized testing centers Register for the Salesforce Certified JavaScript Developer (JS-Dev-101) exam through these official channels:
After booking, VCETorrent delivers your practice questions within 1 minute — preparation starts the same day.
VCETorrent issues a full refund if you take the Salesforce Certified JavaScript Developer (JS-Dev-101) exam within 60 days of purchase and do not pass. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. Alternatively, exchange for two free exam products of equal value and keep your original update service. Orders arrive by email within 1 minute — contact support if nothing arrives within 2 hours.
The Salesforce Certified JavaScript Developer (JS-Dev-101) exam requires 65% to pass, and registration costs USD 200 (+ applicable taxes). A failed attempt means paying the same fee again — a readiness check with the VCETorrent engines before booking is the cheaper option.
The official Salesforce Certified JavaScript Developer (JS-Dev-101) outline defines 7 domains. The leading three are Objects, Functions, and Classes (25%), Variables, Types, and Collections (23%), and Testing (7%). The full list is in the topics section above, and VCETorrent's 149 practice questions cover each one.
The Salesforce Certified JavaScript Developer (JS-Dev-101) exam contains 60 scored + up to 5 unscored to complete within 105 minutes. Timed simulation in the VCETorrent Desktop Test Engine teaches that rhythm before exam day does.
No formal prerequisites; 1–2 years of JavaScript development experience recommended Since requirements change over time, confirm the latest on the official Salesforce exam page before scheduling.
Three versions of the same study materials: a printable, expert-prepared PDF with free demo download and instant access; a Desktop Test Engine for Windows that simulates the real exam with two practice modes and works offline; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. All 149 practice questions are identical across versions. Every purchase includes 365 days of free updates, a 50% renewal discount afterward, and unlimited computer installations.
The JavaScript-Developer-I exam is a Salesforce certification exam validating the Salesforce Certified JavaScript Developer (JS-Dev-101) syllabus shown above. It belongs to these credential paths: Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist. Earning it in 2026 demonstrates ability in a form employers recognize — and VCETorrent prepares candidates with 149 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.
Salesforce recommends these training resources for the Salesforce Certified JavaScript Developer (JS-Dev-101) exam:
Follow the training with steady self-testing — the 149 practice questions from VCETorrent help you apply theory and fill any gaps the training leaves.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Question #1
Which option is true about the strict mode in imported modules?
- A. A developer can only reference notStrict() functions from the imported module.
- B. Imported modules are in strict mode whether you declare them as such or not.
- C. Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
- D. Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
Correct Answer: B 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #2
Refer to the code:
01 console.log( ' Start ' );
02 Promise.resolve( ' Success ' ).then(function(value) {
03 console.log( ' Success ' );
04 });
05 console.log( ' End ' );
What is the output after the code executes successfully?
- A. Start
Success
End - B. End
Start
Success - C. Start
End
Success - D. Success
Start
End
Correct Answer: C 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #3
Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?
- A. When resolved and settled
- B. When resolved
- C. When resolved or rejected
- D. When rejected
Correct Answer: C 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #4
Given the code below:
01 const delay = async delay = > {
02 return new Promise((resolve, reject) = > {
03 console.log(1);
04 setTimeout(resolve, delay);
05 });
06 };
07
08 const callDelay = async () = > {
09 console.log(2);
10 const yup = await delay(1000);
11 console.log(3);
12 };
13
14 console.log(4);
15 callDelay();
16 console.log(5);
What is logged to the console?
- A. 4 2 1 5 3
- B. 4 2 1 5 3
- C. 1 4 2 3 5
- D. 4 5 1 2 3
Correct Answer: B 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #5
Original constructor function:
01 function Vehicle(name, price) {
02 this.name = name;
03 this.price = price;
04 }
05 Vehicle.prototype.priceInfo = function () {
06 return `Cost of the $(this.name) is $(this.price)$`;
07 }
08 var ford = new Vehicle( ' Ford Fiesta ' , ' 20,000 ' );
Which class definition is correct?
- A. class Vehicle {
constructor(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
} - B. class Vehicle {
constructor(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return ' Cost of the ${this.name} is ${this.price}$ ' ;
}
} - C. class Vehicle {
constructor() {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
} - D. class Vehicle {
vehicle(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return ' Cost of the ${this.name} is ${this.price}$ ' ;
}
}
Correct Answer: A 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
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