nodejs open file for writing code example

Example 1: writefile in node js

// write_stream.js

const fs = require('fs');

let writeStream = fs.createWriteStream('secret.txt');

// write some data with a base64 encoding
writeStream.write('aef35ghhjdk74hja83ksnfjk888sfsf', 'base64');

// the finish event is emitted when all data has been flushed from the stream
writeStream.on('finish', () => {
    console.log('wrote all data to file');
});

// close the stream
writeStream.end();

Example 2: data not write in file node js

const fs = require('fs');

fs.readFile('file.txt', 'utf-8', (err, data) => {
    if(err) {
        throw err;
    }
    console.log(data);
});