Write Add Data In Json File Using Node Js

JSON is a popular format for storing and exchanging data in web development, and Node.js makes it easy to work with JSON files. In this guide, we will walk you through the steps to write and add data to a JSON file using Node.js.

Let's start by creating a basic Node.js project. Ensure you have Node.js installed on your system. Then, create a new folder for your project and open a terminal window in that directory. Run `npm init -y` to initialize a new Node.js project with default settings.

Next, install the `fs` (file system) module in Node.js. This built-in module provides functions for interacting with the file system. You can install it by running the command `npm install fs` in your project directory.

Once you have the `fs` module installed, create a new JavaScript file, for example, `writeJson.js`, in your project folder. This file will contain the code for writing and adding data to a JSON file.

In the `writeJson.js` file, require the `fs` module at the beginning of the file:

const fs = require('fs');

Next, let's create a JavaScript object with the data you want to add to the JSON file. For example, let's say you have a user object:

const userData = {
    name: 'John Doe',
    age: 30,
    email: '[email protected]'
};

Now, we will convert this object to a JSON string using `JSON.stringify()`:

const jsonData = JSON.stringify(userData, null, 2);

In the above code, `null` and `2` are optional parameters to format the JSON string with 2 spaces for better readability.

Next, we will write this JSON data to a file. You can choose any filename for your JSON file. Let's write the data to a file named `data.json`:

fs.writeFile('data.json', jsonData, (err) => {
    if (err) {
        console.error('Error writing file:', err);
        return;
    }
    console.log('Data written successfully!');
});

This code snippet uses `fs.writeFile()` to write the JSON data to the `data.json` file asynchronously. If there is an error while writing the file, it will be logged to the console. Otherwise, a success message will be displayed.

Finally, run your Node.js script using `node writeJson.js` in the terminal. If everything goes well, you should see the success message indicating that the data has been written to the JSON file.

That's it! You have successfully written and added data to a JSON file using Node.js. Feel free to customize the code to suit your requirements and explore more ways to work with JSON files in Node.js. Happy coding!