JavaScript-Developer-I actual exam practice material help you to clear JavaScript-Developer-I test. If you want get professional and Salesforce real practice, recommend you to use our JavaScript-Developer-I actual test practice material latest version.
Salesforce JavaScript-Developer-I Actual Tests : Salesforce Certified JavaScript Developer (JS-Dev-101)
About Best Salesforce JavaScript-Developer-I Exam Practice Material
In 2026, employers still trust Salesforce certifications because the exams stay demanding. Actual4test helps you meet that standard with 149 JavaScript-Developer-I practice questions prepared and reviewed by certified experts.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Related Certifications: | Salesforce Certified Platform App Builder Salesforce Certified JavaScript Developer I Salesforce Certified Platform Developer I |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple Select, Multiple Choice |
| Exam Price: | USD 200 (may vary by region/tax) |
| Available Languages: | English |
| Real Exam Qty: | 60 |
| Passing Score: | 65% |
| Recommended Training: | Salesforce Trailhead JavaScript Developer I Prep Salesforce Developer Learning Paths |
| Exam Registration: | Salesforce Certification Registration (Webassessor) Salesforce Credentials Page |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| 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 |
|---|---|
| JavaScript Language Fundamentals | - ES6+ syntax and features - Data types, variables, and operators - Functions, scope, and closures |
| Salesforce Platform Integration | - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript |
| Asynchronous JavaScript | - Error handling in async workflows - Promises and async/await - Event loop and concurrency model |
| Browser and DOM Interaction | - Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) |
| Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
Everything You Want to Know About the Salesforce JavaScript-Developer-I Exam
The JavaScript-Developer-I exam (Salesforce Certified JavaScript Developer (JS-Dev-101)) is the official Salesforce exam that leads to the JavaScript Developer I certification, a credential at the Professional level. Related certifications include Salesforce Certified Platform Developer I, Salesforce Certified Platform App Builder, Salesforce Certified JavaScript Developer I. Actual4test provides 149 practice questions to help you prepare for it with confidence.
The JavaScript-Developer-I exam contains 60 questions and gives you 105 minutes to finish them. Before exam day, divide the total time by the question count so you know the pace you need to keep, and flag difficult items instead of getting stuck on them. Running at least one full timed session in the Actual4test test engine is the best way to make that time pressure feel familiar.
You need 65% to pass, and the official registration fee is USD 200 (may vary by region/tax). Keep in mind that a failed attempt means paying that fee in full again, so it pays to test yourself first. When your scores on the Actual4test timed practice tests stay consistently above the passing line, you are ready to book the exam.
No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. Requirements can change over time, so always double-check the latest eligibility rules before you register on the official Salesforce exam page.
You can book your exam through the official registration channels:
The exam is delivered in the following way: Online proctored or onsite testing via Kryterion Webassessor.
Salesforce recommends the following training options for this exam:
Official courses build the foundation, and the 149 JavaScript-Developer-I practice questions from Actual4test help you turn that knowledge into exam-day performance.
Yes. Actual4test offers a free JavaScript-Developer-I PDF demo so you can check the quality of the practice questions before purchasing. After you buy, your product comes with 365 days of free updates, and if it expires you can renew the update service at a 50% discount from your member zone.
Your purchase is protected by our 100% Money Back Guarantee. If you take the corresponding JavaScript-Developer-I exam within 60 days of purchase and do not pass, send us a scan of your enrollment slip and the official Score Report PDF within two days of the exam, and the full refund will be processed within seven days. The candidate name must match the payer name; exams taken within three days of purchase, free materials, and expired orders are not eligible. If you would rather not refund, you can exchange your product for two free products of equal value and keep the update service on your original purchase. Delivery itself is instant: your material is available for download and is emailed to you within one minute of payment. If nothing arrives within two hours, contact our support team. There is no limit on how many computers you may install it on.
The JavaScript-Developer-I syllabus is organized into 5 exam domains. Among the first three are JavaScript Language Fundamentals, Browser and DOM Interaction, Asynchronous JavaScript. For the complete breakdown of topics and subtopics, see the Exam Topics section above.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
- A. " null "
- B. " undefined "
- C. " x "
- D. " object "
Explanation: Only visible for Actual4test members. You can sign-up / login (it's free).
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client. The team wants a web server that runs on Node.js, and they want to use the new web framework Minimalist.js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
- A. Gatsby
- B. Angular
- C. Next.js
- D. Next
Explanation: Only visible for Actual4test members. You can sign-up / login (it's free).
Refer to the code below:
01 const addBy = ?
02 const addByEight = addBy(8);
03 const sum = addByEight(50);
Which two functions can replace line 01 and return 58 to sum?
- A. const addBy = function(num1) {
return function(num2) {
return num1 + num2;
}
} - B. const addBy = (num1) = > num1 + num2;
- C. const addBy = function(num1) {
return num1 * num2;
} - D. (Corrected for typing errors)
const addBy = (num1) = > {
return function(num2) {
return num1 + num2;
}
}
Explanation: Only visible for Actual4test members. You can sign-up / login (it's free).
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
- A. 5-10
- B. 10-5
- C. 5-5
- D. 10-10
Explanation: Only visible for Actual4test members. You can sign-up / login (it's free).
Given the code below:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?
- A. undefined Developer
- B. John Developer
- C. John undefined
- D. Error: myFather.job is not a function
Explanation: Only visible for Actual4test members. You can sign-up / login (it's free).
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