Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Certification Provider: Salesforce
Corresponding Certification: Salesforce Developer
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Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Exam Duration: | 105 minutes |
| Real Exam Qty: | 60 |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified JavaScript Developer I Salesforce Certified Platform App Builder |
| Passing Score: | 65% |
| Exam Price: | USD 200 (may vary by region/tax) |
| Exam Format: | Multiple Choice, Multiple Select |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Available Languages: | English |
| Recommended Training: | Salesforce Developer Learning Paths Salesforce Trailhead JavaScript Developer I Prep |
| Exam Registration: | Salesforce Credentials Page Salesforce Certification Registration (Webassessor) |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Online proctored or onsite testing via Kryterion Webassessor |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper1 |
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
| Topic 2: Salesforce Platform Integration | - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript |
| Topic 3: Asynchronous JavaScript | - Promises and async/await - Event loop and concurrency model - Error handling in async workflows |
| Topic 4: JavaScript Language Fundamentals | - Functions, scope, and closures - ES6+ syntax and features - Data types, variables, and operators |
| Topic 5: Browser and DOM Interaction | - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) - Event handling and propagation |
Common Questions About the Salesforce Certified JavaScript Developer (JS-Dev-101) Exam
The Salesforce Certified JavaScript Developer (JS-Dev-101) (exam code JavaScript-Developer-I) is the exam you pass to earn the JavaScript Developer I certification, a credential at the Professional level. It is also connected with related credentials such as Salesforce Certified Platform Developer I, Salesforce Certified Platform App Builder, Salesforce Certified JavaScript Developer I. If you are mapping out a certification path with Salesforce, this exam is a milestone worth planning around.
The JavaScript-Developer-I exam includes 60 questions, and you have 105 minutes to complete them. With that many questions on the clock, pacing is part of the challenge: divide your time into rough blocks as you go, and flag the items that stall you so you can circle back at the end instead of burning minutes on a single question. A week or two before your exam date, sit at least one full timed session in the 2Pass4sure test engine under the same time limit, so the pace feels familiar rather than frantic on the day.
You need 65% to pass the JavaScript-Developer-I exam, and the official registration fee is USD 200 (may vary by region/tax). That fee is due again in full for every retake, which makes thorough preparation the cheaper investment by far. Before you book your seat, test yourself with the 2Pass4sure practice questions until you are scoring comfortably above the passing mark on a consistent basis — it is the simplest way to avoid paying for the same exam twice.
No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended.
Eligibility rules can be adjusted by Salesforce over time, so before you register, confirm the current requirements on the official exam page: view the official JavaScript-Developer-I exam information.
You can book the JavaScript-Developer-I exam through the official registration channels below:
How the exam is taken: Online proctored or onsite testing via Kryterion Webassessor.
Salesforce lists the following official training options for candidates preparing for this exam:
Once you have worked through the training, measure your readiness with the 149 practice questions from 2Pass4sure — they show you exactly which topics still need attention before you book the exam.
Yes. 2Pass4sure offers a free PDF demo of the JavaScript-Developer-I practice questions, so you can judge the quality of the material firsthand before paying anything. Every purchase also includes 365 days of free updates — if Salesforce changes the exam during that year, your material changes with it. And when the free update period expires, you can extend it at a 50% discount from within your member zone.
Every JavaScript-Developer-I purchase at 2Pass4sure is backed by a 100% Money Back Guarantee: if you take the corresponding exam within 60 days of your purchase and do not pass, you can apply for a full refund. The guarantee has clear conditions — it does not apply if you sit the exam within 3 days of purchase, if you downloaded the material but never actually took the exam, or to free materials and expired orders, and the candidate name must match the payer name. To file a claim, send a scan of your exam enrollment slip together with your official Score Report PDF within 2 days of the exam; claims are processed within 7 days. If you would rather not take a refund, you can exchange the product instead and receive two additional exam preparation products of equal value for free, while your original product keeps its update service. Delivery itself is instant: your material is available for download right after payment and is also sent to your email within one minute — if it has not arrived within 2 hours, contact our customer service. There is no limit on how many computers you can install it on.
The official Salesforce Certified JavaScript Developer (JS-Dev-101) outline divides the exam content into 5 main domains. The first three are:
- JavaScript Language Fundamentals
- Asynchronous JavaScript
- Browser and DOM Interaction
That is only the headline view — scroll back up to the Exam Topics section on this page for the complete domain-by-domain breakdown before you plan your study schedule.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Question 1
Refer to the code declarations below:
let str1 = ' Java ' ;
let str2 = ' Script ' ;
Which three expressions return the string JavaScript?
A. str1.concat(str2);
B. str1 + str2;
C. `${str1}${str2}`
D. str1.join(str2);
E. const({str1, str2});
Question 2
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
< input type= " text " value= " Hello " name= " input " >
< button type= " button " > Display < /button >
JavaScript:
01 const button = document.querySelector( ' button ' );
02 button.addEventListener( ' click ' , () = > {
03 const input = document.querySelector( ' input ' );
04 console.log(input.getAttribute( ' value ' ));
05 });
When the user clicks the button, the output is always " Hello " .
What needs to be done to make this code work as expected?
A. Replace line 02 with button.addCallback( " click " , function() {
B. Replace line 03 with const input = document.getElementByIdName( ' input ' );
C. Replace line 02 with button.addEventListener( " onclick " , function() {
D. Replace line 04 with console.log(input.value);
Question 3
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String( ' St. Louis ' );
04 let city2 = String( ' New York ' );
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?
A. ' new york '
B. undefined
C. An error
D. ' New York '
Question 4
Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?
A. [ " foo " , " bar " ]
B. An error will occur due to the incorrect usage of the for_of statement on line 07.
C. [ " foo:1 " , " bar:2 " ]
D. [1, 2]
Question 5
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
A. Add a listener to the window object to handle the load event
B. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
C. Add a handler to the personalizeWebsiteContent script to handle the load event
D. Add a listener to the window object to handle the DOMContentLoaded event
Solutions:
| Question 1 Answer: A,B,C | Question 2 Answer: D | Question 3 Answer: A | Question 4 Answer: B | Question 5 Answer: A |
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