---
name: Configure TLS on an HTTP server
---
Set the `tls` key to configure TLS. Both `key` and `cert` are required. The `key` should be the contents of your private key; `cert` should be the contents of your issued certificate. Use [`Bun.file()`](/docs/api/file-io#reading-files-bun-file) to read the contents.
```ts
const server = Bun.serve({
fetch: (request) => new Response("Welcome to Bun!"),
tls: {
cert: Bun.file("cert.pem"),
key: Bun.file("key.pem"),
},
});
```
---
By default Bun trusts the default Mozilla-curated list of well-known root CAs. To override this list, pass an array of certificates as `ca`.
```ts
const server = Bun.serve({
fetch: (request) => new Response("Welcome to Bun!"),
tls: {
cert: Bun.file("cert.pem"),
key: Bun.file("key.pem"),
ca: [Bun.file("ca1.pem"), Bun.file("ca2.pem")],
},
});
```
tity-CN
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Jarred Sumner