JSON to TypeScript Interface Generator
Processed in your browser
Infer TypeScript interfaces, type aliases, and optional fields from sample JSON data.
Generated TypeScript Interfaces
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Direct In-Browser Handoff
Structured Data Transformation Pipeline
Chain this tool with complementary private browser utilities for a complete zero-server workflow:
Helpful Examples
User Object JSON
Convert user record to interface
{"id": 1, "username": "alice", "isActive": true}How to Use the JSON to TypeScript Interface Generator
Paste raw JSON API payloads to automatically generate typed TypeScript interfaces. Correctly infers nested objects, arrays, union types, numbers, booleans, and optional fields.
Privacy & Data Processing Notice
No user data leaves your browser. Computation is executed entirely on your device. We do not store, view, or transmit your inputs over our network. Your computation remains on your personal machine.
Frequently Asked Questions
How are nested objects handled?
Each nested object structure is extracted into its own named TypeScript interface.
How are array types inferred?
The generator analyzes items inside the array to output typed array declarations like `string[]` or `ItemModel[]`.
Related Utilities
Frequently paired browser tools in Structured Data Tools