How to Use the JSON to TypeScript Converter

This tool instantly converts any JSON structure into clean, well-typed TypeScript interfaces. It supports deeply nested objects, arrays, union types, and optional field detection.

• Paste JSON — enter or paste your JSON data in the left panel. The converter processes it in real time.
• Nested objects — child objects are extracted into separate named interfaces with PascalCase names.
• Optional fields — paste a JSON array of objects and the tool detects which fields are optional by comparing all items.
• Customize output — toggle export, readonly, optional, choose between interface and type aliases, and pick your preferred array syntax.
• Edge cases — handles null, mixed-type arrays, empty objects, and deeply nested structures gracefully.

Built for speed and accuracy. No data leaves your browser — all conversion happens locally.