Writing apps with Prisma Composer

A Prisma App is a tree of Modules composed in TypeScript. The leaves are services (compute()) and resources (postgres()); the root module wires them together by their typed ports. Your code receives everything from exactly one place — the service node:

• service.load() — dependencies (typed RPC clients, database bindings)
• service.input() — the service's whole input, one schema-validated typed object; credentials in it are redacting SecretString boxes
• service.port() — the reserved port to bind (default 3000), typed; never process.env

The framework never bundles or transforms your code. You build your app with whatever bundler you like (bun build, next build); prisma-composer deploy assembles the built output and provisions it on Prisma Cloud (Compute + Prisma Postgres).

Two things make building here fast and hard to get wrong — lean on both: