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JSON to TypeScript

Generate TypeScript interface/type from JSON.

Input JSON
TypeScript Output

About This Tool

This JSON to TypeScript tool helps developers generate TypeScript type definitions from any JSON data. It recognizes object structures, array types, and optional fields, producing clean interface or type outputs for API modeling and type safety. Everything runs locally in your browser for speed and privacy.

Features

  • ⚡ One-click Output: Paste JSON to generate TypeScript types instantly
  • 🧠 Smart Inference: Detect objects, arrays, and optional fields
  • 🧩 Flexible Modes: Choose between interface or type output
  • 🧾 Clean Structure: Auto-formatted nested structures for readability
  • 📋 Easy Copy: Copy generated definitions with one click
  • 🛡️ Privacy First: Fully local processing, no uploads

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