readfilesync

1const fs = require('fs')
2
3try {
4  const data = fs.readFileSync('/Users/joe/test.txt', 'utf8')
5  console.log(data)
6} catch (err) {
7  console.error(err)
8}

1const fs = require('fs');
2
3fs.readFile('/Users/joe/test.txt', 'utf8' , (err, data) => {
4  if (err) {
5    console.error(err);
6    return
7  }
8  console.log(data);
9});

1// macOS, Linux, and Windows
2fs.readFileSync('<directory>');
3// => [Error: EISDIR: illegal operation on a directory, read <directory>]
4
5//  FreeBSD
6fs.readFileSync('<directory>'); // => <data>

1fs.readFile('filename', function read(err, data) {
2    if (err) {
3        throw err;
4    }
5    var content = data;
6  
7    console.log(content);  
8   
9});

1fs.readFile('/etc/passwd', 'utf8', callback);
2