How to capture network calls in node js?

[Prabhu Venkat]

In firebug addon for firefox there is a tab named 'Net' which captures all the network calls made when we hit an URL from the browser

I can request the URL from code but i am finding ways to capture the network calls being made, get the request parameters passed in the network call

Can this be done using NodeJS?

[Aria Stewart]

On Oct 23, 2015, at 3:05 AM, Prabhu Venkat <prabh...@gmail.com> wrote:

In firebug addon for firefox there is a tab named 'Net' which captures all the network calls made when we hit an URL from the browser

I can request the URL from code but i am finding ways to capture the network calls being made, get the request parameters passed in the network call

Can this be done using NodeJS?=

Not entirely easily! That kind of tracing infrastructure is complicated and sometimes performance-altering, and it hasn't been built.

What I do for unencrypted connections is use tcpdump, ngrep or wireshark to snoop on the traffic and interpret it from a network capture.

With encrypted connections, things get much more difficult and I don't have great strategies short of 'attach debugger to the https library, watch what it does'.

Aria

[Matt]

You can run your code with:

NODE_DEBUG=http node app.js

And it will give you some level of debugging to stderr. It may or may not be enough - it mostly sends error conditions out.

There are a few other NODE_DEBUG values you can use. There's an article on using it here: http://www.juliengilli.com/2013/05/26/Using-Node.js-NODE_DEBUG-for-fun-and-profit/

Matt.

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