fs.appendFileSync in nodeJs
const fs = require('fs');
const filePath = 'example.txt';
const dataToAppend = 'This is the data to append.';
try {
fs.appendFileSync(filePath, dataToAppend, 'utf8');
console.log('Data has been appended to the file successfully.');
} catch (err) {
console.error('Error appending data to the file:', err);
}