Vercel Services: Running Full-Stack Applications on Vercel

Previously, when using different frameworks such as a Next.js frontend and a FastAPI backend, you had to deploy them to different clouds and go through complex workflows.

The newly introduced Vercel Services lets you run multiple frameworks simultaneously within a single Vercel project. This provides Atomic deployments, where the frontend and backend are deployed and rolled back together, Shared preview deployments, which instantly reflect changes across all services, and Internal service communication, which doesn't go through the public internet.

Developers simply declare their services using the services key in the vercel.json file. Vercel automatically handles routing, building, deployment, and Auto-scaling in the production environment.

In particular, the Service bindings feature ensures that traffic between services never leaves the Vercel network. This not only strengthens security but also allows multiple independent services to be managed together as if they were a single connected application.