Files

Working with paths, files and directories

Paths

The __dirname value is the full path for the current file.

__dirname

Compare with the working directory.

process.cwd()

https://alligator.io/nodejs/how-to-use__dirname/

Read a text file

Encoding is optional.

var fs = require('fs');

fs.readFile('file.txt', 'utf-8', (err, data) => {
    console.log(data);
});

See path lib. https://nodejs.org/api/path.html

path.join(__dirname, '/foo');

const fs = require('fs');
const path = require('path');

const p = path.join(__dirname, '/foo');

fs.readFile(p, 'utf-8', (err, data) => {
    console.log(data);
});

Make directory

fs.mkdirSync(p);

Make file

Create file if it doesn’t exist.

fs.openSync(p, 'a');

Write content to a file.

var data = "New File Contents";

fs.writeFile("temp.txt", data, (err) => {
  if (err) {
    console.log(err);
  }
  else {
    console.log("Done.");
  }
});

Or. Note SomeStream is not defined here.

const { createWriteStream } = require('fs');

const myStream = new SomeStream();

const writeStream = createWriteStream('file.txt');
myStream.pipe(writeStream);

myStream.write('line');
myStream.end();