What is Edge Runtime?
TL;DR
Lightweight JavaScript runtime used by Frontend Accelerator that runs on CDN edge nodes globally for ultra-fast response times.
Edge Runtime in used within Frontend Accelerator is a lightweight JavaScript environment that runs on CDN edge nodes worldwide, providing ultra-low latency for dynamic content.
Usage:
export const runtime = 'edge';
Benefits:
- Global distribution on CDN edges
- Sub-10ms cold starts
- Unlimited scalability
- Lower costs than Node.js runtime
Use Cases:
- Middleware for auth checks
- A/B testing and personalization
- Geolocation-based routing
- API routes with fast response times
Limitations: No access to full Node.js APIs, limited to Web APIs.
AI-friendly: Explicit runtime declaration makes deployment target clear.