Bun

Run Nitro apps with Bun runtime.

Preset: bun

Nitro output is compatible with the Bun runtime. While the default Node.js output also runs in Bun, building with the bun preset enables Bun-specific optimizations.

After building with the bun preset, start the production server with:

bun run ./.output/server/index.mjs

#Environment Variables

You can customize server behavior with the following environment variables:

NITRO_PORT or PORT (defaults to 3000)
NITRO_HOST or HOST
NITRO_UNIX_SOCKET - When set to a socket file path, the server listens on it instead of a TCP port, ignoring NITRO_PORT/PORT and NITRO_HOST/HOST.
NITRO_SSL_CERT and NITRO_SSL_KEY - When both are set, the server launches in HTTPS mode. This is intended for testing only; in production, run the Nitro server behind a reverse proxy that terminates SSL.

NITRO_UNIX_SOCKET=./app.sock bun run ./.output/server/index.mjs

You can also set Bun-specific listener options in the server entry, for example to listen on a UNIX socket:

server.ts

export default {
  bun: { unix: "./app.sock" },
  fetch() {},
};