Vercel Edge Runtime

A high-performance JavaScript execution environment built on V8 for deploying low-latency code at Vercel's network edge.

Vercel Edge Runtime strips away Node.js overhead to deliver near-instant cold starts and zero-millisecond execution latency. By leveraging the V8 engine and standard Web APIs (like Fetch, Request, and Response), it enables developers to run dynamic logic—such as A/B testing, authentication checks, and geo-specific content delivery—closer to the user. This environment supports a subset of Node.js modules while prioritizing security through strict isolation, making it the default choice for high-traffic Next.js Middleware and Edge Functions.

https://vercel.com/docs/functions/edge-functions/edge-runtime