nodejs fs writefile base64url

First, import the 'fs' module in your Node.js application by using the 'require' keyword:

const fs = require('fs');

Then, use the 'writeFile' method provided by the 'fs' module to write data to a file. This method takes three parameters: the file path, the data to be written, and an optional callback function. In this case, we will use a base64url data string as the data to be written. Here is an example:

const filePath = 'path/to/file.txt';
const data = 'SGVsbG8gd29ybGQh'; // Base64url data
fs.writeFile(filePath, data, (error) => {
  if (error) {
    console.error('Error:', error);
  } else {
    console.log('File written successfully!');
  }
});

In the above example, we specify the file path as 'path/to/file.txt' and the base64url data as 'SGVsbG8gd29ybGQh'. The callback function is used to handle any errors that may occur during the writing process. If an error occurs, it will be logged to the console. If the writing process is successful, the message 'File written successfully!' will be logged to the console.

That's it! The 'writeFile' method will write the base64url data to the specified file path in your Node.js application.