Is React a Framework or a Library?

One of the most common React interview questions is:

"Is React a framework or a library?"

The correct answer is:

React is a library.

More specifically, React is a JavaScript library for building user interfaces.

Although many developers casually refer to React as a framework, there is an important distinction.

What Is a Library?

A library provides specific functionality that developers can use when needed.

With a library:

You control the application structure.
You choose supporting tools.
You decide how different parts fit together.

React primarily focuses on the user interface layer.

What Is a Framework?

A framework provides a more complete structure for building applications.

Frameworks often include:

Routing
State Management
Project Structure
Development Conventions

The framework typically dictates how your application should be organized.

Why React Is Considered a Library

React focuses mainly on:

Components
Rendering
UI Updates

For additional functionality, developers often choose separate tools.

For example:

Routing libraries
State management libraries
Form libraries

This flexibility is one of React's biggest strengths.

Why People Call React a Framework

In practice, React applications often use multiple tools together.

For example:

React
React Router
State Management
Build Tools

As a result, the complete ecosystem can feel like a framework.

However, React itself remains a library.

What About Next.js?

This is where many developers become confused.

Next.js is generally considered a framework.

It builds on top of React and provides:

Routing
Server Rendering
Project Structure
Performance Features

So:

React = Library
Next.js = Framework

Why This Matters in Interviews

Interviewers sometimes ask this question because they want to see if candidates understand React's role in the frontend ecosystem.

A strong answer should explain not only that React is a library, but also why.

Why Namaste React Covers Concepts Like This

Many developers memorize that React is a library without understanding the reasoning.

Namaste React focuses on conceptual clarity by explaining:

How React works
Why React was designed this way
The philosophy behind the React ecosystem

This deeper understanding helps learners answer interview questions with confidence.

The Bottom Line

React is a JavaScript library, not a framework.

It focuses on building user interfaces while giving developers the flexibility to choose other tools for routing, state management, and application architecture.

Understanding this distinction helps you better understand the React ecosystem and perform well in interviews.

Is React a Framework or a Library?