Does this support nested objects?

Yes, the generator will deeply traverse your JSON and create separate, cleanly linked TypeScript interfaces for all nested objects and arrays.

What happens if my JSON is invalid?

The tool automatically validates your JSON as you type and will highlight any syntax errors before attempting to generate types.

ASAPUtils

JSON to TypeScript

Instantly convert JSON objects into robust TypeScript interfaces using the Developer Transformation Engine.

Paste any valid JSON payload, and this tool will immediately generate exact TypeScript interfaces (interface or type) for it.

This is incredibly useful when consuming a new API or converting a mock JSON payload into a strictly-typed model for your Next.js, React, or Angular project.

Powered by the Developer Transformation Engine & quicktype.

Free online JSON formatter and beautifier. Instantly pretty print, validate, and format JSON with 2 or 4-space indentation. Runs 100% in your browser.

JSON Tree View Online — Interactive JSON Explorer

Free online JSON tree viewer. Render complex JSON as a collapsible, interactive tree structure. Explore nested objects and arrays visually.

JSON to TypeScript

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