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JSON to TypeScript Converter — Free, In-Browser

Free JSON to TypeScript interface generator. Nested objects → nested interfaces, mixed arrays → union types. Browser-based.

JSON to TypeScript Interface Converter

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About this tool

Quick types from any API response

Paste a sample API response, get a clean export interface tree. Useful first draft before hand-tightening (marking optionals, narrowing string unions to literals, swapping unknown for the real type).

How to use the JSON to TypeScript Interface Converter

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the JSON to TypeScript Interface Converter above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the JSON to TypeScript Interface Converter.

Is the JSON to TypeScript Interface Converter free to use?

Yes. The JSON to TypeScript Interface Converteron 7BusyBoss is completely free — no signup, no paywall, no usage cap.

Do I need to sign up to use the JSON to TypeScript Interface Converter?

No. The JSON to TypeScript Interface Converterworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the JSON to TypeScript Interface Converter work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the JSON to TypeScript Interface Converter?

Yes. The JSON to TypeScript Interface Converterruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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