Edge Functions di Vercel

Vercel Edge Functions menjalankan kode di edge network menggunakan V8 runtime (sama seperti Cloudflare Workers). Terintegrasi sempurna dengan Next.js.

Edge Middleware

// middleware.ts (Next.js)
import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

export function middleware(request: NextRequest) {
  // Redirect berdasarkan geolocation
  const country = request.geo?.country || "US";

  if (country === "ID") {
    return NextResponse.rewrite(new URL("/id", request.url));
  }

  // Auth check
  const token = request.cookies.get("session");
  if (!token && request.nextUrl.pathname.startsWith("/dashboard")) {
    return NextResponse.redirect(new URL("/login", request.url));
  }

  return NextResponse.next();
}

export const config = {
  matcher: ["/((?!_next|static|favicon.ico).*)"],
};

Edge API Routes

// app/api/hello/route.ts
export const runtime = "edge"; // Deploy ke edge, bukan serverless

export async function GET(request: Request) {
  return Response.json({
    message: "Hello from edge!",
    region: process.env.VERCEL_REGION,
  });
}

Kapan Edge vs Serverless?

• Edge — Auth, redirects, A/B testing, geolocation, caching. Tidak bisa akses Node.js APIs penuh.
• Serverless — Database queries, file processing, heavy computation. Full Node.js runtime.