File upload in Node.js to an Express server, using streams

client.js

// node: v0.10.21
// request: 2.27.0
var request = require('request');
var fs = require('fs');

var r = request.post("http://server.com:3000/");
// See http://nodejs.org/api/stream.html#stream_new_stream_readable_options
// for more information about the highWaterMark
// Basically, this will make the stream emit smaller chunks of data (ie. more precise upload state)
var upload = fs.createReadStream('f.jpg', { highWaterMark: 500 });

upload.pipe(r);

var upload_progress = 0;
upload.on("data", function (chunk) {
  upload_progress += chunk.length
  console.log(new Date(), upload_progress);
})

upload.on("end", function (res) {
  console.log('Finished');
})

server.js

// node: v0.10.7
// express: 3.4.4
var fs = require('fs');
var express = require('express');

var app = express();
app.post('/', function (req, res, next) {
  req.pipe(fs.createWriteStream('./uploadFile'));
  req.on('end', next);
});

app.listen(3000);

Hi, I try it and its work! Very nice... but what if I want receive a streamed big file from a ejs page?

thanks

I need to receive video file from post request then need to upload on youtube server. This code is not working in this case. kindly suggest thanks.

options.headers = {
            "Content-Type": "application/octet-stream",
            "Content-Disposition": "attachment"
        };

I would recommend to set the Content-Type in request. Because using express body parsers will stop the data stream and the upload will hang if the streamed data contains json like structures or urls.

THANKS <3

hi I have one doubt how to save the data in the file in express.js

How to to open uploaded file?
The req.on('end', next) means that piping is finished.
What if it is needed to open the file when it is uploaded?

UPD

var upload fs.createWriteStream('./uploadFile')
await req.pipe(upload);
upload.on('close', () => {
     // upload is ready
}