---
title: "What is Middleware in ASP.NET Core?"  
description: "What is Middleware in ASP.NET Core?"  
author: "Ravi Vishwakarma"  
published: 2026-03-15  
updated: 2026-03-18  
canonical: https://answers.mindstick.com/qa/116415/what-is-middleware-in-asp-dot-net-core  
category: "asp.net"  
tags: ["asp.net", ".net programming"]  
reading_time: 2 minutes  

---

# What is Middleware in ASP.NET Core?

## Answers

### Answer by Amrith Chandran

**[Middleware in ASP.NET](https://www.mindstick.com/interview/34485/how-to-write-custom-middleware-in-asp-dot-net-core) Core** is a software component that handles HTTP [requests and responses](https://www.mindstick.com/forum/159694/how-to-handle-http-requests-and-responses-in-a-dot-net-core-api-controller) as they move through the application pipeline.

#### Simple Definition

Middleware acts like a **pipeline of components** where each one can:

- Process an incoming request
- Modify it
- Pass it to the next component
- Or stop the request and return a response

#### How It Works

When a request comes into an [ASP.NET Core](https://www.mindstick.com/articles/12946/get-started-with-asp-dot-net-core-mvc-and-visual-studio) app:

1. It enters the middleware pipeline
2. Each middleware component runs in sequence

Each can either:

- Call the next middleware
- Or handle the request and end the pipeline

#### Key Features

- **Request/Response handling**
- **Modular and reusable**
- **Order matters** (execution depends on [registration](https://answers.mindstick.com/qa/116207/what-is-lei-registration) order)
- Can short-circuit the pipeline

#### Common Built-in Middleware

- [Authentication Middleware](https://www.mindstick.com/forum/159306/implement-an-express-js-authentication-middleware-to-protect-routes-from-unauthorized-access)
- [Authorization](https://www.mindstick.com/blog/177/authentication-and-authorization-in-asp-dot-net) Middleware
- [Exception Handling](https://www.mindstick.com/articles/12105/exception-handling-in-java-multiple-exception-handlers) Middleware
- Static File Middleware
- Routing Middleware

#### Example

```cs
public void Configure(IApplicationBuilder app)
{
    app.Use(async (context, next) =>
    {
        await context.Response.WriteAsync("Hello ");
        await next();
        await context.Response.WriteAsync("World!");
    });
}
```

`Output: Hello World!`

#### In Short

Middleware in ASP.NET Core is the **core mechanism that processes HTTP requests in a step-by-step pipeline**, allowing developers to control how requests and responses are handled.


---

Original Source: https://answers.mindstick.com/qa/116415/what-is-middleware-in-asp-dot-net-core

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