Are DOM manipulation and async JavaScript actually tested in frontend interviews?

Yes. DOM manipulation, event handling, Promises, async/await, and API communication are among the most tested JavaScript topics in frontend interviews in 2026. This course covers all of them through practical projects, not just definitions.

Is this course in Hindi?

Yes, completely. Every lesson and project walkthrough is in Hindi. It is part of the JavaScript Mastery Specialization built for Hindi-speaking developers who want a structured, project-driven path into modern JavaScript.

What will I get if I subscribe to this Specialization?

When you enroll in the course, you get access to all of the courses in the Specialization, and you earn a certificate when you complete the work. Your electronic Certificate will be added to your Accomplishments page - from there, you can print your Certificate or add it to your LinkedIn profile.

Is financial aid available?

Yes. In select learning programs, you can apply for financial aid or a scholarship if you can’t afford the enrollment fee. If fin aid or scholarship is available for your learning program selection, you’ll find a link to apply on the description page.

Modern JavaScript in Action: DOM, APIs & Async JS

Modern JavaScript in Action: DOM, APIs & Async JS

This course is part of Master Modern JavaScript Development Specialization

Instructors: Nikhil Agarwal

Included with

Learn more

4 modules

Gain insight into a topic and learn the fundamentals.

Beginner level

Recommended experience

8 hours to complete

Flexible schedule

Learn at your own pace

4 modules

Gain insight into a topic and learn the fundamentals.

Beginner level

Recommended experience

8 hours to complete

Flexible schedule

Learn at your own pace

What you'll learn

Build webpages that actually respond to users. Control what appears, changes, and disappears on screen without touching the HTML file
Stop avoiding asynchronous code. Understand how JavaScript handles time, waiting, and data so your apps never freeze or fail silently
Connect your code to the real internet. Retrieve and display live data from external sources and build full apps that work like production software
Write the ES6+ syntax, modules, and data structures that frontend teams actually use. Close the gap between tutorial code and real project code

Details to know

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Build your subject-matter expertise

This course is part of the Master Modern JavaScript Development Specialization

When you enroll in this course, you'll also be enrolled in this Specialization.

Learn new concepts from industry experts
Gain a foundational understanding of a subject or tool
Develop job-relevant skills with hands-on projects
Earn a shareable career certificate

There are 4 modules in this course

Most beginners learn JavaScript basics but get stuck when they try to build something real. They cannot connect code to a webpage. They have no idea how to fetch live data. This course closes that gap.

Here is what you will mainly cover: • DOM Manipulation & Events Choose elements using getElementById, querySelector, and querySelectorAll. Modify content with textContent and setAttribute. Handle click, input, & form events by using addEventListener and event delegation. • Asynchronous JavaScript Write callback functions. Chain Promises with resolve, reject, and then catch. Make use of async/await. Finally, handle parallel requests with Promise.all & errors with try/catch. • API Integration Make GET, POST, PUT, and DELETE requests implementing the Fetch API and XMLHttpRequest. Parse JSON, apply retry logic, and handle authentication headers. • ES6 Plus Features Apply ES6 Modules, destructuring, spread, rest, Symbols, Maps, Sets, optional chaining, nullish coalescing, and advanced array methods in case of real projects. Taught in Hindi and ideal for beginners and self-taught developers ready to build interactive UIs, async workflows, and API-connected applications. LearnKartS courses on Coursera have reached 200,000 plus learners worldwide. Enroll today!

Learn how to work with objects, arrays, destructuring, spread/rest operators, and modern ES6+ syntax. Strengthen your ability to manage and transform data efficiently in JavaScript.

What's included

10 videos3 assignments

10 videosTotal 47 minutes

Course Introduction1 minute
Objects - Key-Value Data Structure Basics8 minutes
Introduction to Arrays & Basic Array Operations (push, indexing) 5 minutes
Array Methods (map, filter, reduce) Explained with Examples 7 minutes
Object & Array Destructuring6 minutes
Introduction to Spread Operator & Array Expansion4 minutes
Spread Operator in Objects & Practical Use Cases 7 minutes
Rest Operators4 minutes
Practice Problems4 minutes
What is Async JavaScript2 minutes

3 assignmentsTotal 52 minutes

Proficiency Quiz20 minutes
Checkpoint Quiz16 minutes
Checkpoint Quiz16 minutes

Understand asynchronous JavaScript using callbacks, promises, and async/await. Learn how APIs work and how modern applications handle real-time data and communication.

What's included

13 videos4 assignments

13 videosTotal 69 minutes

Synchronous vs Asynchronous5 minutes
Introduction to Callbacks & Asynchronous JavaScript4 minutes
Callback Function Example & Error Handling Flow 6 minutes
Introduction to Promises & Basics of Async Handling 3 minutes
Promise Syntax, resolve/reject & then-catch Flow7 minutes
Promise Methods (finally, Promise.all) & Real-world Usage5 minutes
Introduction to Async/Await & Benefits over Promises 4 minutes
Using async & await Syntax with Examples4 minutes
Handling Multiple Promises & Error Handling (try-catch)6 minutes
Promise.all with Async/Await & Advanced Usage 8 minutes
What is API? Basics & Real-World Examples3 minutes
Types of APIs & REST API Concepts4 minutes
Browser APIs, Custom APIs & Key Benefits8 minutes

4 assignmentsTotal 52 minutes

Proficiency Quiz12 minutes
Checkpoint Quiz12 minutes
Checkpoint Quiz16 minutes
Checkpoint Quiz12 minutes

Learn how to manipulate the DOM, handle events, work with forms, and communicate with APIs using Fetch and AJAX. Build dynamic and interactive frontend experiences using modern JavaScript.

What's included

15 videos4 assignments

15 videosTotal 94 minutes

Introduction to Fetch API, JSON Basics & Client-Server Communication6 minutes
Making GET Requests using fetch() & Understanding Response Object6 minutes
Handling JSON Data, Response Parsing & Error Handling Basics6 minutes
HTTP Methods (POST, PUT, DELETE) & Sending Data with Headers & Body6 minutes
Creating POST Requests & Authentication (Headers, Tokens, JSON.stringify)6 minutes
Advanced Fetch: Retry Logic, Timeout Handling & Status Code Management8 minutes
AJAX with XMLHttpRequest & axios for APIs6 minutes
Introduction to DOM & getElementById() Method6 minutes
getElementsByClassName() & getElementsByTagName() Explained6 minutes
querySelector() vs querySelectorAll() & CSS Selector-Based Selection7 minutes
Modifying Content & Attributes (textContent, setAttribute, getAttribute)6 minutes
Styling Elements & Managing Classes (style, classList add/remove/toggle)6 minutes
Adding & Removing Elements (createElement, appendChild, remove, insertBefore)7 minutes
Event Handling Basics & Common Events (click, mouse, keyboard)6 minutes
Form Events, preventDefault() & Handling User Input with Event Listeners6 minutes

4 assignmentsTotal 64 minutes

Proficiency Quiz16 minutes
Checkpoint Quiz16 minutes
Checkpoint Quiz16 minutes
Checkpoint Quiz16 minutes

Explore advanced ES6+ features including modules, Maps, Sets, event delegation, validation, and modern array methods. Learn scalable and modular JavaScript techniques used in real-world applications.

What's included

13 videos4 assignments

13 videosTotal 72 minutes

Event Delegation4 minutes
Form Handling Basics & Submit Event with Validation5 minutes
Accessing Input Values & Preventing Default Form Submission5 minutes
Real-time Validation (Email Check) & Practice Problem (Dynamic UI Change)8 minutes
Basic ES6+ features6 minutes
ES6 Modules and Modular JavaScript Programming5 minutes
Using Symbols as Object Keys6 minutes
Maps: Key-Value Storage, Methods (set, get, has, delete) & Iteration5 minutes
end Sets: Unique Values, Operations (add, has, delete) & Union/Intersection8 minutes
Basic ES Features (Exponentiation, includes(), Object.values & entries)6 minutes
Advanced Operators (BigInt, Nullish Coalescing ??, Numeric Separator)6 minutes
Array Methods (flat, at, toSorted, toReversed, toSpliced) Explained7 minutes
Summary1 minute

4 assignmentsTotal 51 minutes

Proficiency Quiz15 minutes
Checkpoint Quiz12 minutes
Checkpoint Quiz12 minutes
Checkpoint Quiz12 minutes

Earn a career certificate

Add this credential to your LinkedIn profile, resume, or CV. Share it on social media and in your performance review.

Instructors

Nikhil Agarwal

LearnKartS

17 Courses1,477 learners

Offered by

LearnKartS

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Frequently asked questions

Basic JavaScript is enough. Variables, functions, loops, and arrays are all you need. No prior experience with the DOM, async programming, or APIs is required. If you completed the foundational course in this specialization, you are fully ready to continue.

Most async explanations start with theory. This course starts with why async exists, what breaks without it, and builds through callbacks, Promises, and async/await in a sequence that makes sense. Every step is applied to real code before moving on.

You build working projects throughout, including a dynamic profile card, an expense tracker, a student data manager, and a task management dashboard. Every concept connects directly to something that runs in a browser, not isolated drills that go nowhere.

This course builds skills directly relevant to frontend developers, junior JavaScript developers, web developers, and UI developer roles. DOM manipulation, async programming, Fetch API, and ES6+ syntax are the exact skills listed in entry-level frontend job descriptions across India and globally. Combined with HTML and CSS, this course positions you for your first real frontend role or freelance project.

To access the course materials, assignments and to earn a Certificate, you will need to purchase the Certificate experience when you enroll in a course. You can try a Free Trial instead, or apply for Financial Aid. The course may offer 'Full Course, No Certificate' instead. This option lets you see all course materials, submit required assessments, and get a final grade. This also means that you will not be able to purchase a Certificate experience.