I Built DevTools for Blazor (Like React DevTools but for .NET)
Hi HN! I've been working on developer tools for Blazor that let you inspect Razor components in the browser, similar to React DevTools or Vue DevTools. The problem: Blazor is Microsoft's frontend framework that lets you write web UIs in C#. It's growing fast but lacks the debugging tools other frameworks have. When your component tree gets complex, you're stuck with Console.WriteLine debugging. What I built: A browser extension + NuGet package that: Shows the Razor component tree in your browser Maps DOM elements back to their source components Highlights components on hover Works with both…
In plain words
This is a browser extension and NuGet package for inspecting Razor components in Blazor applications, similar to React DevTools. It displays the component tree in the browser, maps DOM elements back to source components, and highlights components on hover. The tool works with both Blazor Server and WebAssembly by injecting markers during compilation that the extension reads to reconstruct the component hierarchy. It addresses the debugging gap in Blazor, which previously lacked such inspection capabilities.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN! I've been working on developer tools for Blazor that let you inspect Razor components in the browser, similar to React DevTools or Vue DevTools. The problem: Blazor is Microsoft's frontend framework that lets you write web UIs in C#. It's growing fast but lacks the debugging tools other frameworks have. When your component tree gets complex, you're stuck with Console.WriteLine debugging. What I built: A browser extension + NuGet package that: Shows the Razor component tree in your browser Maps DOM elements back to their source components Highlights components on hover Works with both Blazor Server and WASM How it works: The NuGet package creates shadow copies of your .razor files and injects invisible markers during compilation. These markers survive the Razor→HTML pipeline. The browser extension reads these markers to reconstruct the component tree. Current status: Beta - it works but has rough edges. Found some bugs when testing on larger production apps that I'm working through. All documented on GitHub. Technical challenges solved: Getting markers through the Razor compiler without breaking anything Working around CSS isolation that strips unknown attributes Making it work with both hosting models It's completely open source: https://github.com/joe-gregory/blazor-devtools Demo site where you can try it: https://blazordevelopertools.com Would love feedback, especially from anyone building production Blazor apps. What debugging pain points do you have that developer tools could solve?
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