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Bun runtime for Vercel Functions now accepts Bun.serve as an entrypoint

UpdateVerifiedAdded Sep 22, 2026

The Bun runtime for Vercel Functions now supports Bun.serve() as a function entrypoint, including WebSocket handlers. The server you run locally with Bun deploys as-is, without being wrapped in a framework. Enable the runtime by setting "bunVersion": "1.x" in vercel.json .

Read Vercel's release notes

https://vercel.com/changelog/bun-serve-entrypoint-for-vercel-functions

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