I Built DevTools for Blazor (Like React DevTools but for .NET)

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

Install the browser extension, open DevTools (F12) on this very page and navigate to the Blazor tab to see Blazor Developer Tools in action! Every major frontend framework has its own DevTools. React has them. Vue has them. Angular has them. I thought it was high time we Blazor developers got ours. 💪 Blazor is an amazing framework — and a unique one. Its internals are more hidden away than most frontend frameworks, which makes building a metrics tool for it genuinely tricky. But those internals are also a fantastic piece of engineering in their own right. Every addition BlazorDevTools makes honors that architecture. We only seek to extend, never to change. Even this demo site is built on…from blazordevelopertools.com

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…

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