How do I generate TypeScript interfaces from JSON?

Paste your JSON object into the input field. The tool parses the JSON and automatically generates a TypeScript interface with the correct types — string, number, boolean, nested objects, and arrays are all detected automatically.

What types are inferred from JSON values?

The generator infers: string, number, boolean, null, nested object types (shown inline), and array types. {"name":"Alice","age":30} generates {name: string; age: number}.

Can I customize the interface name?

Yes — the 'Interface name' field lets you set any name for the root interface (default: 'Root'). The generated interface is exported so you can paste it directly into your TypeScript project.

Does the tool handle nested objects and arrays?

Yes — nested objects are represented as inline type definitions. Arrays use the detected item type with square bracket notation (e.g. string[] or number[]). Deeply nested structures are fully supported.

Is the JSON to TypeScript generator free and private?

Yes — completely free, no account required. All processing runs in your browser with no server involved, so your JSON data stays private.

JSON → TS

JSON to TypeScript

Generate TypeScript interfaces from any JSON object. Paste your JSON and get a typed interface instantly.

Your files are processed locally and never uploaded to our servers.

Interface name

JSON Input

How it works

1
Type or paste input
Paste your value into the input field. No file needed — works directly in your browser.
2
Get instant results
The result appears in real time as you type. No server, no upload.
3
Copy the output
Click the copy button to copy the result to your clipboard instantly.

Frequently Asked Questions

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