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JSON to TypeScript Converter

Paste any JSON and get production-ready TypeScript interfaces in seconds. Handles nested objects, arrays, optional fields, and union types. Configure export style, indentation, and readonly properties.

100% Free · No limits · Client-side

JSON to TypeScript
Converter

Paste any JSON and get production-ready TypeScript interfaces instantly. Smart type inference, nested object generation, date detection, and configurable output. Nothing leaves your browser.

Quick start:
Root Name
Declaration
Indent
Options
JSON Input
TypeScript Output
TypeScript interfaces will appear here
Smart Type Inference
Automatically detects primitives, arrays, nested objects, ISO dates, nullable fields, and generates proper union types for heterogeneous arrays.
Named Interfaces
Nested objects become separate, named interfaces with PascalCase naming. Array items are singularized. No messy inline types.
Production Ready
Output includes proper export keywords, configurable indentation, readonly modifiers, and optional markers. Paste directly into your codebase.

How to Convert JSON to TypeScript

Generate production-ready TypeScript interfaces from JSON using The IT Hustle's free converter.

  1. 1
    Paste your JSONEnter or paste a JSON object or array into the left panel. The tool validates it in real-time.
  2. 2
    Configure optionsSet the root interface name, choose between interface and type aliases, toggle optional fields, readonly, and export keywords.
  3. 3
    Review the outputThe right panel shows syntax-highlighted TypeScript interfaces with separate types for nested objects.
  4. 4
    Copy to your projectClick Copy to copy the TypeScript code, ready to paste directly into your .ts file.

Frequently Asked Questions

Yes. Nested objects are extracted into separate named interfaces. For example, a user object with an address field generates both a User interface and an Address interface.

The converter analyzes all items in an array to determine the type. Homogeneous arrays become string[] or number[]. Mixed arrays become union types. Object arrays generate a shared interface from all items.

Yes. The generated interfaces use proper TypeScript conventions: PascalCase names, optional fields marked with ?, and clean indentation. You can paste the output directly into your project.

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