JSON to TypeScript Converter

JSON to TypeScript converter generates TypeScript interfaces/types from JSON data—essential when working with APIs that don't provide type definitions. Paste JSON response from any API and get properly typed interfaces instantly. The tool detects array types, optional fields (if multiple examples show field sometimes missing), nested objects, union types (string | number), and generates proper TypeScript naming conventions. Use cases: quickly type API responses for fetch() calls, create types for JSON config files, generate interfaces for localStorage data structures, and scaffold types when migrating JavaScript to TypeScript. The generated types are copy-paste ready—just add to your .d.ts or component files.

Tips & Best Practices

**Common pitfalls**: Single JSON example can't detect optional fields—tool assumes all present fields are required. Feed multiple JSON examples if available to detect optionals. Generated names may need manual adjustment (Interface1, Interface2)—rename to meaningful names. Arrays with mixed types (numbers and strings) generate union types which TypeScript may struggle with—consider fixing data structure. For complex APIs with many endpoints, use openapi-typescript or quicktype CLI for batch generation. Remember: generated types are starting point, not final types—add JSDoc comments, refine union types, and add validation logic separately.