Shared Contract

One source of truth.
Every layer stays aligned.

From the Echo Map, Studio generates a single typed contract that your database, API, and frontend all import from. The same types, generated once, enforced everywhere. Drift between layers becomes structurally impossible.

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Why type drift causes real production bugs

Every layer of a web application has its own type definitions. When they diverge — and without enforcement, they always do — bugs appear in production, not in development.

Database
user_id renamed to id in a migration
→ API queries break at runtime, not at compile time
API
endpoint returns snake_case but frontend expects camelCase
→ UI shows undefined, bug traced hours later
Frontend
component expects email as string, API returns null
→ TypeError crashes the entire page

Hover to see the connection

The same User type exists in your database schema, your API contract, and your frontend component. Hover any highlighted field below to see it light up across all three layers simultaneously.

Database SchemaPrisma
model User {
id String @id
email String @unique
name String?
role UserRole
createdAt DateTime
projects Project[]
}
API ContractTypeScript
interface User {
id: string
email: string
name: string | null
role: UserRole
createdAt: Date
projects: Project[]
}
Frontend PropsReact
interface UserCardProps {
id: string
email: string
name: string | null
role: UserRole
createdAt: Date
}
id
email
name
role
createdAt
— hover to highlight across all layers

What the contract enforces

TypeScript throughout
Every type in the contract is TypeScript. The database schema, API request/response shapes, and frontend prop interfaces are all generated as typed TypeScript interfaces that import from the same shared package.
Zod runtime validation
Runtime validation schemas are generated alongside the TypeScript types. API handlers validate incoming requests against the Zod schema before touching the database — bad data is rejected at the boundary, not discovered later.
Naming conventions enforced
camelCase vs snake_case conflicts cannot occur because the contract defines the canonical form. Transformations between the database and API layer are generated, not invented per-developer.
State management conventions
The contract specifies how state is structured in the frontend. Zustand stores, React Query keys, and Redux slices are generated from the same type definitions as your API responses.

One contract. Zero drift.

Download Studio free and see the shared contract in action on your first project.

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