Edge Functions
Serverless functions that run on CDN servers closest to your users, reducing latency and enabling faster, personalized experiences.
What are Edge Functions?
Edge Functions are serverless functions that run on the CDN edge, meaning they execute on servers physically closer to your users instead of in one central data center.
They're basically serverless functions with a speed boost. Instead of your code running in us-east-1 and taking 200ms to respond to someone in Tokyo, it runs on a node near Tokyo and responds in 50ms.
Most builders use them for things like auth checks, A/B testing, or personalizing content without the round-trip to your main server. Popular on Vercel, Netlify, and Cloudflare Workers.
They have some limits compared to regular serverless functions. Smaller runtime, can't run heavy processing, and typically support JavaScript/TypeScript only. But for fast, lightweight logic at the edge, they're perfect.
Good to Know
How Vibe Coders Use Edge Functions
Frequently Asked Questions
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Related Terms
Controls how many API requests you can make in a time period to prevent abuse and keep servers stable.
A set of rules that lets different software programs talk to each other and share data or functionality.
The process of moving your code from development to production where real users can access it.
A toolkit with pre-built code, libraries, and docs that lets you build apps for a specific platform without starting from scratch.
Connection points in a network that can send, receive, or process data. Every device in your network is a node.
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