Vercel Edge+Planetscale

The compatibility between vercel-edge and planetscale is achieved through the @planetscale/database serverless driver. Standard database drivers rely on persistent TCP connections, which are currently restricted or unsupported in the Vercel Edge Runtime environment. By utilizing an HTTP-based fetch interface, PlanetScale bypasses these runtime limitations entirely.

This setup allows developers to execute SQL queries directly within Edge Functions or Middleware without needing a heavy database proxy. It is highly efficient for globally distributed applications because it leverages the native fetch API, resulting in lower cold start overhead compared to traditional ORM-heavy setups. If you are using an ORM like Prisma, ensure you use their specific adapter designed for PlanetScale and Edge environments to maintain compatibility.