Is output as strict as zod?

No—validate at runtime with zod, ajv, or your API client; use this for fast scaffolding.

Does parsing hit a server?

JSON is parsed entirely in your browser.

How are nullable fields handled?

JSON null becomes the TypeScript null literal in the inferred shape; absent keys are not automatically marked optional.

Can I rename the root type?

Yes—set the root type name field to match your domain model before copying.

JSON to TypeScript Types — Quick type export

JSON

Root type name

TypeScript

export type ApiResponse = {
  id: number;
  name: string;
  tags: string[];
};

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Inference limits

Generated types are a starting point: empty arrays become unknown[], mixed arrays collapse to unknown[], and optional fields are not inferred from absent keys.

Privacy

Editing and conversion run in your browser for these workflows—nothing is uploaded to our servers for the core tool actions. Clear sensitive data on shared machines when you are done.

JSON to TypeScript

Inference limits

Privacy

Frequently asked questions

JSON to TypeScript

Inference limits

Privacy

Frequently asked questions