Development / backend API development

Build a Complete Product CRUD API with ASP.NET Core (.NET 10)

Ravi Kumar January 13, 20263 Min Read

Creating a clean, well-documented CRUD API is a foundational skill for modern backend development. In this guide, we’ll walk through a production-ready Product CRUD API built with ASP.NET Core Web API (.NET 10, C# 14)—covering design principles, full controller logic, testing, Swagger integration, and clear next steps for scaling to production.

Overview

This API demonstrates RESTful best practices using a simple in-memory store to keep the focus on clarity and correctness. It’s ideal for learning, demos, interviews, and as a starting point for real projects.

What you’ll get

Full CRUD operations (Create, Read, Update, Delete)
Clean REST endpoints and named routes
Correct HTTP status codes
Strongly-typed responses
Swagger/OpenAPI for instant testing
Clear testing workflows (.http, Swagger, Postman)

Typical use cases

E-commerce product catalogs
Inventory management systems
Mobile app backends
Third-party integrations

Product Model

Location: CRUD Operation/Product.cs namespace CRUD_Operation

csharpMSI Editor

Reader Responses

{ [ApiController] [Route("[controller]")] public class ProductController : ControllerBase { private static List<Product> _products = new(); private static int _nextId = 1; [HttpGet(Name = "GetProducts")] public ActionResult<IEnumerable<Product>> Get() { return Ok(_products); } [HttpGet("{id}", Name = "GetProductById")] public ActionResult<Product> GetById(int id) { var product = _products.FirstOrDefault(p => p.Id == id); return product == null ? NotFound() : Ok(product); } [HttpPost(Name = "CreateProduct")] public ActionResult<Product> Create([FromBody] Product product) { product.Id = _nextId++; _products.Add(product); return CreatedAtRoute("GetProductById", new { id = product.Id }, product); } [HttpPut("{id}", Name = "UpdateProduct")] public ActionResult<Product> Update(int id, [FromBody] Product product) { var existing = _products.FirstOrDefault(p => p.Id == id); if (existing == null) return NotFound(); existing.Name = product.Name; existing.Description = product.Description; existing.Price = product.Price; existing.Stock = product.Stock; existing.Category = product.Category; return Ok(existing); } [HttpDelete("{id}", Name = "DeleteProduct")] public ActionResult Delete(int id) { var product = _products.FirstOrDefault(p => p.Id == id); if (product == null) return NotFound(); _products.Remove(product); return NoContent(); } } }

Murmu Software Infotech

Build a Complete Product CRUD API with ASP.NET Core (.NET 10)

Overview

What you’ll get

Typical use cases

Product Model

Join the Conversation

Why this design?

ProductController (Complete CRUD)

Design Secure, Scalable APIs That Power Real Business Growth

Key highlights

CRUD Operations Explained (Quick)

Create (POST /product)

Read All (GET /product)

Read by ID (GET /product/{id})

Update (PUT /product/{id})

Delete (DELETE /product/{id})

API Endpoints

Testing Options

Swagger Setup (Program.cs)

Best Practices Used

Recommended for Production

Production Enhancements (What to Add Next)

Troubleshooting Tips

Final Thoughts

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