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2026-08-27 21:09:14 +00:00

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---
title: Configure TLS on an HTTP server
sidebarTitle: Configure TLS
mode: center
---
Set the `tls` key to configure TLS. Both `key` and `cert` are required: `key` is the contents of your private key and `cert` is the contents of your issued certificate. Use [`Bun.file()`](/runtime/file-io#reading-files-bun-file) to read them.
```ts server.ts icon="/icons/typescript.svg"
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 Mozilla-curated list of well-known root CAs. To override this list, pass an array of certificates as `ca`. On a server, Bun uses this list to verify _client_ certificates, so also set `requestCert: true`.
```ts server.ts icon="/icons/typescript.svg"
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")],
requestCert: true,
},
});
```