.NET CORE WEB API

What is .NET Core Web API?

.NET Core Web API is a framework for building HTTP-based RESTful services that can be used by web, mobile, or desktop applications to communicate with a server.

It is part of ASP.NET Core, the modern, cross-platform, open-source version of .NET.

In Simple Terms: A Web API allows applications to send and receive data over the internet — usually in JSON format — using HTTP requests like GET, POST, PUT, DELETE.

Key Features of .NET Core Web API

Why Use a Web API?

Because it allows:

• Mobile Apps (Android/iOS) to get data from your backend

• Web Applications (Angular, React, Vue) to interact with your database

• Third-Party Integrations (like payment gateways or analytics)

• IoT Devices to send/receive data

Basic Architecture of .NET Core Web API

Client (Browser / Mobile App)
       |
       | HTTP Request (GET, POST, PUT, DELETE)
       ?
 ASP.NET Core Web API
 +-- Controller (Handles request)
 +-- Service (Business logic)
 +-- Repository (Database operations)
 +-- Database (SQL Server, Oracle, etc.)
       ?
       | JSON Response
       |
Client (Displays data)

Example: Simple .NET Core Web API

Step 1 : Create a Project

In Visual Studio or CLI:

dotnet new webapi -n MyWebAPI

Step 2 : Create a Model

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Department { get; set; }
}

Step 3 : Create a Controller

[ApiController]
[Route("api/[controller]")]
public class EmployeesController : ControllerBase
{
    private static List employees = new List
    {
        new Employee{ Id = 1, Name = "Sandhiya", Department = "IT" },
        new Employee{ Id = 2, Name = "Priya", Department = "HR" }
    };

    [HttpGet]
    public IEnumerable GetAll()
    {
        return employees;
    }

    [HttpPost]
    public IActionResult Add(Employee emp)
    {
        employees.Add(emp);
        return Ok(emp);
    }
}

Step 4 : Run and Test

Run the project (Ctrl + F5) and open:

https://localhost:5001/api/employees

You’ll see data in JSON format

Common HTTP Methods Used

Important Components

Extra Features

• Authentication & Authorization (JWT, OAuth)

• Entity Framework Core (Database operations)

• Swagger (API Documentation)

• Dependency Injection

• Logging & Exception Handling

Summary

if you love to read- use the below links

https://learn.microsoft.com/en-us/aspnet/core/tutorials/first-web-api?view=aspnetcore-9.0&tabs=visual-studio

https://dotnettutorials.net/course/asp-net-web-api/

https://www.tutorialsteacher.com/webapi

https://medium.com/@solomongetachew112/asp-net-core-web-api-8-a-complete-beginners-guide-d816a73bb45f

if you are a visual person

https://www.youtube.com/watch?v=kbc6jH_CI2c

i believe these are sufficient ennough to begin with

https://www.youtube.com/playlist?list=PL18HZjtdIA4DiYGQj1zst6myBAVE3wgMg

This was helpful when i Started my Carrier