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How do you stream a csv file into a node web app?


How do you stream a csv file into a node web app?

By : Simón Castillo
Date : November 22 2020, 10:38 AM
I wish this help you https://www.npmjs.com/package/busboy https://www.npmjs.com/package/fast-csv
code :
var Busboy = require('busboy'); // to handle the form
var csv = require('fast-csv');

function (req, res) {
  var busboy = new Busboy({ headers: req.headers });
  busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
    file.pipe(csv())
      .on('data', function (data) {
        console.log('YAY, just the data I wanted!', data);
      });
  });
  busboy.on('finish', function() {
    console.log('Done parsing form!');
    res.end();
  });
  req.pipe(busboy);
}


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Uploading file using Node to a stream without first writing to temp file disk?

Uploading file using Node to a stream without first writing to temp file disk?


By : user3703616
Date : March 29 2020, 07:55 AM
it should still fix some issue Turns out the Formidable team is working on making this scenario much easier with Node.js streams. When the issue is fixed this will become much easier.
https://github.com/felixge/node-formidable/issues/61
Sending stream of data in response - node.js - Azure File service using node.js

Sending stream of data in response - node.js - Azure File service using node.js


By : Psyk
Date : March 29 2020, 07:55 AM
hop of those help? The NodeJS Class http.ServerResponse implements the Writable Stream interface, please refer to the NodeJS API https://nodejs.org/api/http.html#http_class_http_serverresponse and https://nodejs.org/api/stream.html#stream_class_stream_writable_1.
So you just need to use the object response instead of the stream writer fs.createStreamWriter(...) in the sample code "getFileToStream" http://azure.github.io/azure-storage-node/#toc8 when you send data stream into response for NodeJS.
code :
var http = require('http');
var azure = require('azure-storage');
var fileService = azure.createFileService('<storage_key_name>','<storage_access_key>');

http.createServer(function (request, response) {
    var shareName = request.headers.sharename;
    var dirPath = request.headers.directorypath;
    var fileName = request.headers.filename;
    response.setHeader('Content-Type', 'application/json');
    fileService.getFileToStream(shareName, dirPath, fileName, response, {disableContentMD5Validation: true}, function(error, result, response) {
            if(!error) {
                    //console.log(result);
                    //console.log(response);
                   if(response.isSuccessful) {
                                console.log("Success!");
                   }
            }
    });
}).listen(1337, "127.0.0.1");

console.log('Server running at http://127.0.0.1:1337/');
create css file from scss / sass stream with json object stream using gulp in node

create css file from scss / sass stream with json object stream using gulp in node


By : ebsman99
Date : March 29 2020, 07:55 AM
To fix the issue you can do This assumes you have assigned your json string to a variable named obj
code :
function streamifyText(text) {
    var s = new stream.Readable();
    s._read = function noop() {};
    s.push(text);
    s.push(null);
    return s;
}
gulp.task('sass', function () {

    var combinedStream = CombinedStream.create();
    combinedStream.append(streamifyText(JSON.stringify(obj)).pipe(vinylSourceStream('anyName.json')));
    combinedStream.append(fs.createReadStream('./some.scss').pipe(vinylSourceStream('anyName.scss')));

    combinedStream
        .pipe(vinylBuffer())
        .pipe(gulpJsonSass({sass: false}))
        .pipe(gulpConcat('combined.scss'))
        .pipe(gulpSass().on('error', gulpSass.logError))
        .pipe(gulp.dest('out/'));
});
Node.js transform file stream and write to same file results in empty file

Node.js transform file stream and write to same file results in empty file


By : vikram
Date : March 29 2020, 07:55 AM
I hope this helps you . This is not a problem with your transformer code but a problem that you open a file for writing that you overwrite probably before you even read anything from it.
It would be the same in shell. If you run:
code :
cat < file.txt > file.txt
tr a-z A-Z < x.txt > x.txt
how to create node server that receiving video stream and save the stream as video file?

how to create node server that receiving video stream and save the stream as video file?


By : Abdullah Al Mamun
Date : March 29 2020, 07:55 AM
hop of those help? For example: you can convert stream to Binary Data and send this: Sending_and_Receiving_Binary_Data
Also you can use MediaStream Recording API, if you want to process video\audio stream: docs
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