Collapsing frontend and API with Next.js

This is the core product trick behind Next.js and Vercel, they turn frontend engineers into full stack teams by collapsing the app and the API into one codebase. Instead of maintaining a React app in one repo and a Rails or Node service in another, a team can put request handlers under app/api or pages/api, deploy the whole project together, and let Vercel package those server side endpoints as functions.

• In practice, this means the same project folder can hold a page component, the form that calls an endpoint, and the server code that talks to Stripe, Supabase, or another API. Next.js documents API Routes and Route Handlers as built in server side endpoints, not separate services.
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• The workflow gain is mostly about reducing glue work. The interview and related Jamstack research describe Vercel as packaging these handlers into lambdas automatically, which removes the need to set up and operate a separate backend deploy pipeline for many startup use cases.
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• This is also where Vercel differs from a more general cloud setup like AWS or a split frontend and backend stack. The developer keeps one JavaScript and TypeScript mental model, while Vercel monetizes the hosting and execution layer that sits behind those built in endpoints.
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Going forward, the same pattern is expanding from simple API routes into a broader backend for frontend model inside Next.js. As more logic moves into route handlers, server components, and edge functions, the winning platforms will be the ones that let teams keep shipping from one repo before complexity forces them to break services apart.