Not works fs.readFile in node js

Question

I have:

 fs.readFile('../services/Prescipcion.xml', "utf8", function (err, data) {
    console.log("err->", err);
    console.log("data", data);
 });

And it logs:

err-> { 
  [Error: ENOENT: no such file or directory, open '../services/Prescipcion.xml']
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '../services/Prescipcion.xml' 
}

I don't understand why this happens.

Answer 1

It worked for me

  var fs = require("fs");

    const readFIle = path => {
      fs.readFile(__dirname + path, "utf8", (err, data) => {
        if (err) {
          console.log(err.stack);
          return;
        }
        console.log(data.toString());
      });
      console.log("Program Ended");
    };

usage:

readFIle("/input.txt");

Answer 2

The error message says no such file or directory, so at first sight this most likely means the path to the file is incorrect.

Either the filename is incorrect (typo?) or the directory is incorrectly resolved. Take note that a relative path will be resolved against process.cwd():

process.cwd(): Returns the current working directory of the process.

You can try using console.log(process.cwd()) to help you debug the issue.

If the file Prescipcion.xml should be retrieved locally from where the script is run, you can also use the following construct:

fs.readFileSync(path.join(__dirname, '../services') + '/Prescipcion.xml', 'utf8');

__dirname: The name of the directory that the currently executing script resides in.

Answer 3

A full example that worked for me, based on other answer

var fs = require('fs');
var path = require('path');
var readStream = fs.createReadStream(path.join(__dirname, '../rooms') + '/rooms.txt', 'utf8');
let data = ''
readStream.on('data', function(chunk) {
    data += chunk;
}).on('end', function() {
    console.log(data);
});

Answer 4

When passing data over from a Web App to an Express server, the fs root resides under the Web App directory and NOT the server's root directory. Therefore, the first writeFile parameter must point to a directory outside the server directory, or link over to the server file tree.