The runtime option allows you to select the JavaScript runtime used for rendering your route.

export const runtime = 'nodejs'
// 'nodejs'

export const runtime = 'nodejs'
// 'nodejs'

• 'nodejs' (default)
• 'edge' (deprecated)

Good to know:

• The Edge Runtime is deprecated. Remove the runtime export from your route files. See Edge Runtime Deprecated.
• This option cannot be used in Proxy.

Source: docs/01-app/03-api-reference/03-file-conventions/02-route-segment-config/runtime.mdx