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Ambitious IT professionals treat certifications as leverage, and the Salesforce Certified JavaScript Developer (JS-Dev-101) is one of the strongest levers around. BraindumpsIT gives you JavaScript-Developer-I practice questions to pull it with.
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 |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Available Languages: | English, Japanese |
| Passing Score: | 65% |
| Exam Price: | USD 200 (+ applicable taxes) |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple-choice, Multiple-select |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| 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 |
|---|---|---|
| Topic 1: Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Closures and execution context - Function definitions, parameters, and scope - Modules and imports/exports - Object creation, properties, and methods - Class syntax, inheritance, and prototypes |
| Topic 2: Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Unit testing concepts - Testing frameworks and assertions |
| Topic 3: Browsers and Events | 17% | - Script loading and execution order - Browser APIs and Web Storage - Event handling, propagation, and delegation - Window and document object properties - Document Object Model (DOM) manipulation |
| Topic 4: Server-Side JavaScript | 8% | - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules |
| Topic 5: Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Array methods and data manipulation - Variable declaration and initialization - JSON parsing and usage |
| Topic 6: Asynchronous Programming | 13% | - Async/await syntax - Promises and chaining - Callbacks and callback hell - Event loop and micro/macro tasks - Fetch API and HTTP requests |
| Topic 7: Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Console methods and logging - Error types and exception handling |
Salesforce Certified JavaScript Developer (JS-Dev-101) FAQ: Clear Answers for Serious Candidates
The JavaScript-Developer-I exam is Salesforce's official route to the Salesforce Certified JavaScript Developer I certification (Intermediate / Developer level). For IT professionals building a career, it signals verified skill — the kind of advantage that tips better opportunities your way. It also sits in a family of related credentials: Salesforce Certified Platform Developer I, Salesforce Certified Lightning Web Components Specialist.
Delivery is instant — files unlock at payment and a copy lands in your email within a minute; our 24/7 online service team responds within 2 hours if anything goes missing, and there are no installation limits. On refunds, our guarantee is real but conditional: take the corresponding JavaScript-Developer-I exam within 60 days of purchase, and if you fail, send a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam — we process the full refund within 7 days. Exams taken within 3 days of purchase, name mismatches between candidate and payer, and free or expired products are excluded. Rather have a replacement? Exchange for two equal-value exam products free and keep your original updates.
Yes — the vendor points candidates to these courses:
Training teaches; practice reveals. Once a course ends, the JavaScript-Developer-I practice questions from BraindumpsIT tell you how much of it will survive real exam conditions.
No formal prerequisites; 1–2 years of JavaScript development experience recommended Requirements like these do get updated, so confirm the details on the official exam page — official JavaScript-Developer-I exam information — before you spend anything on registration.
Registration runs USD 200 (+ applicable taxes), and the pass mark is 65%. Paying by credit card is the standard route — safe and stable for both buyer and seller. And remember the fee is per attempt: a retake costs the same again, which is why candidates drill with the 149 practice questions from BraindumpsIT until their margin is comfortable.
The exam sets 60 scored + up to 5 unscored questions against 105 minutes on the clock. That pairing punishes hesitation, so train it out: set a per-question budget, flag-and-return instead of freezing, and rehearse full timed sessions in the BraindumpsIT engine until pacing is automatic.
Yes — a free PDF demo lets you examine the question quality first. If you buy, 365 days of free updates are included, with new versions sent to you as they're released; an expired update period can be renewed later at 50% off.
Registration runs through the vendor's official channels:
The exam is available Online proctored or onsite at authorized testing centers — choose whatever fits your schedule and setup when you book.
Expect 7 domains in the Salesforce Certified JavaScript Developer (JS-Dev-101) blueprint, headlined by Testing (7%), Server-Side JavaScript (8%), Browsers and Events (17%). Use the weights as your study budget — high-percentage domains earn the most points per hour. The complete outline above has the full breakdown.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Given two expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is data type string?
- A. var1 + var2
- B. String.concat(var1 + var2)
- C. var1.toString() + var2.toString()
- D. String(var1).concat(var2)
Correct Answer: C,D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
A developer wrote the following code:
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs. How can the developer change the code to ensure this behavior?
- A. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } finally {
08 getNextValue();
09 } - B. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
08 getNextValue(); - C. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 } - D. 03 try {
04 handleObjectValue(x);
05 getNextValue();
06 } catch(error) {
07 handleError(error);
08 }
Correct Answer: D 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?
- A. When resolved or rejected
- B. When rejected
- C. When resolved
- D. When resolved and settled
Correct Answer: A 🗳️
Explanation: Only visible for BraindumpsIT 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. Double
- B. Number
- C. Float
- D. Decimal
Correct Answer: B 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
A developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
- A. Ensures stability with one major release every few years.
- B. Performs a static analysis on code before execution to look for runtime errors.
- C. Installs with its own package manager to install and manage third-party libraries.
- D. Uses non-blocking functionality for performant request handling.
- E. Executes server-side JavaScript code to avoid learning a new language.
Correct Answer: C,D,E 🗳️
Explanation: Only visible for BraindumpsIT members. You can sign-up / login (it's free).
