ReactJS defaultProps

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The defaultProps is a React component property that allows you to set default values for the props argument. If the prop property is passed, it will be changed. The defaultProps can be defined as a property on the component class itself, to set the default props for the class.

Creating React Application:

Step 1: Create a React application using the following command:

npx create-react-app foldername

Step 2: After creating your project folder i.e. foldername, move to it using the following command:

cd foldername

Project Structure: It will look like the following.

Creating defaultProps in class-based component: Now write down the following code in the App.js file. Here, App is our default component where we have written our code using a class-based component.

App.js

import React, { Component } from 'react'; 
  
class App extends Component { 
  render() { 
    return ( 
      <div > 
        <Person name="kapil" eyeColor="blue" age="23"></Person> 
        <Person name="Sachin" eyeColor="blue" ></Person> 
        <Person name="Nikhil" age="23"></Person> 
        <Person eyeColor="green" age="23"></Person> 
      </div> 
    ); 
  } 
} 
  
class Person extends Component { 
  render() { 
    return ( 
      <div> 
        <p> Name: {this.props.name} </p> 
        <p>EyeColor: {this.props.eyeColor}</p> 
        <p>Age : {this.props.age} </p> 
      </div> 
    ) 
  } 
} 
  
Person.defaultProps = { 
  name: "Rahul", 
  eyeColor: "deepblue", 
  age: "45"
} 
  
export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

Creating defaultProps in Functional Component: Now write down the following code in the App.js file. Here, App is our default component where we have written our code using a functional component.

App.js

import React from 'react'; 
  
function App(props) { 
  return ( 
    <div > 
      <Person name="kapil" eyeColor="blue" age="23"></Person> 
      <Person name="Sachin" eyeColor="blue" ></Person> 
      <Person name="Nikhil" age="23"></Person> 
      <Person eyeColor="green" age="23"></Person> 
    </div> 
  ); 
} 
  
function Person(props) { 
  return ( 
    <div> 
      <p> Name: {props.name} </p> 
      <p>EyeColor: {props.eyeColor}</p> 
      <p>Age : {props.age} </p> 
      <hr></hr> 
    </div> 
  ) 
} 
  
Person.defaultProps = { 
  name: "Rahul", 
  eyeColor: "deepblue", 
  age: "45"
} 
  
export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

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