JSON to TypeScript Converter
RunDev
Paste JSON, instantly generate TypeScript interfaces. Handles nested objects, arrays, and optional fields.Updated 2026-03-16
How to Use JSON to TypeScript Converter
- Paste your code or data into the input
- Click Process or press Ctrl+Enter
- Review output with syntax highlighting
- Check validation messages for issues
Frequently Asked Questions
How does JSON to TypeScript conversion work?
The tool recursively analyzes your JSON structure, infers TypeScript types for each property, creates named interfaces for nested objects, and correctly types arrays based on their contents.
Does it handle nested objects and arrays?
Yes! Nested objects are extracted into separate named interfaces. Arrays are typed by analyzing their element types. Mixed-type arrays produce union types.
Is my JSON data safe?
Absolutely. All processing happens locally in your browser using JavaScript. No data is transmitted to any server.