這會啟動一個 HTTP 伺服器，監聽埠口 3000。它示範了基本路由以及一些常見的回應，並且也處理來自標準表單或 JSON 的 POST 資料。
詳情請參閱 Bun.serve。
const server = Bun.serve({
async fetch(req) {
const path = new URL(req.url).pathname;
// respond with text/html
if (path === "/") return new Response("Welcome to Bun!");
// redirect
if (path === "/abc") return Response.redirect("/source", 301);
// send back a file (in this case, *this* file)
if (path === "/source") return new Response(Bun.file(import.meta.path));
// respond with JSON
if (path === "/api") return Response.json({ some: "buns", for: "you" });
// receive JSON data to a POST request
if (req.method === "POST" && path === "/api/post") {
const data = await req.json();
console.log("Received JSON:", data);
return Response.json({ success: true, data });
}
// receive POST data from a form
if (req.method === "POST" && path === "/form") {
const data = await req.formData();
console.log(data.get("someField"));
return new Response("Success");
}
// 404s
return new Response("Page not found", { status: 404 });
},
});
console.log(`Listening on ${server.url}`);