Simple Deno API Server using standard library

app.ts

import {
  listenAndServe,
  ServerRequest,
} from "https://deno.land/std/http/server.ts";

const options: Deno.ListenOptions = { port: 8000 };

class Router {
  _get: { [k: string]: (req: ServerRequest) => void } = {};

  get(path: string, handler: (req: ServerRequest) => void) {
    this._get[path] = handler;
  }

  route(req: ServerRequest) {
    if (this._get[req.url]) {
      return this._get[req.url](req);
    }
    return req.respond({
      status: 404,
      body: JSON.stringify({ message: "NOT FOUND" }),
    });
  }
}
const router = new Router();
router.get(
  "/",
  (req: ServerRequest) =>
    req.respond({ status: 200, body: JSON.stringify({ message: "Index" }) }),
);
router.get(
  "/hello",
  (req: ServerRequest) =>
    req.respond({ status: 200, body: JSON.stringify({ message: "Hello" }) }),
);
listenAndServe(options, ((req: ServerRequest) => router.route(req)));

app_base.ts

import {
  listenAndServe,
  ServerRequest,
} from "https://deno.land/std/http/server.ts";

const options: Deno.ListenOptions = { port: 8000 };

const handler = (req: ServerRequest) =>
  req.respond({ status: 200, body: "Hello World" });

listenAndServe(options, handler);