Blazor full-stackFull-stack C# web apps without JavaScript
Blazor lets .NET teams build interactive web UIs in C# — shared models, validation, and business logic between server and client. The right choice when your team is .NET-native and wants to avoid context-switching to JavaScript.
Blazor is Microsoft's framework for building interactive web UIs using C# instead of JavaScript. It lets .NET teams share models, validation logic, and business rules between server and client — no context-switching to a different language for the frontend. Blazor offers two hosting models: Blazor Server (UI updates via SignalR WebSocket) and Blazor WebAssembly (full .NET runtime in the browser). Blazor 8+ adds the best of both with automatic render mode selection and streaming SSR. Component libraries like MudBlazor and Radzen provide rich UI components.
Quick start
# Install .NET SDK
# https://dotnet.microsoft.com/download
# Create a new Blazor app
dotnet new blazor -o MyApp
cd MyApp
# Run in development
dotnet watch runRead the full documentation at learn.microsoft.com/en-us/aspnet/core/blazor/
C# in the browser
Write interactive UI logic in C# via WebAssembly — share models, validation, and business logic with your backend.
Blazor Server mode
UI events sent over SignalR with server-side rendering — instant load times and thin client requirements.
Razor components
Reusable .razor components with parameters, cascading values, and lifecycle methods — familiar to any ASP.NET developer.
MudBlazor & Radzen
Rich component libraries with data grids, charts, and form controls — enterprise UI without building from scratch.
EF Core integration
Entity Framework Core for data access — LINQ queries, migrations, and change tracking from your Blazor app.
ASP.NET auth
ASP.NET Identity with cookie, JWT, and external provider auth — role-based access control built into the framework.
Why it's hard
WebAssembly download size
Blazor WASM requires downloading the .NET runtime (~2MB compressed) on first load. AOT compilation can help but increases the published size. Blazor Server avoids this with thin SignalR connections.
JavaScript interop for browser APIs
Some browser features require JavaScript interop (JSInterop). While most common needs are covered by libraries, occasional JS code is needed for cutting-edge browser APIs.
Ecosystem size vs React/Angular
Blazor's component ecosystem is smaller than React's. Libraries like MudBlazor and Radzen fill most gaps, but niche requirements may need custom component development.
Best practices
Use Blazor 8+ auto render mode
Blazor 8's auto render mode serves SSR on first load, then upgrades to interactive WASM — best of both worlds for performance and interactivity.
Share models between server and client
Blazor's key advantage is shared C# code. Create a shared class library for models, validators, and DTOs consumed by both the API and the Blazor frontend.
Use MudBlazor for component library
MudBlazor provides Material Design components for Blazor — data grids, charts, forms, and dialogs with excellent documentation and active development.
Frequently asked questions
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