- Exam Code: JS-Dev-101
- Exam Name: Salesforce Certified JavaScript Developer - Multiple Choice
- Updated: Oct 11, 2026
- Q & A: 149 Questions and Answers
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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Server Side JavaScript | 8% | - Salesforce API integration - Node.js applications - Modules and file operations |
| Topic 2: Testing | 7% | - Automated testing strategies - Test-driven development principles - Unit testing with Jest |
| Topic 3: Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - DOM manipulation - Browser Developer Tools |
| Topic 4: Objects, Functions, and Classes | 25% | - Object creation, properties, and prototypal inheritance - Function declarations, expressions, and arrow functions - JavaScript modules (export, import) - Higher-order functions and closures - ES6 Classes, constructors, methods, and inheritance |
| Topic 5: Variables, Types, and Collections | 23% | - JSON parsing and stringification - Array manipulation (map, filter, reduce, forEach, find) - String manipulation and Date objects - Type coercion and type conversion - Variable declaration (var, let, const, scoping, hoisting) |
| Topic 6: Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Topic 7: Asynchronous Programming | 13% | - Callback patterns - Promises and async/await - Event loop and asynchronous code execution |
The JS-Dev-101 exam is how Salesforce decides who earns the Salesforce Developers certification, which sits at the Elementary level. It measures practical command of the Salesforce Certified JavaScript Developer - Multiple Choice objectives — the skills you'd actually use on the job — which is why it carries weight with employers in a competitive market. It's also part of a wider certification family that includes Salesforce Certified JavaScript Developer I, Lightning Web Components Specialist Superbadge, so the effort you invest here keeps paying off as you advance. Candidates do best when they treat the exam as a skills check, not a memory test.
Salesforce organizes the Salesforce Certified JavaScript Developer - Multiple Choice syllabus into 7 domains, opening with Browser and Events (17%), Testing (7%), and Asynchronous Programming (13%). Those weightings are a gift: they tell you where the points concentrate, so you can front-load the domains that decide your score. The full breakdown lives in the exam topics section above — build your study plan around it.
Expect 60 (plus up to 5 unscored pilot questions) questions within 105 minutes on the Salesforce Certified JavaScript Developer - Multiple Choice exam. Treat that ratio as a pacing contract: work out your per-question budget now, and during the exam, flag anything that threatens to overrun it and circle back later. Candidates who rehearse this under a real timer — the Actual4Dumps test engine runs one on every mock exam — consistently finish with time to review instead of guessing through the final questions.
You'll need 65% to pass the Salesforce Certified JavaScript Developer - Multiple Choice exam, and a seat costs $200 USD. Since retakes bill the full fee again, the economics are simple: arrive over-prepared. The reliable method is timed self-testing — run Actual4Dumps practice exams until your scores sit clearly above the passing mark across several sessions, then register. You're not buying certainty; you're refusing to pay for the same exam twice.
Salesforce lists the Salesforce Certified JavaScript Developer - Multiple Choice question types as: Multiple Choice, Multiple Select. Knowing the list is half the battle; the other half is practicing against each type until its mechanics are boring. For lengthy scenario items, anchor on the actual question sentence before digesting the stem. Actual4Dumps's 149 practice questions cover these formats, so nothing on your screen in the exam room is a first encounter.
The Salesforce Certified JavaScript Developer - Multiple Choice exam is currently available in English. Pick the language where your reading speed is highest — in a timed exam, comprehension pace quietly decides borderline scores. If you're testing in English, Actual4Dumps's English-language JS-Dev-101 practice questions double as drills for the exact terminology Salesforce favors.
Passing the Salesforce Certified JavaScript Developer - Multiple Choice exam earns you a credential that stays valid for Lifetime (No renewal required). Put the expiry date somewhere you'll see it — renewal is painless when planned and painful when discovered late. Because Salesforce owns the recertification policy and revises it from time to time, check the official certification page well before your renewal window opens.
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Our research team has tracked the Salesforce Certified JavaScript Developer - Multiple Choice exam for years, and the question bank is revised continuously as Salesforce shifts what's tested — not on an annual schedule. Purchases include 365 days of free updates via your member zone, and you can watch for releases through the New Releases section or the Actual4Dumps newsletter. Re-check 3-4 days before your exam date, and if a product ever expires, repurchasing at 50% off restarts the update flow.
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Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
01 console.time('Performance');
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three functions?
Correct Answer: D 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
JavaScript:
01 function Tiger() {
02 this.type = 'Cat';
03 this.size = 'large';
04 }
05
06 let tony = new Tiger();
07 tony.roar = () => {
08 console.log('They\'re great!');
09 };
10
11 function Lion() {
12 this.type = 'Cat';
13 this.size = 'large';
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?
Correct Answer: B,D 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
Which three browser specific APIs are available for developers to persist data between page loads?
Correct Answer: A,B,D 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
HTML:
<p> The current status of an Order: <span id="status"> In Progress </span> </p> Which JavaScript statement changes 'In Progress' to 'Completed'?
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Dumps members. You can sign-up / login (it's free).
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