Could not load type 'Fiddler.WebFormats.JSON' from assembly 'Fiddler

[mast76]

It seems that the extension is incompatible with the 2025 versions of Fiddler Classic.

I get this error:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.TypeLoadException: Could not load type 'Fiddler.WebFormats.JSON' from assembly 'Fiddler, Version=5.0.20253.3311, Culture=neutral, PublicKeyToken=null'.
at Google.Protobuf.FiddlerInspector.ProtobufInspectorView.UpdateData()
at Google.Protobuf.FiddlerInspector.ProtobufInspectorView.btnBrowse_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

It might be related to https://feedback.telerik.com/fiddler/1683387-march-update-broke-fiddler-public-api

Progress Telerik Fiddler Classic

v5.0.20253.3311 for .NET 4.6.2
Built: 31. marts 2025

[BlueMatthew]

Yes, WebFormats API was removed. I ask Copilot to write a new JSON parse based on System.Runtime.Serialization.Json. But I have not tested the new code as I don't have protobuf file right now. Could you please test it? Matthew

…

________________________________ 发件人: mast76 ***@***.***> 发送时间: 2025年6月25日 16:30 收件人: BlueMatthew/ProtobufInspector ***@***.***> 抄送: Subscribed ***@***.***> 主题: [BlueMatthew/ProtobufInspector] Could not load type 'Fiddler.WebFormats.JSON' from assembly 'Fiddler (Issue #5) [https://avatars.githubusercontent.com/u/5029645?s=20&v=4]mast76 created an issue (BlueMatthew/ProtobufInspector#5)<#5> It seems that the extension is in compatible with the 2025 versions of Fiddler Classic. I get this error: See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box. ************** Exception Text ************** System.TypeLoadException: Could not load type 'Fiddler.WebFormats.JSON' from assembly 'Fiddler, Version=5.0.20253.3311, Culture=neutral, PublicKeyToken=null'. at Google.Protobuf.FiddlerInspector.ProtobufInspectorView.UpdateData() at Google.Protobuf.FiddlerInspector.ProtobufInspectorView.btnBrowse_Click(Object sender, EventArgs e) at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) It might be related to https://www.telerik.com/forums/new-version-of-classic-fiddler-doesn-t-find-type-fiddler-webformats-json-jsondecode ― Reply to this email directly, view it on GitHub<#5>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AI6VD2BTFV5J7DROHADWCOT3FJMZFAVCNFSM6AAAAACACSCQR2VHI2DSMVQWIX3LMV43ASLTON2WKOZTGE3TINZSGU2DINI>. You are receiving this because you are subscribed to this thread.