Fastest way to copy a file in Node.js

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Use the standard built-in way fs.copyFile:

const fs = require('fs');

// File destination.txt will be created or overwritten by default.
fs.copyFile('source.txt', 'destination.txt', (err) => {
  if (err) throw err;
  console.log('source.txt was copied to destination.txt');
});

If you have to support old end-of-life versions of Node.js – here is how you do it in versions that do not support fs.copyFile:

const fs = require('fs');
fs.createReadStream('test.log').pipe(fs.createWriteStream('newLog.log'));

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