PDF Version DemoA Salesforce credential carries real weight with employers, and the Salesforce Certified JavaScript Developer (JS-Dev-101) exam is the step that earns it. Getcertkey makes that step shorter with 149 expert-prepared practice questions for the JavaScript-Developer-I exam.
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 |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Format: | Multiple-select, Multiple-choice |
| Related Certifications: | Salesforce Certified Lightning Web Components Specialist Salesforce Certified Platform Developer I |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Available Languages: | Japanese, English |
| Exam Price: | USD 200 (+ applicable taxes) |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| 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 |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Modules and imports/exports - Function definitions, parameters, and scope - Decorators and advanced function patterns - Closures and execution context - Object creation, properties, and methods - Class syntax, inheritance, and prototypes |
| Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Server-Side JavaScript | 8% | - Module system and require/import - Node.js fundamentals and runtime - Core Node.js modules - Command-line tools and scripts |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Variable declaration and initialization - Array methods and data manipulation - JSON parsing and usage - Type coercion and conversion rules |
| Browsers and Events | 17% | - Script loading and execution order - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties |
| Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Promises and chaining - Callbacks and callback hell - Fetch API and HTTP requests - Async/await syntax |
| Debugging and Error Handling | 7% | - Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints - Console methods and logging |
Salesforce Certified JavaScript Developer (JS-Dev-101) Exam FAQ: What Candidates Ask Most
What is the Salesforce JavaScript-Developer-I exam?
The JavaScript-Developer-I exam is the official Salesforce exam behind the Salesforce Certified JavaScript Developer I certification, validating the skills measured by the Salesforce Certified JavaScript Developer (JS-Dev-101) credential. It sits at the Intermediate / Developer level of the Salesforce certification program. It also connects to Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist, so the knowledge you build here carries over to those tracks as well.
How many questions are on the JavaScript-Developer-I exam, and how much time do I get?
The JavaScript-Developer-I exam contains 60 scored + up to 5 unscored questions to be completed within 105 minutes. Before exam day, divide the available time by the question count to work out a comfortable per-question pace, and mark any item that eats into it so you can return later instead of getting stuck. Timed sessions in the Getcertkey test engines make that pacing automatic — run at least two full-length mock exams under the clock so time pressure never becomes the reason you drop points.
What score do I need to pass the JavaScript-Developer-I exam, and what does it cost?
The passing score for the JavaScript-Developer-I exam is 65%, and the official registration fee is USD 200 (+ applicable taxes). Retakes are not discounted — every new attempt means paying the full fee again — so it pays to measure yourself before you book. Work through the 149 practice questions on Getcertkey, sit a timed practice test, and schedule your exam only when your scores are consistently comfortable. That simple habit is the cheapest exam strategy there is.
Are there any prerequisites for the JavaScript-Developer-I exam?
No formal prerequisites; 1–2 years of JavaScript development experience recommended Requirements can change when Salesforce revises its certification program, so confirm the current eligibility rules on the official exam page before you register.
How do I register for the JavaScript-Developer-I exam?
You can book the Salesforce Certified JavaScript Developer (JS-Dev-101) exam through the official registration channels below:
As for delivery, the exam is offered in the following format: Online proctored or onsite at authorized testing centers. Choose the option that suits you best when you book your seat.
What official training is recommended for the JavaScript-Developer-I exam?
Salesforce recommends the following training resources for the Salesforce Certified JavaScript Developer (JS-Dev-101) exam:
Official courses build the foundation; the 149 practice questions from Getcertkey then show you how that knowledge is examined, so the two work best together.
Can I try the JavaScript-Developer-I practice questions before I buy?
Yes. Getcertkey provides a free JavaScript-Developer-I PDF demo so you can review the question style and answer quality before purchasing. Every purchase also includes 365 days of free updates — if Salesforce revises the exam during that period, the updated material reaches you at no cost. Once the free-update year ends, you can extend your update service at a 50% discount.
What if I fail the JavaScript-Developer-I exam, and how is my order delivered?
Every Salesforce Certified JavaScript Developer (JS-Dev-101) purchase on Getcertkey is covered by a 100% money-back guarantee with clear conditions: if you take the corresponding exam within 60 days of your purchase and do not pass, you can claim a full refund by submitting a scanned copy of your exam enrollment slip and your official score report as a PDF within two days of the exam date; claims are processed within seven days of submission. The guarantee does not apply to exams taken within three days of purchase, to material that was downloaded but never used in an exam attempt, or to free products and expired orders, and the candidate name must match the payer name. If you would rather not take a refund, you can instead exchange your purchase for two free exam preparation products of equal value and keep the update service on your original product.
Delivery is instant: your download is sent to your email within one minute of payment, with no limit on how many computers you may install the material on. If nothing arrives within two hours, check your spam folder and contact customer service for help.
What topics are covered in the JavaScript-Developer-I exam?
The Salesforce Certified JavaScript Developer (JS-Dev-101) exam blueprint is organized into 7 domains. The first three are:
- Server-Side JavaScript — 8% of the exam
- Objects, Functions, and Classes — 25% of the exam
- Asynchronous Programming — 13% of the exam
For the complete domain-by-domain breakdown, scroll up to the full exam topics outline above and use it to plan how you distribute your study time.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Question 1
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person( ' John ' , ' [email protected] ' );
07 const jane = new Person( ' Jane ' , ' [email protected] ' );
08 const emily = new Person( ' Emily ' , ' [email protected] ' );
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
A. console.group(usersList);
B. console.groupCollapsed(usersList);
C. console.info(usersList);
D. console.table(usersList);
Question 2
A developer copied a JavaScript object:
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > `${this.firstName},${this.lastName}`;
05 }
06
07 const john = new Person();
08 const dan = Object.assign({}, john);
09 dan.firstName = ' Dan ' ;
How does the developer access dan ' s firstName, lastName?
A. dan.name
B. dan.firstName + dan.lastName
C. dan.firstName() + dan.lastName()
D. dan.name()
Question 3
Refer to the code below:
01 const myFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
A. Returns NaN
B. Returns 5 # (Text here appears to be a typo; correct value is 10, see explanation.)
C. Returns 0
D. Throws an error
Question 4
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
A. setTimeout(isDeg( ' cat ' ), 60000);
B. setInterval(isDeg( ' cat ' ), 60000);
C. setTimeout(isDeg, 60000, ' cat ' );
D. setInterval(isDeg, 60000, ' cat ' );
Question 5
Which three browser specific APIs are available for developers to persist data between page loads?
A. localStorage
B. IIFEs
C. global variables
D. indexedDB
E. cookies
Solutions:
| Question 1 Answer: D | Question 2 Answer: D | Question 3 Answer: B | Question 4 Answer: D | Question 5 Answer: A,D,E |
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