What are props and state in React?

The Best Full Stack MERN Training Institute in Hyderabad with Live Internship Program

If you're looking to build a successful career in web development, Quality Thought is the top destination in Hyderabad for Full Stack MERN (MongoDB, Express.js, React, Node.js) training. Known for its industry-oriented curriculum and expert trainers, Quality Thought equips students with the skills needed to become job-ready full stack developers.

Our MERN Stack training program covers everything from front-end to back-end development. You'll start with MongoDB, a powerful NoSQL database, move on to Express.js and Node.js for back-end development, and master React for building dynamic and responsive user interfaces. The course structure is designed to offer a perfect blend of theory and hands-on practice, ensuring that students gain real-world coding experience.

What sets Quality Thought apart is our Live Internship Program, which allows students to work on real-time industry projects. This not only strengthens technical skills but also builds confidence to face real development challenges. Students get direct mentorship from industry experts, and experience the workflow of actual development environments, making them industry-ready.

We also provide complete placement assistance, resume building sessions, mock interviews, and soft skills training to help our students land high-paying jobs in top tech companies.

Join Quality Thought and transform yourself into a skilled MERN Stack Developer. Whether you're a fresher or a professional looking to upskill, this course is your gateway to exciting career opportunities in full stack development.

Enroll now and take the first step toward becoming a certified MERN stack professional with hands-on internship experience!

Props and State in React 

In React, props and state are two key concepts used to manage data and control component behavior.

🔹 Props (Short for Properties):

Props are read-only and used to pass data from parent to child components.

They allow components to be dynamic and reusable by receiving different input values.

Props are accessed via props in functional components or this.props in class components.

Example:

jsx

Copy

Edit

function Welcome(props) {

  return <h1>Hello, {props.name}!</h1>;

}

Here, name is a prop passed to the Welcome component.

🔹 State:

State is used to manage data within a component.

Unlike props, state is mutable and can change over time.

When state changes, the component re-renders automatically.

In functional components, state is managed using the useState Hook.

In class components, it is defined with this.state and updated using this.setState().

Example (Functional):

jsx

Copy

Edit

const [count, setCount] = useState(0);

Example (Class):

jsx

Copy

Edit

this.state = { count: 0 };

this.setState({ count: 1 });

🔁 Key Differences:

Feature            Props                             State

Mutability   Immutable                       Mutable

Usage            Passed to component             Defined inside component

Access                 props or this.props         useState or this.state

✅ Summary:

Props are for external data and configuration.

State is for internal, dynamic data that can change over time.

Together, they make React components interactive and data-driven.

Read more: 

JSX in Depth: JavaScript + XML Syntax

What is the difference between functional and class components?

Visit  Quality Thought Training Institute in Hyderabad