using .pipe() in node

Question

I'm unclear on what the .pipe() function does in node?

How could I use it to refactor any of the two functions below?

exports.collectData = function(req, callback) { var data = ""; req.on("data", function(chunk) { data += chunk; }) req.on("end", function() { callback(data); }) } http.createServer(function(req, res){ res.writeHead(200, {"Content-type": "text/plain"}); res.write("Howdy"); res.end(); }).listen(port);

//new code from answer:

var fs = require("fs"); // Read File fs.createReadStream("input/people.json") // Write File .pipe(fs.createWriteStream("output/people.json"));

Felix Kling · Accepted Answer · 2015-09-14 14:57:20Z

.pipe connects the readable side of a stream with the writeable side of another stream:

readable.pipe(writable)

I.e. it's a way to pass data from one stream to another. It's the Node equivalent to IUnix pipes:

foo | bar

How could I use it to refactor any of the two functions below?

Since you don't seem to connect two streams there is no need to use .pipe.

@devdropper87: Yes. I recommend to read github.com/substack/stream-handbook .

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