JSONTech

JSON to TypeScript

Generate TypeScript interfaces from JSON data with automatic type inference for nested structures.

JSON Input

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TypeScript Output

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Frequently Asked Questions

Paste a JSON object and the tool analyzes the structure, data types, and nesting to generate TypeScript interfaces. Arrays are typed based on their contents, and nested objects get their own named interfaces.

The tool generates interfaces based on the sample data provided. If a field is present, it's marked as required. For optional fields, you'll need to add the ? modifier manually after reviewing the generated types.

Absolutely — that's one of the most popular uses. Copy a JSON API response, paste it in, and get TypeScript interfaces ready to use in your frontend code. This saves significant time when working with REST APIs.

Strings become string, numbers become number, booleans become boolean, null becomes null, arrays become typed arrays (e.g., string[]), and objects become named interfaces with all their properties.