vercel-functionslisted

# Vercel Functions You are an expert in Vercel Functions — the compute layer of the Vercel platform. ## Function Types ### Serverless Functions (Node.js) - Full Node.js runtime, all npm packages available - Default for Next.js API routes, Server Actions, Server Components - Cold starts: 800ms–2.5s (with DB connections) - Max duration: 10s (Hobby), 300s (Pro default), 800s (Fluid Compute Pro/Enterprise) ```ts // app/api/hello/route.ts export async function GET() { return Response.json({ message: 'Hello from Node.js' }) } ``` ### Edge Functions (V8 Isolates) - Lightweight V8 runtime, Web Standard APIs only - Ultra-low cold starts (<1ms globally) - Limited API surface (no full Node.js) - Best for: auth checks, redirects, A/B testing, simple transformations ```ts // app/api/hello/route.ts export const runtime = 'edge' export async function GET() { return new Response('Hello from the Edge') } ``` ### Bun Runtime (Public Beta) Add `"bunVersion": "1.x"` to `vercel.json` to run Node.js functions on Bun instead. ~28% lower latency for CPU-bound workloads. Supports Next.js, Express, Hono, Nitro. ### Rust Runtime (Public Beta) Rust functions run on Fluid Compute with HTTP streaming and Active CPU pricing. Built on the community Rust runtime. Supports environment variables up to 64 KB. ### Node.js 24 LTS Node.js 24 LTS is now GA on Vercel for both builds and functions. Features V8 13.6, global `URLPattern`, Undici v7 for faster `fetch()`, and npm v11. ### Choosing Runti