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 Premium Dumps
Check Updated on: Sep 12, 2026
No. of Questions: 149 Questions & Answers with Exam Engine
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Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Certificate Validity Period: | None (Credential does not expire) |
| Available Languages: | English |
| Exam Format: | Multiple-select, Multiple-choice |
| Passing Score: | 65% |
| Exam Price: | $200 USD |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Exam Duration: | 105 minutes |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center) |
| Pre Condition: | None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Browser and Events | 17% | - Event propagation (bubbling and capturing) - Browser-specific APIs - DOM manipulation - Browser Developer Tools usage - Event handling and listeners - Interacting with forms and user input |
| Asynchronous Programming | 13% | - Callbacks - Event loop and execution flow - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Async/Await syntax |
| Debugging and Error Handling | 7% | - Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection |
| Objects, Functions, and Classes | 25% | - Higher-order functions - Prototypal inheritance - Execution flow and context - ES6 classes and inheritance - Modules and decorators - Object creation and manipulation - Arrow functions - Variable scope and closures - Function declarations and expressions |
| Testing | 7% | - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts - Test effectiveness evaluation |
| Variables, Types, and Collections | 23% | - Arrays and collections - JSON parsing and manipulation - Strings, numbers, and dates - Primitive and complex data types - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion |
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals - Core Node.js modules - CLI commands |
Salesforce JavaScript-Developer-I Exam: Frequently Asked Questions
The JavaScript-Developer-I exam is the official exam behind the Salesforce Developer credential from Salesforce. It sits at the Junior / Associate level of the Salesforce certification track. It is also associated with Salesforce Certified JavaScript Developer I Credential. The FreeCram practice questions on this page map to the same objectives, so you can measure your readiness before you book a seat.
The JavaScript-Developer-I exam contains 60 (plus up to 5 unscored pilot questions) questions and gives you 105 minutes to complete them. That pace leaves little room for getting stuck, so train yourself to flag a hard question, move on, and circle back later. Run at least one full timed session in the FreeCram test engine a week before your exam date to check whether your pacing holds under pressure.
You need 65% to pass the JavaScript-Developer-I exam, and the official registration fee is $200 USD. A retake means paying that fee again in full, which makes thorough preparation the cheaper option by far. Before scheduling, take a timed FreeCram practice test; if you are not scoring comfortably above the passing line, give yourself more study time instead of booking on hope.
None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam.
Requirements can change, so confirm the latest details on the official Salesforce exam page before you register.
Yes. A free JavaScript-Developer-I PDF demo is available, so you can check the question style and answer quality before you commit. Every purchase also includes 365 days of free updates, and if your product expires after that, you can extend 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 JavaScript-Developer-I exam within 60 days of purchase and do not pass, send us a scanned enrollment slip and your official Score Report PDF within two days of the exam; approved refunds are processed within seven days. The candidate name must match the payer name, and the guarantee does not apply to exams taken within three days of purchase, to products that were downloaded but never used in an exam sitting, or to free materials and expired orders. If you would rather keep studying, we can instead exchange your order for two free exam products of equal value while your original product keeps its update service. Delivery itself is instant: your download is emailed within one minute of payment and stays available in your member zone, with no limit on how many computers you can install it on. If nothing arrives within two hours, contact our customer service team.
The JavaScript-Developer-I syllabus is divided into 7 domains, including Asynchronous Programming (13%), Debugging and Error Handling (7%), and Variables, Types, and Collections (23%). The complete breakdown, with every domain and its subtopics, is listed in the Exam Topics section above — review it line by line and flag the areas where you feel weakest.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Considering type coercion, what does the following expression evaluate to?
true + ' 13 ' + NaN
- A. ' 113NaN '
- B. ' true13NaN '
- C. 14
- D. ' true13 '
Explanation: Only visible for FreeCram members. You can sign-up / login (it's free).
Which two implementations of utils.js support foo and bar?
- A. import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar }; - B. export default class {
foo() { return ' foo ' ; }
bar() { return ' bar ' ; }
} - C. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export default { foo, bar }; - D. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar };
Explanation: Only visible for FreeCram members. You can sign-up / login (it's free).
A developer wants to advocate for a mature, well-supported web framework/library instead of a new one (Minimalist.js).
Which two should be recommended?
- A. Express
- B. Vue
- C. React
- D. Koa
Explanation: Only visible for FreeCram members. You can sign-up / login (it's free).
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. String(var1).concat(var2)
- B. var1.toString() + var2.toString()
- C. String.concat(var1 + var2)
- D. var1 + var2
Explanation: Only visible for FreeCram members. You can sign-up / login (it's free).
A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js.
Without using any third-party libraries, what should the developer add to index.js to create the secure web server?
- A. const https = require( ' https ' );
- B. const http = require( ' http ' );
- C. const server = require( ' secure-server ' );
- D. const tls = require( ' tls ' );
Explanation: Only visible for FreeCram members. You can sign-up / login (it's free).
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