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I'm looking for an app/program that can show another program full activity, such as what kind of data (text, numbers, hash, or Decrypted) has been sent, where data is sent and/or received data from an internet source or local source.

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  • For which operating system? Must it be gratis, or do you have a budget?
    – Mawg
    Commented Aug 12, 2021 at 8:21

2 Answers 2

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If it's a browser app, obviously you can just hot F12 for developer tools & look in the network app.

If not, then WireShark, as answered by @gfdsweds will certain do the job. It's that we ever use in the office/lab. It's free, powerful and can also decode a lot of common data formats.

Wireshark can be a little overwhelming, though, so you might want to look at Fidller, which is free, cross-platform and easy to use.

If you want to test your own programs, instead of spy on others, then use the renouned Postman.

Btw, you are going to have problems with

where data is sent and/or received data from an internet source or local source.

because Windows sends local HTTP traffic (localhost / http:127.0.0.1) directly and does not use the TCP/IP stack, which is what all of the other tools hook into.

BUT, there is hope. Read these & search for more:

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I haven't used it but have heard good things, for internet sources I think glasswire would fulfill that for windows.

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    Glasswire does not track what programs/apps are sending/receiving.. :/ Commented Mar 15, 2021 at 10:12
  • "Detect hidden threats with GlassWire's Firewall" is what it's webpage says at the top.
    – Mawg
    Commented Aug 12, 2021 at 8:14

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