ELI5: edge functions
// explanation
What are edge functions?
Edge functions are little computer programs that run very close to where you are—like having a helper standing right next to you instead of far away in a data center [1][3]. They're written in TypeScript and can do tasks like collecting information or sending notifications [4].
Why are they special?
Instead of sending a request all the way across the country to a server and waiting for an answer, edge functions work nearby, so you get answers super fast [3]. It's like asking a question to someone standing next to you instead of shouting across a football field [1].
What can you do with them?
You can use edge functions to listen for webhooks, collect data from other websites, send push notifications, or handle special requests from your website visitors [1][4].
Are they ready to use?
While edge functions are becoming popular, some people say they still have limits—like struggling when too many people use them at the same time [2].
// sources
Edge Functions are server-side TypeScript functions, distributed globally at the edge—close to your users. They can be used for listening to webhooks ...
Sep 14, 2024 ... I thought edge functions can be used to serve as API routes - it seems to me if they cannot even handle 100 concurrent requests they are nowhere near ...
May 19, 2022 ... Edge functions give developers additional powers to execute serverless functions not within a broad region, but in the location closest to the ...
Feb 27, 2025 ... I use them to collect data from a third party API under various situations or kicked off from a cron. I also use them for push notifications.
Apr 16, 2026 ... Edge Functions connect our platform with an open runtime standard at the network edge, allowing fast, personalized web experiences in a dev ...
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Video by Tuomo Kankaanpää
