const
  express = require('express'),
  app = express(),
  formidable = require('formidable'),
  path = require('node:path'),
  fs = require('node:fs'),
  throttle = require('express-throttle-bandwidth')

const
  port = process.env.PORT || 4444,
  folder = path.join(__dirname, 'files')

if (!fs.existsSync(folder)) {
  fs.mkdirSync(folder)
}

app.set('port', port)
app.use(throttle(1024 * 128)) // throttling bandwidth

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*')
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
  next()
})

app.post('/upload', (req, res) => {
  const form = new formidable.IncomingForm()

  form.uploadDir = folder
  form.parse(req, (_, fields, files) => {
    console.log('\n-----------')
    console.log('Fields', fields)
    console.log('Received:', Object.keys(files))
    console.log()
    res.send('Thank you')
  })
})

app.listen(port, () => {
  console.log('\nUpload server running on http://localhost:' + port)
})

<q-uploader
  url="http://localhost:4444/fileuploader/upload"
  label="Upload"
  style="max-width: 300px"
/>

<template>
  <q-uploader
    label="Upload"
    :factory="factoryFn"
    style="max-width: 300px"
  />
</template>

<script>
export default {
  methods: {
    factoryFn (file) {
      return new Promise((resolve, reject) => {
        // Retrieve JWT token from your store.
        const token = "myToken";
        resolve({
          url: 'http://localhost:4444/fileuploader/upload',
          method: 'POST',
          headers: [
            { name: 'Authorization', value: `Bearer ${token}` }
          ]
        })
      })
    }
  }
}
</script>

[Route("api/[controller]")]
[ApiController]
public class FileUploaderController : ControllerBase
{
    [HttpPost]
    public async Task upload()
    {
        // Request's .Form.Files property will
        // contain QUploader's files.
        var files = this.Request.Form.Files;
        foreach (var file in files)
        {
            if (file == null || file.Length == 0)
                continue;

            // Do something with the file.
            var fileName = file.FileName;
            var fileSize = file.Length;
            // save to server...
            // ...
        }
    }
}

// java
@RestController
public class UploadRest {
	@PostMapping("/upload")
	public void handleFileUpload(@RequestPart(value = "file") final MultipartFile uploadfile) throws IOException {
		saveUploadedFiles(uploadfile);
	}

	private String saveUploadedFiles(final MultipartFile file) throws IOException {
		final byte[] bytes = file.getBytes();
		final Path path = Paths.get("YOUR_ABSOLUTE_PATH" + file.getOriginalFilename());
		Files.write(path, bytes);
	}
}

// html
<q-uploader field-name="file" url="YOUR_URL_BACK/upload" with-credentials />

// python
from flask import Flask, request
from werkzeug import secure_filename
from flask_cors import CORS
import os

app = Flask(__name__)

# This is necessary because QUploader uses an AJAX request
# to send the file
cors = CORS()
cors.init_app(app, resource={r"/api/*": {"origins": "*"}})

@app.route('/upload', methods=['POST'])
def upload():
    for fname in request.files:
        f = request.files.get(fname)
        print(f)
        f.save('./uploads/%s' % secure_filename(fname))

    return 'Okay!'

if __name__ == '__main__':
    if not os.path.exists('./uploads'):
        os.mkdir('./uploads')
    app.run(debug=True)

# Julia Genie

using Genie, Genie.Requests, Genie.Renderer

Genie.config.cors_headers["Access-Control-Allow-Origin"]  =  "*"
Genie.config.cors_headers["Access-Control-Allow-Headers"] = "Content-Type"
Genie.config.cors_headers["Access-Control-Allow-Methods"] = "GET,POST,PUT,DELETE,OPTIONS"
Genie.config.cors_allowed_origins = ["*"]

#== server ==#

route("/") do
  "File Upload"
end

route("/upload", method = POST) do
  if infilespayload(:img)                 # :img is file-name
    @info filename(filespayload(:img))    # file-name="img"
    @info filespayload(:img).data

    open("upload/file.jpg", "w") do io
      write(io, filespayload(:img).data)
    end
  else
    @info "No image uploaded"
  end

  Genie.Renderer.redirect(:get)
end

isrunning(:webserver) || up()

# Perl

use Mojolicious::Lite -signatures;

# CORS
app->hook(after_dispatch => sub {
    my $c = shift;
    $c->res->headers->header('Access-Control-Allow-Origin' => '*');
});
options '*' => sub ($c) {
   $c->res->headers->header('Access-Control-Allow-Methods' => 'GET, OPTIONS, POST, DELETE, PUT');
   $c->res->headers->header('Access-Control-Allow-Headers' => 'Content-Type');
   $c->render(text => '');
};

post '/upload' => sub ($c) {
   my $uploads = $c->req->uploads('files');

   foreach my $f (@{$uploads}) {
      $f->move_to('/tmp/' . $f->filename);
   }

   $c->render(text => 'Saved!');
};

app->start;

import { createUploaderComponent } from 'quasar'
import { computed } from 'vue'

// export a Vue component
export default createUploaderComponent({
  // defining the QUploader plugin here

  name: 'MyUploader', // your component's name

  props: {
    // ...your custom props
  },

  emits: [
    // ...your custom events name list
  ],

  injectPlugin ({ props, emit, helpers }) {
    // can call any other composables here
    // as this function will run in the component's setup()

    // [ REQUIRED! ]
    // We're working on uploading files
    const isUploading = computed(() => {
      // return <Boolean>
    })

    // [ optional ]
    // Shows overlay on top of the
    // uploader signaling it's waiting
    // on something (blocks all controls)
    const isBusy = computed(() => {
      // return <Boolean>
    })

    // [ REQUIRED! ]
    // Abort and clean up any process
    // that is in progress
    function abort () {
      // ...
    }

    // [ REQUIRED! ]
    // Start the uploading process
    function upload () {
      // ...
    }

    return {
      isUploading,
      isBusy,

      abort,
      upload
    }
  }
})

// globally registering your component in a boot file
import MyUploader from '../../path/to/MyUploader' // the file from above

export default ({ app }) {
  app.component('MyUploader', MyUploader)
}

// or declaring it in a .vue file
import MyUploader from '../../path/to/MyUploader' // the file from above
export default {
  // ...
  components: {
    // ...
    MyUploader
  }
}

import {
  GlobalComponentConstructor,
  QUploaderProps,
  QUploaderSlots,
} from 'quasar';

interface MyUploaderProps extends QUploaderProps {
  // .. add custom props
  freeze: boolean;
  // .. add custom events
  onFreeze: boolean;
}

declare module 'vue' {
  interface GlobalComponents {
    MyUploader: GlobalComponentConstructor<MyUploaderProps, QUploaderSlots>;
  }
}