Top jQuery Interview Questions and Answers (2025 Guide)

Beginner-Level jQuery Interview Questions

1. What's jQuery?

You can accomplish more with jQuery, a JavaScript library that lets you write lower-level code.

Making JavaScript easier to utilize web pages is its primary goal. jQuery converts jobs into styles that can be called with a single line of code, eliminating the need for many lines of JavaScript code. It also simplifies complex JavaScript actions such as DOM manipulation and AJAX request calls.

2. What are the benefits of jQuery?

Relative to other libraries and regular JavaScript, jQuery is easier to use.

It is more significant than JavaScript alone because of its extensive function library. It has a strong open-source community, which means numerous plugins are available to speed up operation development. The jQuery website offers a lot of tutorials and documentation, which is very helpful for newcomers. It also provides good support for AJAX, making it easier to develop dynamic web applications.

3. List some features of jQuery.

jQuery includes the following features:

• DOM element selection using the Sizzle chooser machine, which is part of the jQuery design.
• DOM manipulation is grounded on CSS pickers that use element names and attributes like id and class selectors.
• Event running.
• vitality and goods.
• AJAX support.
• Remitted and Promise objects for managing asynchronous processes.
• JSON parsing.
• Extensibility through plugins.
• Serviceability similar to point discovery.
• Comity styles that work in newer cybersurfers but give fallbacks for aged performances, similar to inArray() and each().
• Support for multiple cybersurfers.

Current-1 versions of Firefox, Google Chrome, Safari, and Opera are supported by jQuery 1.x and 2.x. Internet Explorer 6 and later can also use version 1.x. Internet Explorer 6–8 is no longer supported by version 2.x. Only IE 9 and later are.

4. Mention the compatible operating systems with jQuery.

All operating systems can use the JavaScript library jQuery, provided that the cybersurfer is compatible with JavaScript.

Its compatibility depends on the cybersurfer, not the operating system. It's compatible with ultramodern cybersurfers on the following platforms:

• Windows Chrome, Firefox, Edge, Safari, Opera
• macOS Safari, Chrome, Firefox, Edge, Opera
• Linux Chrome, Firefox, Opera, Chromium
• iOS Safari, Chrome, Firefox, Opera
• Android Chrome, Firefox, Opera, Samsung Internet

5. What are the various jQuery data storage options?

In jQuery, you can use the following styles to save data:

• The original storehouse  (localStorage.setItem())
• Session storehouse (sessionStorage.setItem())
• eyefuls (document.cookie)
• jQuery.

data() system

6. Is jQuery compatible with XML and HTML documents?

Yes, both HTML and XML documents can use jQuery. It offers a single API for navigating and working with XML and HTML formats.

j.Query uses selectors and methods like find(), text(), and attr() to locate elements in XML and HTML documents. jQuery, however, treats XML documents as a generic tree structure so that you can work with XML tags and attributes just as you can work with HTML elements.

7. What Are jQuery Selectors?

• You have the ability to select and manipulate HTML elements with jQuery selectors.
• jQuery selectors enable you to "locate" (or select) HTML elements on the basis of a number of attributes like name, id, classes, types, attributes, attribute values, and so on.

Not only is it rooted in the current CSS Selectors, but it also has some special selectors of its own jQuery selectors start with a dollar sign and parentheses: $.

Moving onto Intermediate Level jQuery Questions 

Intermediate-Level jQuery Questions

1. How does jQuery handle crimes?

AJAX Error Handling is one of the error-handling styles that jQuery offers. 

To handle AJAX request failures, use error, fail, or done. 

javascript

ajax({

url'example.com',

success: function(response){ console.log(response);},

error function(xhr, status, error){ console.log(status, error);}

});

-$.

error() Triggers a custom error communication.

illustration

javascript
.
error(" Custom error communication");

-Global Error Handling Use$( document).

ajaxError() to handle all AJAX errors encyclopedically.

illustration

javascript

( document).

ajaxError( function( event, xhr, settings, error){ console.log( error);});

- JavaScript crimes: Use try-catch to handle general crimes.

illustration

javascript

pass{ someUndefinedFunction();} catch( e){ console.log( e.message);}

2. Are effects provided by jQuery functions?

Some of the styles used to give goods are:

toggle(). This function checks the visibility of named rudiments and toggles between hide() and show().

Syntax$( chooser).

toggle( speed, easing, message)

slideDown() This function is used to show retired rudiments. It works with rudiments hidden using jQuery styles or those with display none in CSS.

Syntax$( chooser).

slideDown( speed, easing, message)

fadeOut() This function changes the nebulosity of an element from visible to retired, and the element doesn't occupy any space in the DOM.

Syntax$( chooser).

fadeOut( speed, easing, message)

fadeToggle() This function toggles between fadeIn() and fadeOut(). still, fadeToggle() fades them out, and if they're faded out, If rudiments are fades in.

Syntax$( chooser).

fadeToggle( speed, easing, message)

animate() This system allows for custom robustness of CSS parcels. It changes an element from one state to another with gradational transitions.

Syntax$( chooser).

animate({ styles}, speed, easing, message)

The parameters in the syntax include

- speed Optional, specifies the speed of the effect.

deliction is 400 milliseconds. Possible values are" slow"," presto", or a number in milliseconds.

- easing Optional, specifies the vitality type.

dereliction is" swing". Possible values are" swing" and" direct".

- message: Optional, a function executed after the effect completes.

3. What distinguishes jQuery from JavaScript?

Combining ECMAScript with the DOM, JavaScript is an interpreted language written in C.

In contrast, jQuery is a JavaScript library made to speed up and simplify JavaScript tasks. ECMAScript is not included in jQuery.

JavaScript generally requires long lines of code to achieve functionality, while jQuery allows you to import the library and call functions, reducing the rendering trouble.

JavaScript doesn't have a cross-browser community, forcing inventors to write code manually for different users.

jQuery, still, includes cross-browser compatibility by default.

4. What's the$() function in the jQuery library?

The $() function is used to pierce the parcels of rudiments in the DOM (Document Object Model). It's similar to JavaScript’s document.getElementById() system. The () function returns only the applicable content and nothing different.

5. What kinds of Ajax functions does jQuery offer?

To perform asynchronous calls to the server, there are several methods jQuery provides to interact with AJAX (Asynchronous JavaScript and XML). The following are the most popular AJAX functions

6. List the various kinds of jQuery methods.

Among the several kinds of jQuery methods are:

• Event methods include focus(), click(), and hover().
• Traversing functions, including siblings(), parent(), and children()
• DOM manipulation techniques, including replaceWith(), prepend(), and append()
• Techniques for manipulating CSS, including addClass(), removeClass(), and CSS()
• Animation techniques include slideUp(), fadeIn(), and animation().

7. Which line is more efficient in the following code, and why?

getElementById("interviewBit"); OR $("#interviewBit");

The native method document is utilized in the first line of code.JavaScript's native method document is utilized here since it is a native JavaScript method that does not need the additional levels of abstraction jQuery uses, whereas getElementById() is believed to be quicker than the jQuery method $().

As $() is an abbreviation for jQuery(), it is applied in the second line of code. The jQuery() function, which makes events, manages the DOM, and produces animations, is encapsulated by the $() function. The jQuery framework provides extra layers of abstraction and overhead, while the element is internally obtained using a document. Get ElementById

8. What are the benefits of using a CDN for the jQuery files?

Benefits of Using a CDN for Your jQuery Files

• Faster Page Loading Speeds

With the aid of a CDN, you can load files that are literally closer to you rather than on your original server, which cuts down on latency since the files tend to load faster.

• Caching in Browsers

It is likely already cached on the user's browser if they have previously loaded a different site that cached the same version of jQuery from the CDN. Since there is no necessity to load the file twice, it loads immediately.

• Lower Server Load & Bandwidth

The user accesses the jQuery file from the CDN, so fewer requests are being made to your server. Therefore, you're serving less load/load action and less bandwidth.

• More Reliability & Availability

A reputable CDN (e.g., Google, Microsoft, or Cloudflare) has redundant servers, so there is more uptime availability and more rapid server reliability if any are to occur.

• Improved Search Engine Optimization (SEO) & User Experience (UX)

If your page has faster loading times from the CDN anyway, it's a better UX and an increased possibility of having a positive search engine ranking.

• Easier Management for Versions

CDN XML offers several different versions option s of jQuery that you can use on your project. It's very simple - just insert the new link should you decide to switch versions.

Now onto advanced-level jQuery Interview questions

Advanced-Level jQuery interview Questions

1. What's jQuery Datepicker in jQuery?

• The jQuery UI Datepicker is a largely customizable plugin that adds date selection functionality to your web pages.
• You can acclimate the date format and language, set restrictions on the date range that can be named, and add buttons and other navigation options with ease.
• By default, the datepicker timetable appears as a small overlay when the associated textbook field receives focus.
• Just add the datepicker to a span or div element to create an inline timeline.
• It's essential to include the following jQuery reference in your HTML layout; otherwise, the datepicker won't work.
• Display month & time menus in jQuery Datepicker.

2. Differentiate between jquery.min.js and jquery.js.

Although their sizes differ, jquery.min.js and jquery.js provide the same functionality. On the other hand, it's better to use the minified version, jQuery, in case your page loads a lot of JavaScript.)

Using minified JavaScript results in better runner performance, brisk loading times, and shorter delay times for your callers.

Some crucial benefits of using jquery.min.js include

• When JavaScript lines are minified in a production environment, they load briskly, leading to better performance.
• Minifying a script reduces the train size stored in the garçon’s temporary directory and cybersurfer cache, which results in faster downloads and lower garçon responses.
• Using minified JavaScript eliminates the need to include external JavaScript lines in the HTML document.
• This makes the law structure simpler and easier to modify.

3. Can you give an illustration of chaining using a low grain?

Old Code

( document).

ready( function(){

('#id').

addClass(' ib);

('#id').

css(' color',' blue);

$('#id').

fadeIn(' slow');

);

New Code after Chaining

( document).

ready( function(){

('#id').

addClass(' ib)

css(' color',' blue')

fadeIn(' slow);

);

4. What are the pickers in jQuery? How many types of pickers are there in jQuery?

• To work with any element on a web runner, the first step is to detect it.
• Pickers are used in jQuery to identify HTML elements. Some of the most commonly used and introductory pickers are
• Name selects all rudiments with the specified name.
• Chooses one element with the given ID.
• Class Selects all rudiments with the specified class.
• Universal( *) Selects all rudiments in the DOM.

Multiple rudiments E, F, G Select the concerted result of the specified pickers E, F, or G.

The attribute selector selects rudiments based on their trait value.

5.  In jQuery, what is a prop()? What distinguishes it from Attr()? 

Feature	prop() (Property)	attr() (Attribute)
Deals with	DOM properties (state)	HTML attributes (markup)
Example (checkbox)	prop('checked') → returns true/false (current state)	attr('checked') → returns "checked" if defined in HTML
Use case	When you want the live state of an element	When you want the original HTML value

Tips to prepare for jQuery questions

1. Understanding the basics ensures you have a strong foundation in jQuery fundamentals, including pickers, events, and DOM manipulation.
2. Becoming familiar with introductory styles like ( document). ready() and$('. className') is essential.
3. Use Common Techniques: Learn how to use commonly used jQuery styles like hide(), show(), toggle(), fadeIn(), and fadeOut(). Being able to snappily write law paragraphs using these styles can be a significant advantage.
4. Expert Event Management Learn how to use on() and out() to handle events. Be prepared to describe event delegation and provide examples of its application in event management for significantly more basic elements.
5. Understand AJAX well. Feel at ease using jQuery to make AJAX requests.
6. Be able to explain how to handle success and error responses, and be familiar with the $.ajax(), $.get(), and $.post() styles.
7. Examine plugins. Recognize the idea of jQuery plugins and learn how to create them.
8. Be prepared to demonstrate how plugins can expand the capabilities of jQuery and provide a basic example of a new plugin.

FAQ’s on jQuery interview Questions

1. What is jQuery?

In jQuery Interview Questions, jQuery is explained as a lightweight JavaScript library. Most jQuery Interview Questions highlight DOM manipulation, events, AJAX, and animations. 

2. What are the advantages of jQuery?

In jQuery Interview Questions, advantages include cross-browser support, concise syntax, plugins, AJAX handling, and animations. Most jQuery Interview Questions emphasize simplicity. 

3. Compare JavaScript vs jQuery.

JavaScript and jQuery are frequently contrasted in jQuery interview questions. jQuery is a library, whereas JavaScript is a language.

4. How $(document).ready() is different from window. onload?

jQuery Interview Questions highlight $(document).ready() fires when the DOM loads, window. onload waits for resources. Recruiters ask this in jQuery Interview Questions frequently.

5. What are jQuery Selectors?

Selectors appear in many jQuery Interview Questions. They select elements by id, class, and attributes. In jQuery Interview Questions, highlight CSS-like syntax. Correct explanations in jQuery Interview Questions display practical coding clarity.

6. What do you understand by jQuery AJAX

jQuery Interview Questions often ask about AJAX handling. Mention $.ajax(), $.get(), $.post(). Recruiters test async knowledge in jQuery Interview Questions. 

7. What do you mean by Method Chaining? 

jQuery Interview Questions about chaining expect you to explain multiple methods in one statement. In the jQuery Interview Questions, mention cleaner syntax.

8. What are Animations in jQuery? 

Animations appear in jQuery Interview Questions often. Mention hide(), show(), fadeIn(), fadeOut(). In jQuery Interview Questions, focus on syntax and examples. Recruiters value clarity in jQuery Interview Questions.

Conclusion

Finally, we also learned that, despite the rapid evolution of front-end development, front-end developers can continue to learn about jQuery, especially when dealing with CMS-based solutions, legacy applications, or even lightweight applications where one can still expect to make use of jQuery. Beginning with basic choices to advanced attributes, this is a list of questions to interview about jQuery that would provide you with a well-grounded foundation on which to succeed with jQuery interviews.

When going to technical interviews, you are better off looking at the elaborate guide Sprintzeal created on interview questions about jQuery to gain confidence and competence. Check our blog to become a leader with interview materials expertly selected.