write json to file in javascript

To write a JSON object to a file in JavaScript, you can use the fs (file system) module (Node.js built-in module). Here is a sample code block that writes a JSON object to a file:

index.tsx
const fs = require('fs');

let data = { 
  name: "John", 
  age: 31, 
  city: "New York" 
};

let jsonData = JSON.stringify(data);

fs.writeFile('data.json', jsonData, (err) => {
    if (err) throw err;
    console.log('JSON data is saved to file.');
});
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In the above code, we are first requiring the fs module. We then define a JavaScript object (data).

Next, we use the JSON.stringify() method to convert our data object to a JSON string (jsonData).

We use the fs.writeFile() method to write the jsonData to a file named data.json. The first argument of the writeFile() method specifies the file name and location you want to write to. The second argument is the data you want to write to the file. The third argument is a callback function that will be executed when the writeFile() operation is complete.

If there is any error, it will throw an error, and if successful, it will log a message that the JSON data is saved to the file.