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ReactJS TestRenderer.toJSON() Method

  • Last Updated : 03 Jun, 2021

React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us some in-built methods that we can override at particular stages in the life-cycle of the component.

In this article, we will know how to use TestRenderer.toJSON() method. This method is used to return an object representing the rendered tree in JSON form.

Creating React Application And Installing Module:

  • 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
  • Step 3: Install the required module using the following command.

    npm install react-test-renderer

Project Structure: It will look like the following.

Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js




import React from 'react';
import TestRenderer from 'react-test-renderer';
  
// Defining our App Component
const App = () => {
  
  // Function to demonstrate TestRenderer.toJSON() method
  function testRenderFun() {
    const renderer = TestRenderer.create(
      <div>GeeksforGeeks
      TestRenderer.toJSON() method
      </div>
    );
    console.log(renderer.toJSON());
  }
  
  // Function Call
  testRenderFun();
  
  // Returning our JSX code
  return <>
    <p>
      GeeksforGeeks TestRenderer.toJSON() method
    </p>
  
  </>;
}
  
// Exporting your Default App Component
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:

Reference: https://reactjs.org/docs/test-renderer.html#testrenderertojson

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