Rest-Api

We have a database. We have JSON serialization. Now it is time to build a real REST API. In this tutorial, you will build full CRUD (Create, Read, Update, Delete) operations for notes and users. You will learn the repository pattern, proper HTTP status codes, validation, and how to organize a production-ready API. The Repository Pattern In the previous tutorial, we put database queries directly in route handlers. This works for small projects but becomes messy as your API grows. ...

Routing is the core of any backend framework. It maps URLs to code that handles requests and sends responses. In this tutorial, you will learn how to define routes in Ktor, handle different HTTP methods, use path and query parameters, group routes, and handle errors properly. How Routing Works in Ktor Every Ktor route has three parts: HTTP method — GET, POST, PUT, DELETE, etc. Path — The URL pattern like /api/users/{id} Handler — The code that runs when a request matches routing { get("/hello") { // method + path call.respondText("Hi") // handler } } When a client sends GET /hello, Ktor finds the matching route and runs the handler. ...