JSON to TypeScript Converter

Convert JSON to TypeScript interfaces, type aliases or a Zod schema. Handles nested objects, arrays, unions, null and optional keys, ready to paste into your project.

  • Free, no sign-up
  • Runs in your browser
  • Your data stays private

How to use the JSON to TypeScript Converter

  1. Paste a JSON sample, such as an API response.
  2. Choose interface, type or Zod and the root name.
  3. Copy the generated code.

Why use this JSON to TypeScript Converter

  • Three outputsTypeScript interfaces, type aliases or a Zod schema with an inferred type.
  • Nested typesNested objects become named interfaces, with array items named from their key.
  • Optional propertiesKeys missing from some array items are marked optional.
  • Optionsreadonly properties, export, and whether null stays in the type.

Frequently asked questions

How do I generate TypeScript types from an API response?

Paste the JSON response and copy the interfaces. Name the root type in the options.

How are optional fields detected?

If a key is missing in some objects of the same array, it is marked with a question mark.

Why is a null field typed as null?

A single sample cannot show the real type. Edit it to something like string | null.

Related tools

More Developer Tools

User Reviews

–
No ratings yet
Write a review
Your rating *

Your email is never published. Reviews are moderated, and links aren't allowed.

What users are saying

No reviews yet

Be the first to share your experience with this tool — your feedback helps others.