Upload to node server file

README.md

Copy and paste from W3School

• https://www.w3schools.com/nodejs/nodejs_uploadfiles.asp

But I had a problem with WSL with following error:

Unhandled rejection Error: EXDEV: cross-device link not permitted

So I worked with maximum effort to google and paste from the following SO answer

• https://stackoverflow.com/a/44146825/3290525

public-index.html

<!-- public/index.html -->
<form action="fileupload" method="post" enctype="multipart/form-data">
<input type="file" name="filetoupload"><br>
<input type="submit">
</form>

server-uploadfile-express.js

const express = require("express");
const app = express();
const formidable = require('formidable');
const fs = require('fs');
const path = require("path")

app.use(express.static("public"));

app.post("/fileupload", (req, res) => {
    var form = new formidable.IncomingForm();
    form.parse(req, function (err, fields, files) {
        var oldpath = files.filetoupload.path;
        var newpath = path.join(__dirname, files.filetoupload.name)

        // Read the file
        fs.readFile(oldpath, function (err, data) {
            if (err) throw err;
            console.log('File read!');

            // Write the file
            fs.writeFile(newpath, data, function (err) {
              if (err) throw err;
              res.write('File uploaded and moved!');
              res.end();
              console.log('File written!');
            });

            // Delete the file
            fs.unlink(oldpath, function (err) {
              if (err) throw err;
              console.log('File deleted!');
            });
        });
    });
});

app.listen(8080, ()=> {
	console.log("WORKING 8080");
});

server-uploadfile-http.js

var http = require('http');
var formidable = require('formidable');
var fs = require('fs');
const path = require("path")

http.createServer(function (req, res) {
  if (req.url == '/fileupload') {
    var form = new formidable.IncomingForm();
    form.parse(req, function (err, fields, files) {
      var oldpath = files.filetoupload.path;
      var newpath = path.join(__dirname, files.filetoupload.name)

      // Read the file
      fs.readFile(oldpath, function (err, data) {
        if (err) throw err;
        console.log('File read!');

        // Write the file
        fs.writeFile(newpath, data, function (err) {
          if (err) throw err;
          res.write('File uploaded and moved!');
          res.end();
          console.log('File written!');
        });

        // Delete the file
        fs.unlink(oldpath, function (err) {
          if (err) throw err;
          console.log('File deleted!');
        });
      });
 });
  } else {
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.write('<form action="fileupload" method="post" enctype="multipart/form-data">');
    res.write('<input type="file" name="filetoupload"><br>');
    res.write('<input type="submit">');
    res.write('</form>');
    return res.end();
  }
}).listen(8080);