.NET library to interact with the Chrome Debugger
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Latest commit 049ba9e May 16, 2018


NuGet version


C# Library to interact with the Chrome Developer Tools.

    chromeSession.Subscribe<Protocol.Page.DomContentEventFiredEvent>(domContentEvent =>
        Console.WriteLine("DomContentEvent: " + domContentEvent.Timestamp);
    chromeSession.SendAsync(new NavigateCommand
        Url = "http://www.google.com"


This library is C# API that enabled interaction with the Chrome Developer Tools. When the Chrome Developer Tools are started, the chrome process starts a server. The Chrome Developer Tools UI communicates with this server via Web Sockets. So can you. In fact, everything in the Chrome Developers Tools UI is available to you via JSON, by default. This library makes it available to you in C#.

Communication with this server is defined in a protocol.json file. This is subject to change at any time. Below are instructions what to do if this library becomes out of date with the protocol.


Contained in this repo are 3 projects.

How it works

I've included a code example. Check it out and read no further. Wait, no. Keep reading!

Chrome Developer Tools

The Chrome Developer Tools have a pretty cool API. There are 2 basic types of objects that the Developer Tools understand:

  • Events
    • These events will only be received by you
    • The are events triggered by page events, network events, the DOM, or something else.
    • You can tell Chrome to enable, or disable, domain events using ... commands (keep reading)
  • Commands
    • A command is an object that you will send to the Developer Tools. This command will generate a response (or an error response).
    • Every Command has a CommandResponse


If you made it this far, it's best to read the sample - Program.cs.

Library out of date?

If you didn't read the entire README (I don't blame you, I wouldn't), I've included a project in this repository which allows anyone to rebuild the protocol. Following these steps:

  1. Download the latest protocol.json file and replace this one
  2. Build & run MasterDevs.ChromeDevTools.ProtocolParser
  3. Copy the contents of the OutputProtocol directory and paste it into (overwrite everything!) the Protocol directory
  4. Submit a pull request so others can benefit! (optional)