How does the JSON to TypeScript conversion work?

The tool parses your JSON, inspects every key and value type, and recursively generates TypeScript interfaces for nested objects and arrays.

Does it handle nested objects?

Yes. Each nested object gets its own named interface, and array element types are inferred from the first element.

Null values are typed as unknown since the actual type cannot be determined from null alone.

No. All conversion happens entirely in your browser. Nothing is transmitted to any server.

Paste JSON to generate TypeScript interfaces instantly.

JSON Input

Step 1

Paste or type your JSON into the input textarea.

Step 2

TypeScript interfaces are generated automatically.

Step 3

Review the generated interfaces in the output panel.

Step 4

Click Copy to copy the TypeScript code to your clipboard.

Automatic TypeScript interface generation from JSON.

Handles nested objects with separate named interfaces.

Array type inference from element values.

Completely client-side — no data leaves your browser.

: The tool parses your JSON, inspects every key and value type, and recursively generates TypeScript interfaces for nested objects and arrays.
: Yes. Each nested object gets its own named interface, and array element types are inferred from the first element.
: Null values are typed as unknown since the actual type cannot be determined from null alone.
: No. All conversion happens entirely in your browser. Nothing is transmitted to any server.