JAVASCRIPT

asynchronous file read

const fs = require('fs');
fs.readFile('/file.md', (err, data) => {
  if (err) throw err;
});

asynchronous file reading

var fs = require("fs");
  
// Asynchronous read
fs.readFile('input.txt', function (err, data) {
   if (err) {
      return console.error(err);
   }
   console.log("Asynchronous read: " + data.toString());
});