Full Stack Developer Interview Questions for Freshers (With Answers)

Introduction:

A full-stack interview for freshers typically does not involve writing complex code. Instead, businesses mostly examine the basics. They want to determine if you have a basic understanding of how a website operates and can properly communicate what you know.

This blog is intended to help you review the most important

full-stack developer interview questions and answers in a beginner-friendly manner.

It is a useful resource if you are enrolled in a full stack developer course in Coimbatore and want an overview of basics.

1) What is Full Stack Development?

Full stack development involves developing a comprehensive website or application by working on all major aspects of the project.

A full stack developer usually works on:

• Frontend refers to the part of the screen that users see and interact with.
• The backend is the part that handles logic, requests, and responses.
• The database is where all data is permanently kept.

A simple definition you can remember:

Full Stack = Frontend + Backend + Database

This is one of the initial and most significant Full Stack Developer Interview Questions for Freshers.

2) What is the difference between Frontend and Backend?

Frontend and backend are two different parts of a website.

Frontend (Client-side)

Frontend is the part visible to users. It includes:

• The website layout and structure.
• Buttons, forms, and menus.
• Pages like Home, About, Contact, Login, Register.
• Mobile responsiveness and design.

Frontend technologies:

• HTML, CSS, JavaScript
• React, Angular, Vue

Backend (Server-side)

Backend is the part that runs behind the screen. It includes:

• Checking login details.
• Saving registration data.
• Handling cart, wishlist, payments.
• Sending data from database to frontend.

Backend technologies:

• Node.js, Express.js
• PHP, Python, Java, .NET

A simple way to remember:

Frontend = what you see

Backend = how it works

3) What are the main skills required to become a Full Stack Developer?

Interviewers ask this question to ensure that you grasp the entire learning route. These are the most important full-stack developer abilities for beginners.

Frontend skills:

• To develop page structures, you should be familiar with HTML.
• To layout and make pages responsive, you should be familiar with CSS.
• JavaScript is the core language for web programming, thus you should be familiar with it.
• To create modern user interfaces, you should first master the basic principles of React.

Backend skills:

• To run JavaScript on the server, you need to understand Node.js.
• You should learn Express.js to build backend APIs.
• To connect the frontend and backend, you must first learn the basics of the REST API.

Database skills

• You should learn MongoDB for MERN stack projects.
• You should know MySQL basics because SQL is still used in many companies.
• You should understand CRUD operations because every app needs create, read, update, and delete.

Extra important skills

• You should know Git and GitHub because companies expect version control knowledge.
• You should understand basic deployment so you can make your projects live.
• You should build at least 2 projects to show practical knowledge.

If you are doing a full stack developer course in Coimbatore, these skills are usually covered in the same order. Codei5 academy also focuses on practical learning so freshers gain confidence.

If you want a complete beginner-friendly guide, read our detailed blog on “Skills Required to Become a Full Stack Developer from Scratch”.

4) What is HTML and why is it important?

HTML stands for Hypertext Markup Language. It is used to define the structure of a webpage.

HTML is important because it helps create:

• Headings, paragraphs, and content sections.
• Links for navigation.
• Images, videos, and icons.
• Forms like login and contact forms.

Without HTML, you cannot build a webpage.

5) What is CSS and how is it used in web development?

CSS stands for Cascading Style Sheets. CSS is used to layout and design websites.

CSS helps in:

• Adding colors, fonts, and background styling.
• Managing spacing, alignment, and layout.
• Creating responsive design for mobile users.
• Making the website look clean and professional.

6) What is the difference between class and id in CSS?

This is a relatively common question for newcomers.

id

• Used for one unique element.
• Should not be repeated on the same page.

class

• Used for multiple elements.
• Can be repeated many times.

Example:

• id: mainHeader
• class: buttonStyle

Simple rule:

id = one

class = many

7) What is JavaScript and why is it used?

JavaScript is a computer language designed to make websites more interactive.

JavaScript is used for:

• Form validation before submitting.
• Showing and hiding content dynamically.
• Handling events like button clicks.
• Calling APIs and displaying data.
• Building logic for web applications.

JavaScript is very important because MERN stack uses JavaScript for both frontend and backend.

8) What is the difference between == and === in JavaScript?

This question checks your basics.

• == compares values only and does datatype conversion.
• === compares values and datatype without conversion.

Example:

• “10” == 10 → true
• “10” === 10 → false

9) What is DOM in JavaScript?

DOM stands for Document Object Model.

The DOM represents the structure of a webpage. JavaScript interacts with HTML through the DOM.

Using DOM, JavaScript can:

• Change text content.
• Change CSS styles.
• Add or remove elements.
• Handle user interactions.

Example:

When a popup opens after clicking a button, DOM is involved.

10) What is responsive design?

Responsive design means the website works properly on all devices:

• Mobile
• Tablet
• Laptop
• Desktop

Responsive design is important because:

• The majority of users view webpages on their mobile devices.
• Google ranks mobile-friendly websites higher.
• A responsive website improves the user experience.

11) What is Bootstrap and why is it used?

Bootstrap is a CSS framework for creating responsive websites quickly.

Bootstrap is handy because of:

• It includes ready-made components such as buttons, forms, navigation bars, and cards.
• It has a grid system for responsive layouts.
• It saves time and cuts down on manual CSS authoring.
• It is suitable for beginners.

Bootstrap is often used in new projects.

12) What is React and why is it popular?

React is a JavaScript package used to create front-end user interfaces.

React is popular because:

• It uses reusable components.
• It provides faster UI updates.
• It is widely used by companies.
• It supports large-scale application development.

Most students taking a full stack developer course in Coimbatore focus on React because it is an important component of the MERN stack. Codei5 academy also teaches students how to use React projects.

13) What is the difference between props and state in React?

Props and state are important in React.

Props

• Data passed from parent to child.
• Read-only and cannot be changed by the child.

State

• Data managed inside the component.
• Can change based on user actions.

Example:

• Props: product name passed to a component.
• State: cart count changing on click.

14) What is Node.js?

Node.js is a runtime environment that enables JavaScript to execute on the server.

Node.js is used for backend development because:

• It handles API requests and responses.
• It connects backend logic with database.
• It supports scalable applications.
• It allows JavaScript to be used everywhere.

15) What is Express.js?

Express is used because:

• It makes backend development simple.
• It helps create APIs easily.
• It supports routing and middleware.
• It is widely used in MERN stack projects.

Express.js is a framework built using Node.js.

16) What is an API?

API stands for Application Programming Interface.

API serves as a link between the frontend and the backend.

Example:

Frontend requests:

“Give me the product list”

Backend responds:

“Here is the product list from the database”

APIs are important for modern applications.

17) What is a REST API?

REST API is a type of API that follows standard rules and uses HTTP methods.

Main methods:

• GET: fetch data
• POST: create data
• PUT: update data
• DELETE: delete data

The REST API is one of the most significant topics covered in Full Stack Developer Interview Questions for Freshers.

18) What is MongoDB?

MongoDB is a NoSQL database.

MongoDB saves data as documents in JSON format.

MongoDB is popular because:

• It is flexible for modern apps.
• It integrates easily with Node.js.
• It is widely used in MERN stack project.

19) What is Git and why do developers use it?

Git is a version-control system.

• It tracks code changes.
• It helps developers collaborate in teams.
• It allows developers to return to old versions.
• It helps manage multiple features using branches.

Git is a must-have skill for beginners.

20) What is deployment? How do you deploy a website?

Deployment implies making your project available on the internet.

Deployment includes:

• Hosting frontend on Netlify or Vercel.
• Hosting backend on Render or Railway.
• Connecting database and environment variables.
• Testing the live project.

Deployment knowledge is useful since it demonstrates practical understanding.

Conclusion:

Full stack development becomes simple when you learn it step by step. Full stack development becomes straightforward if you understand it step by step.

If you prefer structured learning, a full stack developer course in Coimbatore might help you learn more quickly. Many students prefer Codei5 Academy because it offers actual assignments and interview preparation.

Finally, keep practicing these full stack developer interview questions and answers while focusing on strengthening your fundamentals. With practice, you will undoubtedly pass your first interview.

If you’re from a non-IT background, don’t worry, read our blog “How a Full-Stack Developer Course Helps Non-IT Students Enter the IT Industry?” to understand how you can start step-by-step.

FAQs:

1) Can I learn full stack if I’m a complete beginner?

Yes. If you learn step-by-step, full stack is beginner-friendly.

2) How long does it take to learn full stack development?

Usually3 to 6 months with regular practice.

3) Do I need coding knowledge before joining a full stack course?

No. Most courses start from basics like HTML and JavaScript.

4) Is MERN stack good for getting a job as a fresher?

Yes. MERN stack is one of the most in-demand full stack skills.

5) What is the best way to prepare for full stack interviews?

Practice basics daily and build at least 2 projects.