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This is my first question here in stackoverflow, so pardon me if I am missing something!

I'm working on a project related to VPN security. They main goal of the project is to detect if a VPN client is introducing some sort of malware ( spyware included ) in my activity. They may do so in orther to get some proffit out of their VPN, for not many people offer good things for free!

I know Javascript Injection for tracking porposes is a thing. What I want to know is the following:

Is there any way to find if Javascript has been injected by analyzing network traffic? Let's say I don't trust that my VPN is not tracking me by Javascript injection. Could I know by analyzing the traffic on a router?

Thanks in advance, hope I have made myself clear!

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    Put a server out there that has known output. Run it through your VPN, and compare what you get with the known output.
    – Robert Harvey
    Commented Sep 9, 2020 at 18:17
  • Assuming you also have access to the same resources without using the VPN, you could simply use curl/wget and diff to compare the results.
    – pintxo
    Commented Sep 9, 2020 at 18:17
  • Also, source from a reputable vendor.
    – Robert Harvey
    Commented Sep 9, 2020 at 18:19
  • You may get better answers at security.stackexchange.com
    – JoshG
    Commented Sep 9, 2020 at 18:29
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