What is the method for displaying nicely formatted JSON data within a text area using React.js?

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One way to display nicely formatted JSON data within a text area using React.js is by using the JSON.stringify() method to format the data and then setting the value of the text area to the formatted data using state.

Here's an example code snippet:

import React, { useState } from 'react';

function JsonTextArea() {
  const [jsonData, setJsonData] = useState('');

  const handleChange = (event) => {
    try {
      const data = JSON.parse(event.target.value);
      setJsonData(JSON.stringify(data, null, 2));
    } catch (error) {
      setJsonData(event.target.value);
    }
  };

  return (
    <textarea value={jsonData} onChange={handleChange} />
  );
}

export default JsonTextArea;

In this code, we create a state variable called jsonData to hold the formatted JSON data. We also create a handleChange() function which is called whenever the user types in the text area.

Within the handleChange() function, we first attempt to parse the user's input into JSON format using JSON.parse(). If this is successful, we then use JSON.stringify() to format the data with null as the second argument (which signifies that we don't want to filter anything out) and 2 as the third argument (which specifies the number of spaces for indentation).

If parsing fails for any reason (such as if the user types invalid JSON), we simply set the state variable to the user's input.

Finally, we render a text area with the value set to the jsonData state variable and the onChange event set to our handleChange() function.

With this code, the user can type in any JSON data and it will automatically format into a readable structure for easier viewing.