JSON to TypeScript

Paste JSON → Get TypeScript interfaces with proper types for nested objects, arrays, and nullable fields.

JSON Input1 lines
TypeScript Output
TypeScript interfaces will appear here...

How It Works

Paste any JSON object or API response. The tool analyzes the structure, infers types for every field, and generates clean TypeScript interfaces. Nested objects become separate interfaces. Arrays are typed based on their first element. Null values become union types.

Use Cases

API Integration — Paste a REST API response, get types for your fetch calls.

Database Models — Convert Prisma/MongoDB documents to TypeScript types.

Config Files — Type your JSON config files for better IDE support.