How Salesforce JS Dev 101 Questions can guide your exam prep

Quiz JS-Dev-101: Salesforce Certified JavaScript Developer

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Learn everything you need to know about the Salesforce JavaScript Developer exam, JS-Dev-101, in the United States

9 min. 11/10/2026 11/10/2026

The exam outline can change, so check the current JavaScript exam outline before you plan your study time or book an appointment.

If you are sorting through Salesforce JS Dev 101 Questions, start by learning what the exam tests and how it works. That context helps you choose useful practice and avoid studying topics that do not match the exam.

This guide explains the format, registration steps, and preparation options for JS-Dev-101. It also shows how Salesforce JS Dev 101 Questions can support your study plan without promising an exam result.

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What is JS-Dev-101: Salesforce Certified JavaScript Developer

The JS-Dev-101 exam measures your ability to use JavaScript in web development. It covers core language features as well as browser behavior, events, debugging, and testing.

The exam is separate from Salesforce platform development exams. Its focus is JavaScript, not Apex or Salesforce administration. Check whether the credential is currently open for new bookings before you begin, since exam availability can change.

A Salesforce JavaScript Developer exam study plan should start with the published exam domains. Then you can use practice questions to check how well you apply those skills, rather than relying on memorized answers.

Sample Practice Questions (JS-Dev-101: Salesforce Certified JavaScript Developer)

Try these sample questions before moving to the full interactive quiz below. Each question includes the correct answer and explanation to help you understand the concepts tested in a JS-Dev-101: Salesforce Certified JavaScript Developer exam.

1 An API returns the JSON text `[{"id":"A1","amount":"12.50"}]`. The application must produce a new JavaScript array in which `amount` is a number, while leaving the parsed source objects unchanged. Which implementation meets both requirements?

JSON and Data Transformation - Serialization, parsing, object transformation, and data interchange

A const records = JSON.parse(response); records.forEach(record => { record.amount = Number(record.amount); });

B const records = response.map(record => ({ ...record, amount: Number(record.amount) }));

C const records = JSON.parse(response).map(record => ({ ...record, amount: Number(record.amount) }));

D const records = JSON.stringify(response).map(record => ({ ...record, amount: Number(record.amount) }));

Answer: C

The response must first be parsed from JSON text into an array. `map` then creates a new array, and the object spread creates a new object for each record before converting `amount` to a number. Option A mutates the parsed objects, while options B and D attempt to use array methods on strings.

2 A list renders its items dynamically after the page loads. A click handler is attached to the list container, and the handler should process clicks on buttons inside each item, including buttons added later. Which implementation best supports this requirement?

DOM and Browser APIs - Document manipulation, events, browser storage, and Web APIs

A Attach a separate click handler to every item button immediately after each button is created

B Attach one click handler to the container and use event.target.closest('button') inside the handler

C Attach the handler to the document and prevent propagation from every unrelated element

D Attach the handler to the container and read event.currentTarget as the clicked button

Answer: B

This uses event delegation: the container receives bubbled click events, and event.target.closest('button') identifies the clicked button even when the button was added after the handler was registered. event.currentTarget refers to the container, not the originating button.

What are the main topics in JS-Dev-101: Salesforce Certified JavaScript Developer

The published exam outline groups the test into five domains. The percentages below describe the outline available for this exam. Check the latest version before you set your study priorities, as exam content can change.

Fundamentals - 27 percent. Review core JavaScript syntax, operators, control flow, and common language concepts. Make sure you can read and explain short code examples.
Variables, Types, and Collections - 23 percent. Study variable scope, data types, arrays, objects, and collection methods. Practice choosing the right structure for a small task.
Objects, Functions, and Classes - 25 percent. Focus on how functions work, how objects hold data and behavior, and how classes support object-oriented code. Pay attention to how this behaves in different contexts.
Browser and Events - 17 percent. Learn how browser APIs, the Document Object Model, and event handling work together. Practice following what happens when a user interacts with a page.
Debugging and Testing - 8 percent. Review how to find errors, use debugging tools, and test code. Be ready to reason about what a test checks and what a failure means.

These weights can help you decide where to spend more time, but they do not replace a review of every domain. For example, a small domain may still include a concept you find difficult.

A Salesforce JavaScript Developer exam candidate should also review the exam outline’s skill details, not only the domain names. Turn each skill into a task, such as tracing a function call or explaining an event handler.

First, check the credential status and exam details . Confirm that the exam is available for new appointments and that its current outline matches your study plan. A practice page or older guide does not confirm that registration remains open.

When offered, the published first-attempt fee has been USD 200, with a USD 100 retake fee, plus any applicable tax. Prices and availability can change, so confirm the current amount before you pay. Follow the registration page’s payment instructions and save your booking confirmation.

To begin exploring study materials, use the study guide collection , the Salesforce exam study path , or the downloadable exam overview . These are study resources, not proof that the exam is currently available.

Registration usually involves signing in to the exam scheduling service, selecting the exam, choosing a delivery method, and picking an open time. Review the rules for identification, rescheduling, and cancellations before you submit payment. The exact steps may change, so follow the instructions shown during booking.

The exam does not use a fixed number of passing places. You earn a pass by meeting the stated passing standard. However, appointment times and test-center seats can fill, so book early if the exam is available and you have a firm date in mind.

Where can you take JS-Dev-101: Salesforce Certified JavaScript Developer

The Salesforce JS Dev 101 Questions page can help you prepare, but it does not determine where the official exam takes place. When booking is available, the exam may offer remote proctoring or a test center appointment. Options depend on the scheduling system, your location, and open times.

For remote testing, check the room, computer, network, and identity rules before booking. For an in-person appointment, confirm the address, arrival time, and required identification. A Salesforce JavaScript Developer exam appointment is only set once the booking system confirms it.

What is the exam format for JS-Dev-101: Salesforce Certified JavaScript Developer

The published format gives candidates 105 minutes to answer 60 scored questions, with up to five unscored questions that do not count toward the result. Questions may use more than one response style, so read each instruction before you choose an answer.

The stated passing score is 65 percent. The exam reports a pass or fail result, so focus on meeting the published standard rather than guessing a raw point total. The available exam guide does not give a dependable number of correct answers that guarantees a pass on every form.

There is no separate set of tests that you must pass one by one. You need to pass the exam as a whole. If you do not pass, review the current retake rules and any waiting period before booking again.

Salesforce JS Dev 101 Questions can help you rehearse reading and applying JavaScript concepts, but a practice score is not the official exam score. Use it to spot gaps, then review the relevant skills in the official outline.

Who should take JS-Dev-101: Salesforce Certified JavaScript Developer

This exam may suit people who use JavaScript to build or maintain web applications and want to demonstrate their knowledge through a formal credential. It can also give learners a clear structure for reviewing browser-based JavaScript skills.

There is no degree or prior Salesforce certification listed as a prerequisite in the published exam information. Still, you should be comfortable reading JavaScript and working through code examples before you book. Follow the current age, identity, and test-provider rules for your appointment.

Salesforce JS Dev 101 Questions can help you decide what to review if you already know some JavaScript but feel unsure about a few domains. Use results to guide your learning, not as a measure of your value as a developer.

How difficult is JS-Dev-101: Salesforce Certified JavaScript Developer

Difficulty depends on your experience with JavaScript and browser code. Someone who writes JavaScript often may find familiar ideas easy but still need to review testing or event behavior. A newer learner may need more time to understand how the language works before attempting full practice sessions.

The exam can feel challenging when you recognize a term but cannot apply it to a code example. To address that gap, explain why each answer works and why the other choices do not. This approach builds understanding better than memorizing a question and its answer.

No reliable pass-rate figure is needed to judge your readiness. Instead, check whether you can explain the exam domains, solve fresh practice problems, and keep working within the time limit.

What are the professional benefits

A current credential can give employers or clients a structured way to see that you have studied JavaScript skills relevant to the exam. It can also help you describe your knowledge during interviews or project discussions, especially when you connect the credential to examples of work you have done.

Salesforce JS Dev 101 Questions may support a wider skills review, but practice alone does not prove professional ability. A credential also does not replace project experience, clear communication, or the ability to solve new problems.

Before planning around the credential, check whether it remains active and whether new candidates can still earn it. If it is no longer offered, the exam topics can still guide your JavaScript study, but you should not assume that you can receive the credential.

How to prepare and pass JS-Dev-101: Salesforce Certified JavaScript Developer

Start with the latest exam outline and mark each skill as familiar, uncertain, or new. Then study one domain at a time. Write small code examples, predict what they will do, and test your reasoning. A focused plan works better than reading broad notes without checking what you understand.

If you want another way to review the official learning scope, use the JavaScript certification prep module . After learning the exam structure, you can strengthen your preparation with Certification-Exam practice quizzes that simulate test conditions. The practice quiz simulator is a separate study tool, not the official exam.

The practice set contains 146 questions, and each complete session has a 120-minute limit. Its displayed average success or completion trend is 80 percent. The scoring gives 1 point for a correct answer, 0 points for a wrong answer, and 0 points for an unanswered question.

A full session can help you get used to the practice format and manage your time. After each attempt, review the questions you missed or skipped. That makes it easier to identify weak areas and spend revision time where you need it.

Repeat full sessions after you review, and compare your results across attempts. You can track whether you answer more questions confidently and finish within the time limit. Repeated, structured practice can build confidence and readiness, but it cannot guarantee a pass.

Certification-Exam also offers a Certification-Exam Simulator and Mobile App for practice. You can start from the exam learning homepage , revisit the Salesforce exam study path , and return to the simulator when you are ready for another timed session. These tools support practice and review; they do not replace the official exam guide.

Useful official resources

Before you book, check the current credential status, exam outline, price, delivery options, and candidate rules for yourself; then use those details to set a realistic study plan and confirm that the appointment fits your needs.

Frequently asked questions about JS-Dev-101: Salesforce Certified JavaScript Developer

How long should preparation take

There is no single preparation period that fits every learner. Your time depends on how often you use JavaScript and which domains need work. Try a short review first, then set study sessions around the topics you find difficult.

What should you do if the exam is not available to book

Check the current credential information before you pay for study materials or plan a test date. If booking is closed, do not assume that a third-party practice page means the exam remains active.

Can you take the exam online

Remote proctoring may be offered, but delivery choices can change and may depend on your location. Confirm the available options and technical rules during registration before selecting an appointment.

Does a practice score predict the official result

No. Practice results show how you did on a particular practice session. Use them to find topics to review, then check your progress with new questions and explanations.

What happens if you do not pass

Review the current retake rules before scheduling another attempt. Use any score details available to find weaker areas, then study those skills before trying again.

Does the credential expire

Credential status and maintenance rules can change. Check the current credential information to learn whether the certification is active and what upkeep rules apply.