Convert JSON to TypeScript Interfaces - Free Developer Tool Online

Generate strongly-typed TypeScript interfaces from any JSON payload automatically.

Runs entirely in your browser

Input JSON

Output

Formatted output appears here

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How to use Convert JSON to TypeScript Interfaces - Free Developer Tool

1Paste your JSON API response.
2Click Generate TypeScript.
3Copy your generated TypeScript interface definitions.

Privacy & security

Client-side processing.

No code or API payloads sent to servers.

Frequently asked questions

Does it support optional properties and nested objects?

Yes, nested JSON structures are automatically broken down into individual sub-interfaces.

Generating TypeScript Interfaces from Raw JSON API Payloads

Writing TypeScript types manually for complex REST or GraphQL API responses is tedious. Auto-generating interfaces from sample JSON speeds up frontend development and eliminates runtime type mismatches.

Common use cases

Frontend React & Next.js API Integration

Paste your API response to get instant type-safe TypeScript interfaces for your React state and hooks.

Tips for best results

Use real sample API data with populated fields to ensure type inference detects nullables and array types accurately.

Does it handle array of objects?

Yes, array elements are analyzed to infer union types and property fields.