Next.js 14+ with App Router uses Server Components and Route Handlers that return JSON data. Without proper TypeScript types, you lose autocomplete, refactoring safety, and compile-time error detection. This tool generates interfaces directly from your API response data.
Typing API Route Handlers
Next.js Route Handlers (app/api/*/route.ts) return NextResponse.json(data). Paste the data shape here to generate the response type, then use it with generic NextResponse<T> for end-to-end type safety.
Server Component Data Types
Server Components fetch data directly. The fetched JSON needs types for the rendering logic. Generate interfaces from a sample API response, then use them as the return type of your data fetching functions.
Prisma & Drizzle ORM Types
If your Next.js app uses Prisma or Drizzle, the database query results are JSON-serializable objects. While these ORMs provide their own types, you often need to create DTOs (Data Transfer Objects) that match the serialized JSON shape sent to the client.
Privacy & Security
All processing happens in your browser's local memory. Your data — whether it's API responses containing authentication tokens, Kubernetes cluster configurations, or database exports with PII — never touches any external server. JSON Studio is 100% client-side by design.