What interface name does it give the root object?
It defaults to RootObject or a configurable name, and generates semantic sub-interface names for nested objects.
Converters
Generate readable TypeScript interfaces from JSON.
Add an input and run this tool to see the output.
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JSON to TypeScript Developer Guide
100% Client-Side & PrivateTurn JSON examples into inferred TypeScript interfaces for API fixtures, configuration, and frontend development.
Key capabilities
- Infers strict TypeScript interfaces from arbitrary JSON sample objects
- Recursively handles nested objects, arrays of objects, and union types
- Generates clean, readable exported interface declarations
- Detects optional and nullable fields across object collections
Common use cases
- Rapidly typing API responses when integrating third-party REST or GraphQL services
- Creating frontend type contracts from raw JSON fixtures or Postman payloads
- Speeding up migration from plain JavaScript to strict TypeScript
How to use JSON to TypeScript
- Paste your sample JSON object or array into the input editor
- Review the inferred TypeScript interfaces generated on the right
- Copy the interfaces directly into your `.ts` or `.tsx` file