PDF Version DemoA Salesforce certification remains one of the clearest career accelerators in IT. The Salesforce Certified JavaScript Developer (JS-Dev-101) exam stands in the way, and the 149 practice questions at ActualPDF are the direct route through it.
Salesforce JavaScript-Developer-I Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Related Certifications: | Salesforce Certified JavaScript Developer I Credential |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | None (Credential does not expire) |
| Exam Format: | Multiple-select, Multiple-choice |
| Available Languages: | English |
| Exam Price: | $200 USD |
| 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 |
|---|---|---|
| Testing | 7% | - Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts |
| Debugging and Error Handling | 7% | - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging |
| Server Side JavaScript | 8% | - CLI commands - Server-side JavaScript implementations - Package management (npm) - Core Node.js modules - Node.js fundamentals |
| Asynchronous Programming | 13% | - Callbacks - Asynchronous patterns for business requirements - Event loop and execution flow - Promises (creation, chaining, error handling) - Async/Await syntax |
| Variables, Types, and Collections | 23% | - Type coercion and conversion - JSON parsing and manipulation - Variable declarations and initialization - Primitive and complex data types - Truthy and falsy evaluations - Strings, numbers, and dates - Arrays and collections |
| Objects, Functions, and Classes | 25% | - Arrow functions - Higher-order functions - Prototypal inheritance - Object creation and manipulation - Function declarations and expressions - Execution flow and context - ES6 classes and inheritance - Modules and decorators - Variable scope and closures |
| Browser and Events | 17% | - DOM manipulation - Browser Developer Tools usage - Event handling and listeners - Event propagation (bubbling and capturing) - Browser-specific APIs - Interacting with forms and user input |
Salesforce JavaScript-Developer-I Exam: FAQ for Serious Candidates
Salesforce Certified JavaScript Developer (JS-Dev-101) is an official Salesforce exam, listed under exam code JavaScript-Developer-I. A passing result earns you the Salesforce Developer certification at the Junior / Associate level. It also ties into Salesforce Certified JavaScript Developer I Credential, extending its value across your certification roadmap. Employers read this credential as verified competence, which is why it keeps appearing in job requirements.
Expect 60 (plus up to 5 unscored pilot questions) questions inside 105 minutes on the Salesforce Certified JavaScript Developer (JS-Dev-101) exam. That pace punishes hesitation, so rehearse it: the ActualPDF software engine simulates the real exam scene, reminds you of the questions you got wrong, and pushes you to re-practice them until the clock stops being your enemy.
Passing Salesforce Certified JavaScript Developer (JS-Dev-101) requires 65%, and the official registration fee is $200 USD. Retakes charge the full $200 USD again, which is why experienced candidates treat preparation as the cheaper exam fee. Verify your readiness with repeated ActualPDF practice scores above the requirement before you commit to a date.
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 evolve, so confirm the current conditions before registering on the official exam page.
Yes. ActualPDF provides a free download demo of the Salesforce Certified JavaScript Developer (JS-Dev-101) material, so you can check the content before choosing a version. After purchase, a one-year warranty covers you: the latest version is sent to you as it releases, free for 365 days, and after expiry you can extend the update service at a 50% discount.
Your purchase is covered by a 100% money-back guarantee with clear conditions. Take the Salesforce Certified JavaScript Developer (JS-Dev-101) exam within 60 days of purchase; if you fail, provide your unqualified result by submitting a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and the full refund is processed within 7 days. The exam must match your product, candidate and payer names must match, and attempts within 3 days of purchase, unused downloads, free materials, and expired orders are not covered. Alternatively, exchange for two other exam products of equal value, free, or wait for updates while keeping your original product's update service.
Delivery is instant: files unlock for download at payment and are emailed within one minute. If nothing arrives within 2 hours, check spam and contact customer service, which works 7/24 and normally replies within two hours. Installation is unlimited across your computers.
The Salesforce Certified JavaScript Developer (JS-Dev-101) syllabus spans 7 domains, led by Asynchronous Programming (13%), Testing (7%), and Server Side JavaScript (8%). The complete topic list is published above; candidates who study the map first rarely get lost later.
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Which statement allows a developer to update the browser navigation history without a page refresh?
- A. window.customHistory.pushState(newStateObject, ' ' , null);
- B. window.history.updateState(newStateObject, ' ' );
- C. window.history.createState(newStateObject, ' ' );
- D. window.history.pushState(newStateObject, ' ' , null);
Correct Answer: D 🗳️
Explanation: Only visible for ActualPDF 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 getNextValue();
06 } catch(error) {
07 handleError(error);
08 } - C. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 } - D. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
08 getNextValue();
Correct Answer: B 🗳️
Explanation: Only visible for ActualPDF members. You can sign-up / login (it's free).
Refer to the code below:
01 let total = 10;
02 const interval = setInterval(() = > {
03 total++;
04 clearInterval(interval);
05 total++;
06 }, 0);
07 total++;
08 console.log(total);
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
- A. 10
- B. 12
- C. 13
- D. 11
Correct Answer: D 🗳️
Explanation: Only visible for ActualPDF members. You can sign-up / login (it's free).
A team at Universal Containers works on a big project and uses Yarn to deal with the project's dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?
- A. The developer missed the option --save when adding the dependency.
- B. The developer missed the option --add when adding the dependency.
- C. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
- D. The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
Correct Answer: C 🗳️
Explanation: Only visible for ActualPDF members. You can sign-up / login (it's free).
Refer to the code:
01 console.log( ' Start ' );
02 Promise.resolve( ' Success ' ).then(function(value) {
03 console.log( ' Success ' );
04 });
05 console.log( ' End ' );
What is the output after the code executes successfully?
- A. Success
Start
End - B. Start
End
Success - C. End
Start
Success - D. Start
Success
End
Correct Answer: B 🗳️
Explanation: Only visible for ActualPDF members. You can sign-up / login (it's free).
