JSON to TypeScript

Paste JSON and get clean TypeScript interfaces — nested objects become their own named types, arrays become T[], and null or missing fields become optional. Nothing is uploaded.

Your JSON

Root type name

Output style

Options

Add export keyword Make fields readonly End fields with semicolons

TypeScript

Everything runs in your browser. No upload, no sign-up.

How it works

STEP 1

Paste your JSON

Drop in an API response or any JSON object. It is parsed right in your browser — nothing leaves your device.

STEP 2

Set the options

Name the root type and choose interfaces or type aliases. Nested objects automatically become their own named TypeScript types.

STEP 3

Copy the result

Copy the generated TypeScript with one click and paste it straight into your project.