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JSON to TypeScript

Paste a JSON payload and instantly get TypeScript interfaces (or type aliases) describing its shape. Optionally mark all properties as optional or readonly. Useful for API mock data, fixtures, or quick type stubs.

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How to use JSON to TypeScript

  1. Paste valid JSON.
  2. Set the root interface name.
  3. Pick interface or type alias, and optional flags.
  4. Copy the generated TypeScript.

JSON to TypeScript అంటే ఏమిటి?

The tool walks the JSON tree, infers types (string / number / boolean / null / array / object), recursively generates a named interface for each object, and assembles them into a clean TypeScript file. Mixed-type arrays become union arrays (e.g., (string | number)[]).

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FAQ

What about discriminated unions?
Not auto-detected. The tool generates structural types from a single sample. Hand-merge unions if you have multiple samples.
Is this useful for typing API responses?
Absolutely—paste JSON from an API to generate TypeScript interfaces for mocks, documentation, or frontend code.
Does it support deeply nested JSON structures?
Yes, it handles nested objects and arrays to create comprehensive TypeScript type definitions.

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Author

MW
Marcus Webb"The DevTool Craftsman"

Full-Stack Developer & Tools Architect

Marcus has been writing code since the dial-up era. He has contributed to open-source developer tools, built CI/CD pipelines for startups, and debugged production incidents at 3 AM more times than he would like to admit. His philosophy is that the best developer tool is the one that gets out of your way, and he writes about practical tooling that helps teams ship faster with fewer headaches.

📖 JSON to TypeScript on Wikipedia·Developer Tools on Wikipedia·JSON to TypeScript on Britannica

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