Here is a piece of math most JavaScript-Developer-I candidates learn too late: the study material costs a fraction of one retake. The Salesforce Certified JavaScript Developer (JS-Dev-101) practice questions at Actual4Exams, 149 of them, exist so that your first exam fee is your only exam fee.
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 |
| Exam Price: | USD 200 (+ applicable taxes) |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Exam Duration: | 105 minutes |
| Available Languages: | English, Japanese |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Format: | Multiple-choice, Multiple-select |
| 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 |
|---|---|---|
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules - Module system and require/import |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Object creation, properties, and methods - Closures and execution context - Modules and imports/exports - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes |
| Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
| Asynchronous Programming | 13% | - Async/await syntax - Event loop and micro/macro tasks - Fetch API and HTTP requests - Promises and chaining - Callbacks and callback hell |
| Browsers and Events | 17% | - Script loading and execution order - Window and document object properties - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation |
| Variables, Types, and Collections | 23% | - JSON parsing and usage - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Truthy and falsy values - Variable declaration and initialization |
The Salesforce JavaScript-Developer-I Exam, Question by Question
Salesforce Certified JavaScript Developer (JS-Dev-101) is an official exam run by Salesforce under exam code JavaScript-Developer-I. Passing it awards the Salesforce Certified JavaScript Developer I certification, which sits at the Intermediate / Developer tier. It also counts toward related credentials such as Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist. Certified professionals remain in shorter supply than the market wants, which is precisely why this exam keeps showing up in conversations about better roles and better pay.
The Salesforce Certified JavaScript Developer (JS-Dev-101) exam gives you 105 minutes to work through 60 scored + up to 5 unscored questions. That is a tight ratio, and it punishes candidates who get emotionally attached to any single item. The fix is mechanical: answer what you know, flag what you do not, and keep moving. A few full-length timed runs in the Actual4Exams test engine, with its randomized question order, will calibrate your pace far better than untimed reading ever could.
The official fee for Salesforce Certified JavaScript Developer (JS-Dev-101) is USD 200 (+ applicable taxes), and 65% is what passing takes. The uncomfortable part: retakes cost the full USD 200 (+ applicable taxes) again, which makes preparation the cheapest line item in this whole project. Before booking, put yourself through repeated scored sessions with the Actual4Exams practice tests and compare results over time; a stable margin above the passing line, not a single lucky run, is when you are ready.
No formal prerequisites; 1–2 years of JavaScript development experience recommended
Vendor rules do get revised, so treat this as your starting point and confirm the current eligibility details before booking via the official exam page.
Salesforce Certified JavaScript Developer (JS-Dev-101) registration runs through these official channels.
Worth noting when you schedule: the exam is delivered Online proctored or onsite at authorized testing centers.
Yes, Salesforce points Salesforce Certified JavaScript Developer (JS-Dev-101) candidates toward the following training.
Whatever course you choose, close the loop with question practice: the 149 items in the Actual4Exams JavaScript-Developer-I package convert course knowledge into exam-day scoring ability.
It is. Actual4Exams publishes a free PDF demo of the Salesforce Certified JavaScript Developer (JS-Dev-101) material, so the product can prove itself before you pay. Your purchase then comes with 365 days of free updates, and once that period ends, extending the update service costs 50% of the regular price. The test engine software itself is verified malware-free and safe to install.
Actual4Exams stands behind the product with a 100% money-back guarantee under defined conditions. If you take the Salesforce Certified JavaScript Developer (JS-Dev-101) exam within 60 days of purchase and fail, you qualify for a full refund, provided the exam corresponds to your product. Sitting the exam within 3 days of purchase does not qualify, and neither do unused downloads, free materials, or expired orders; the candidate name must match the payer name. Submit a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and claims are resolved within 7 days. You may also choose an exchange instead of a refund: two other exam products of equal value, free, with the update service on your original purchase retained.
Delivery takes about a minute. Files unlock for instant download at payment and are emailed to you automatically; if 2 hours pass with nothing received, check spam and contact customer service. There is no installation limit, so the test engine can live on every device you own, phone included.
Salesforce Certified JavaScript Developer (JS-Dev-101) breaks down into 7 official domains, led by Server-Side JavaScript (8%), Testing (7%), and Objects, Functions, and Classes (25%). You will find the full topic-by-topic outline above on this page; use the weightings to budget your study hours where they pay back the most.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?
- A. 10
- B. 5
- C. NaN
- D. undefined
Explanation: Only visible for Actual4Exams 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. Error: myFather.job is not a function
- C. John undefined
- D. John Developer
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the code:
const pi = 3.1415926;
What is the data type of pi?
- A. Number
- B. Decimal
- C. Float
- D. Double
Explanation: Only visible for Actual4Exams 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
- D. Next.js
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
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. [1, 2]
- C. [ " foo:1 " , " bar:2 " ]
- D. An error will occur due to the incorrect usage of the for_of statement on line 07.
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
No help, Full refund!
Actual4Exams confidently stands behind all its offerings by giving Unconditional "No help, Full refund" Guarantee. Since the time our operations started we have never seen people report failure in the Salesforce JavaScript-Developer-I exam after using our products. With this feedback we can assure you of the benefits that you will get from our products and the high probability of clearing the JavaScript-Developer-I exam.
We still understand the effort, time, and money you will invest in preparing for your certification exam, which makes failure in the Salesforce JavaScript-Developer-I exam really painful and disappointing. Although we cannot reduce your pain and disappointment but we can certainly share with you the financial loss.
This means that if due to any reason you are not able to pass the JavaScript-Developer-I actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.
