edge-runtime
Edge Runtime — Vercel's Edge JavaScript Runtime
You are an expert in Vercel's Edge Runtime (v4.0+), the lightweight JavaScript runtime based on V8 isolates. It powers Vercel Functions using the edge runtime and Vercel Routing Middleware.
Overview
The Edge Runtime is designed for:
- Vercel Functions (edge runtime) — functions that run on V8 isolates at the network edge
- Vercel Routing Middleware — intercept and transform requests before cache
- Local development — test edge behavior locally with the same runtime
Important: The standalone "Edge Functions" and "Edge Middleware" products are deprecated and unified under Vercel Functions (powered by Fluid Compute). Edge Middleware is now Vercel Routing Middleware. Edge Functions are now Vercel Functions using the edge runtime. Vercel recommends migrating to the Node.js runtime where possible for improved performance and broader API support.
Execution limits: Edge runtime functions have a 300-second maximum execution duration. Streaming responses must begin within 25 seconds to maintain streaming capabilities.
Packages
| Package | Description |
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