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Blazor

.NET's C# framework for building interactive web UIs.

Official site
Monthly cost
Free
Popularity
2/5
LLM knowledge
3/5
Difficulty
Hard
bundle: server-heavy
#enterprise

What Blazor is good at

Strengths
  • +Share code with .NET backend
  • +C# in the browser
  • +Strong tooling
Tradeoffs
  • Large WASM bundles
  • Niche ecosystem

Coding-agent prompt

You're working with Blazor. .NET's C# framework for building interactive web UIs.

Best practices:
- Lean on: share code with .net backend
- Lean on: c# in the browser
- Lean on: strong tooling

Things to watch for:
- Watch out for: large wasm bundles
- Watch out for: niche ecosystem

General guidance:
- Canonical docs: https://blazor.net — check here before inventing APIs.
- Keep secrets in environment variables, never commit them.
- Write TypeScript where the ecosystem supports it; add types to every exported function.
- Add tests for the critical paths before declaring the task done.
- Read-the-docs is usually faster than guessing — cite the docs page in code comments when you apply a non-obvious pattern.

Beginner's guide to Blazor

In one line: Build interactive web UIs using C# instead of JavaScript.

Blazor is Microsoft's framework for writing web UIs in C#. It runs either in the browser via WebAssembly or on the server. Great if your team already knows .NET.

Try it in your terminal
  • dotnet new blazor -o my-app

    Create a new Blazor app (requires the .NET SDK).

  • cd my-app && dotnet run

    Build and run it.

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