What is Proptypes in React ?

PropTypes is a way of specifying the types of props that a React component expects to receive. PropTypes are a type checking feature that was originally introduced in React, but have since been moved to a separate prop-types package that can be used with React or other libraries. With PropTypes, you can define the expected types of your component's props and provide runtime validation to help catch errors and ensure that your component is used correctly. Here's an example of how to use PropTypes with a React functional component:

  
 
 import React from 'react';
import PropTypes from 'prop-types';

function Greeting(props) {
  return 
Hello, {props.name}!
;
}

Greeting.propTypes = {
  name: PropTypes.string.isRequired,
};

export default Greeting;


  

In this example, we define a functional component named Greeting that takes a single prop named name. We use the propTypes property to define the expected type of the name prop as a string, and we mark it as required using the isRequired method. This means that if the name prop is not provided, or is not a string, a warning will be printed in the console at runtime. This can help catch errors early and make it easier to debug your code. PropTypes are a powerful tool for ensuring that your React components are used correctly, but they are not strictly necessary. As an alternative, you can use TypeScript or other static type checkers to achieve similar type checking functionality.