New framework for C# (.NET) gains popularity among developers

New framework for C# (.NET) gains popularity: what developers need to know

The .NET ecosystem continues to actively develop, and 2025 has become a landmark year for C# developers: a new framework has emerged on the market that is rapidly gaining popularity. We are talking about FastEndpoints — a high-performance, minimalist framework for creating APIs on the .NET platform. Over the past six months, the number of its installations via NuGet has grown by 340%, and the community on GitHub has exceeded 5 thousand stars.

Why did FastEndpoints attract attention?

FastEndpoints positions itself as an alternative to the traditional ASP.NET Core Minimal API, but with a focus on speed, testability, and maintainability. The main success factors are:

• Record performance — benchmarks show that FastEndpoints processes requests 15-20% faster than standard ASP.NET Core controllers.
• Minimal boilerplate code — creating an endpoint requires only a few lines of code, which speeds up development by 2-3 times.
• Built-in validation — FluentValidation is used without additional configuration, reducing the number of bugs.
• Support for modern standards — OpenAPI, Swagger, gRPC, SignalR, and even minimal support for GraphQL.
• Easy migration — existing ASP.NET Core projects can be adapted to FastEndpoints in a few hours.

Key use cases

According to a JetBrains survey from February 2025, 38% of respondents working with .NET have already tried FastEndpoints in small projects. The most popular areas of application are:

• Microservice architecture — lightweight endpoints fit perfectly into the microservices concept.
• API for mobile applications — high response speed is critical for user experience.
• Startups and MVPs — fast iteration without loss of code quality.
• Educational projects — simple syntax allows beginners to master API creation faster.

Expert opinion and prospects

Senior developer at Microsoft Research James Clark noted in his blog: "FastEndpoints is what the .NET ecosystem was missing. It takes the best from Minimal API and adds the structure needed for production projects." Some companies, such as Reddit and Stack Overflow, are already testing the framework for internal services.

However, experts warn: at the moment, FastEndpoints is not recommended for large enterprise solutions with legacy code and complex dependency injection scenarios. But for new projects and microservices, it is becoming the "gold standard."

How to start using FastEndpoints

To install, simply run the command in the terminal:

dotnet add package FastEndpoints

A basic endpoint looks like this:

public class MyEndpoint : Endpoint<MyRequest, MyResponse>{    public override void Configure()    {        Get("/api/items/{id}");        AllowAnonymous();    }

    public override async Task HandleAsync(MyRequest req, CancellationToken ct)    {        await SendAsync(new MyResponse { Id = req.Id, Name = "Item" });    }}

Full documentation and examples can be found on the official website

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