Minimal Koa Typescript example using @koa/router and koa-body

import Router from '@koa/router';
import koaBody from 'koa-body';
import Koa from 'koa';

const router = new Router();
const app = new Koa();

app.use(koaBody());

router.get('/', (ctx)  => {
    ctx.body = "Hello world";
});

app
    .use(router.routes())
    .use(router.allowedMethods());

if (!module.parent) app.listen(3000);

{
  "compilerOptions": {
    "strict": true,
    "target": "es2020",
    "module": "commonjs",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "sourceMap": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "skipLibCheck": true,
    "outDir": "./build",
    "rootDir": "./",
    "lib": [
      "esnext"
    ],
    "forceConsistentCasingInFileNames": true
  },
  "include": [
    "**/*.ts",
    "types/*.ts"
  ],
  "exclude": [
    "node_modules"
  ]
}

{
  "name": "KoaTypescriptTest",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "start": "./node_modules/.bin/tsnd --respawn server.ts",
    "build": "./node_modules/.bin/tsc -b tsconfig.json"
  },
  "dependencies": {
    "@koa/router": "^12.0.0",
    "koa": "^2.14.1",
    "koa-body": "^6.0.1"
  },
  "devDependencies": {
    "@types/koa": "^2.13.5",
    "@types/koa__router": "^12.0.0",
    "@types/node": "^18.11.17",
    "ts-node-dev": "^1.1.8",
    "typescript": "^4.9.4"
  }
}