Vercel - Official Vercel Runtimes - Vercel
Runtimes are modules that transform your source code into Serverless Functions, which are served by our CDN at the edge. Listed below are all official Runtimes from Vercel. Status: Stable The Node.js Runtime, by default, builds and serves Serverless Functions within the /api directory of a project, providing the files have a file extension of either .js or .ts.
https://vercel.com/docs/runtimes#official-runtimes/node-js/node-js-version