# Build an HTTP server using Express and Bun

Express and other major Node.js HTTP libraries should work in Bun without changes. Bun implements the [`node:http`](https://nodejs.org/api/http.html) and [`node:https`](https://nodejs.org/api/https.html) modules that these libraries rely on.

<Note>See [Node.js compatibility](/runtime/nodejs-compat#node-http) for details.</Note>

```sh terminal icon="terminal"
bun add express
```

---

To define an HTTP route and start a server with Express:

```ts server.ts icon="/icons/typescript.svg"
import express from "express";

const app = express();
const port = 8080;

app.get("/", (req, res) => {
  res.send("Hello World!");
});

app.listen(port, () => {
  console.log(`Listening on port ${port}...`);
});
```

---

To start the server on `localhost`:

```sh terminal icon="terminal"
bun server.ts
```