Salesforce JS-Dev-101 Exam : Salesforce Certified JavaScript Developer - Multiple Choice

Salesforce JS-Dev-101 exam
  • Exam Code: JS-Dev-101
  • Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
  • Updated: Oct 12, 2026
  • Q & A: 149 Questions and Answers
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About Salesforce JS-Dev-101 Exam Questions

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Salesforce JS-Dev-101 Exam Syllabus Topics:

SectionWeightObjectives
Browser and Events17%- Event handling, propagation, listeners
- Browser APIs and developer tools
- DOM selection and manipulation
Objects, Functions, and Classes25%- ES6 classes, inheritance, modules, decorators
- Object creation, properties, prototypes
- Function types, scope, closures, arrow functions
Server Side JavaScript8%- Package management and CLI tools
- Node.js fundamentals and core modules
Testing7%- Unit test structure and effectiveness
- Test coverage and improvement
Variables, Types, and Collections23%- Strings, numbers, dates, arrays and methods
- JSON parsing and manipulation
- Data types, type coercion, truthy/falsy values
- Variable declaration and scope
Debugging and Error Handling7%- Console usage, breakpoints and debugging techniques
- Error types and handling strategies
Asynchronous Programming13%- Event loop and execution flow
- Callbacks, promises, async/await

JS-Dev-101 Exam FAQ: Straight Answers from VerifiedDumps

The JS-Dev-101 exam is Salesforce's official assessment for the Salesforce Certified JavaScript Developer certification, positioned at the Intermediate / Specialist level. It measures whether you can apply the Salesforce Certified JavaScript Developer - Multiple Choice skills in practical, job-like situations — which is why rote memorization alone rarely gets candidates across the line. The credential fits into a wider Salesforce certification path that includes Salesforce Certified Developer, Salesforce Certified Platform Developer I, so passing it opens more than one door. Think of the JS-Dev-101 exam as the point where your preparation becomes a qualification employers can verify.

The Salesforce Certified JavaScript Developer - Multiple Choice syllabus is organized into 7 domains, beginning with Debugging and Error Handling (7%), Testing (7%), and Browser and Events (17%). Those percentages are your study budget: a domain carrying a larger share of the score deserves a matching share of your hours. The full domain-by-domain breakdown is in the exam topics section above — work from that, not from habit.

You'll have 105 minutes to complete 60 scored + up to 5 unscored questions on the Salesforce Certified JavaScript Developer - Multiple Choice exam. Before test day, convert those numbers into a per-question time budget — then defend it. When a single question starts eating double its share, mark it, move on, and return with whatever time remains. Two or three full timed runs in the VerifiedDumps test engine will make that discipline automatic; its built-in timer records every attempt so you can watch your pace improve session by session.

Salesforce sets the passing bar at 65%, and a seat at the JS-Dev-101 exam costs USD 200. There is no reduced fee for a second try — a miss means paying the full amount again — so the cheapest retake is the one you never need. A sensible approach: run timed self-assessments with VerifiedDumps practice tests until your scores sit comfortably above the passing mark with margin to spare, then book your exam date. That cushion absorbs nerves and the inevitable oddball question.

Salesforce lists the Salesforce Certified JavaScript Developer - Multiple Choice question formats as: Multiple choice, Multiple select. Each format has its own trap. With scenario items, the actual question hides at the end of a long stem — read the last sentence first, then work back through the details. With elimination-friendly formats, cross out what you can disprove before committing. The VerifiedDumps question bank lets you rehearse every format until the mechanics feel boring, which is exactly where you want to be on exam day.

You can sit the Salesforce Certified JavaScript Developer - Multiple Choice exam in English, Japanese. Go with whichever language you process fastest under pressure — comprehension speed quietly decides close exams. If English is your choice, working through VerifiedDumps's 149 English-language practice questions doubles as terminology drills, so the exam's phrasing reads like a familiar accent instead of a foreign one.

Once you pass the Salesforce Certified JavaScript Developer - Multiple Choice exam, your credential stays valid for Does not expire; requires maintenance updates. Don't let that date ambush you — mark it on a calendar now, and look into the recertification path well before expiry so renewal is a planned errand rather than an emergency. Recertification rules belong to Salesforce and do change, so verify the current policy on the official certification page.

All three versions contain the same 149 expert-written practice questions — you're choosing a study style, not a syllabus:

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Short on time? The test engines' automatic performance reports show you which topics still bleed points, so your remaining hours land where they matter.

Of course. VerifiedDumps publishes a free PDF demo for the Salesforce Certified JavaScript Developer - Multiple Choice exam, and the software version offers a free trial experience, so you can evaluate the question quality hands-on before spending a cent. When you do buy, 365 days of free updates come with the purchase — and after that year, extending your update service costs only 50% of the regular price, right from your member zone.

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Everything about this purchase is built to remove friction: a free demo before you commit, delivery to your inbox within one minute of payment (contact support if 2 hours pass with nothing), and installation on as many computers as you own. McAfee security services guard every transaction, your personal information is never shared with third parties, and 365 days of free updates keep your JS-Dev-101 material aligned with the live exam.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions:

Question #1

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, .. → ....)

  • A. [].concat.apply(inArray, []);
  • B. [].concat::...inArray();
  • C. [].concat.apply({}, inArray);
  • D. [].concat(...inArray);
Reveal Solution  Discussion  0

Correct Answer: C,D  🗳️

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Question #2

Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?

  • A. Add .catch to the Promise chain
  • B. try/catch around requestPromise().then(...)
  • C. Use finally handler for errors
  • D. (duplicate of A)
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

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Question #3

A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

  • A. window.addEventListener('onload', personalizeWebsiteContent);
  • B. document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);
  • C. window.addEventListener('load', personalizeWebsiteContent);
  • D. document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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Question #4

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 style, event listeners and other attributes applied to the carSpeed DOM element
  • B. The values of the carSpeed and fourWheels variables
  • C. A variable displaying the number of instances created for the Car object
  • D. The information stored in the window.localStorage property
Reveal Solution  Discussion  0

Correct Answer: A,D  🗳️

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Question #5

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, 0);
  • B. sum(10, 0);
  • C. sum(5)(5);
  • D. sum(5, 2, 3);
  • E. sum()(10);
Reveal Solution  Discussion  0

Correct Answer: A,B,D  🗳️

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