# Ktor — Async Web Framework for Kotlin by JetBrains

> Ktor is a framework for quickly creating connected applications in Kotlin with minimal effort. Built by JetBrains, it supports coroutines natively, runs on multiple engines (Netty, CIO, Jetty), and works for server + client HTTP in Kotlin Multiplatform.

## Install

Save in your project root:

## Quick Use

```bash
# Via IntelliJ IDEA or Gradle
gradle init --type kotlin-application
```

Add to `build.gradle.kts`:
```kotlin
plugins {
    id("io.ktor.plugin") version "3.0.0"
    kotlin("plugin.serialization") version "2.0.0"
}

dependencies {
    implementation("io.ktor:ktor-server-core")
    implementation("io.ktor:ktor-server-netty")
    implementation("io.ktor:ktor-server-content-negotiation")
    implementation("io.ktor:ktor-serialization-kotlinx-json")
}
```

```kotlin
fun main() {
    embeddedServer(Netty, port = 8080) {
        install(ContentNegotiation) { json() }

        routing {
            get("/api/assets") {
                call.respond(listOf(Asset("react", 230000)))
            }
            post("/api/assets") {
                val asset = call.receive<Asset>()
                call.respond(HttpStatusCode.Created, asset)
            }
        }
    }.start(wait = true)
}

@Serializable
data class Asset(val repo: String, val stars: Int)
```

## Intro

Ktor is a framework by JetBrains for quickly creating connected applications in Kotlin. Fully coroutine-based from the ground up, Ktor provides both server and client HTTP functionality. Runs on Netty, CIO, Jetty, or Tomcat engines and supports Kotlin Multiplatform for shared networking code.

- **Repo**: https://github.com/ktorio/ktor
- **Stars**: 14K+
- **Language**: Kotlin
- **License**: Apache 2.0

## What Ktor Does

- **Server** — HTTP server with routing, content negotiation
- **Client** — HTTP client with multiplatform support
- **Coroutines** — native suspend functions throughout
- **Plugins** — Authentication, CORS, Sessions, WebSocket, Call Logging
- **Serialization** — kotlinx.serialization, Gson, Jackson
- **WebSocket** — built-in support
- **Multiple engines** — Netty, CIO, Jetty, Tomcat
- **Multiplatform** — client works on JVM, iOS, JS, Native

## Comparison

| Framework | Language | Async Model |
|---|---|---|
| Ktor | Kotlin | Coroutines |
| Spring Boot | Java/Kotlin | Threads + WebFlux |
| Micronaut | Java/Kotlin | Compile-time DI |
| Quarkus | Java/Kotlin | CDI + Reactive |

## 常见问题 FAQ

**Q: Ktor vs Spring Boot？**
A: Ktor 更轻量、纯 Kotlin、coroutine-native；Spring Boot 生态更大、企业功能更多。小中型 Kotlin 项目用 Ktor 很爽。

## 来源与致谢 Sources

- Docs: https://ktor.io/docs
- GitHub: https://github.com/ktorio/ktor
- License: Apache 2.0

---
Source: https://tokrepo.com/en/workflows/41300248-3634-11f1-9bc6-00163e2b0d79
Author: AI Open Source