How can I edit a js file sent by the server before it gets to my browser?

Posted by pstone on Stack Overflow See other posts from Stack Overflow or by pstone
Published on 2010-04-27T22:40:02Z Indexed on 2010/04/27 22:43 UTC
Read the original article Hit count: 146

Filed under:

JavaScript

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network-programming

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packet-capture

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pcap

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scapy

During a normal browsing session I want to edit a specific javascript file before the browser receives since once it gets there it's impossible to edit. Is there are any tool for this? For what I need it I can't just save it and edit it on my disk.

I'm ready to learn how to program it myself but if anyone can point out more or less what I have to do I'd be very grateful. I'd have to intercept the packets until I have the whole file while blocking the browser from receiving it any part of it, then edit it manually and forward it to the same port.

I don't think I can do this by just using pcap, I've read a bit about scapy but I'm not sure if it can help me either.

Thanks in advance.

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