1. Reading file

const fs = require('fs');

fs.readFile("/tmp/test.txt", "utf8", (err, data) => {
  console.log(data);
});

• fs.readFile( - reads file and returns data in callback function,
• /tmp/test.txt - path to text file to read,
• utf8 - encoding to read text in,
• console.log(data) - log date from file to console.

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2. Writing file

const fs = require('fs');
fs.writeFile('/tmp/test.txt', 'hi!', (err, data) => {
  console.log(err);
});

• require('fs') - library to work with file system,
• /tmp/test.txt - path of file to write,
• 'hi!' - Data to write to file,
• console.log(err) - if err is not null, something wrong happened,
• fs.writeFile( - writes given data to specified file.

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