devcrate / JSON / JSON to TypeScript Converter
JSON

JSON to TypeScript, instantly.

Paste any JSON object or API response and get back a typed interface — nested objects become their own named types, arrays are typed from their first element, and null fields are marked optional.

runs entirely in your browser — nothing is uploaded
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How to use the json to typescript converter

  1. Paste a JSON object, or click "Load sample" to see it in action.
  2. Choose whether you want interface or type syntax, and set a name for the root type.
  3. Click Convert. Nested objects automatically become their own named interfaces.
  4. Click Copy and paste the result straight into your .ts file.

Frequently asked questions about the JSON to TypeScript Converter

Is my data uploaded anywhere when I use the JSON to TypeScript Converter?
No. The JSON to TypeScript Converter runs entirely in your browser using JavaScript — nothing you type, paste, or select is sent to any server. You can confirm this yourself by opening your browser's network tab while using it.
Is the JSON to TypeScript Converter really free, and do I need an account?
Yes — the JSON to TypeScript Converter is completely free, with no account, sign-up, or usage limit.
Does it work on mobile and in any browser?
The JSON to TypeScript Converter works in any modern browser — Chrome, Firefox, Safari, or Edge — on desktop or mobile, since it's built with standard HTML, CSS, and JavaScript with no special requirements.

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