JSON to TypeScript.

Infer TypeScript interfaces from JSON, with optional Zod schemas. Interface or type-alias output.

Client-onlyTS · Zod

readonly props

JSON in117 chars

TypeScript13 lines

export interface RootAddress {
  city: string;
  zip: string;
}

interface Root {
  id: number;
  name: string;
  tags: string[];
  address: RootAddress;
  active: boolean;
  score: number;
}

🔒 Privacy — runs 100% locally

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How to use.

Paste JSON — interfaces infer live.
Toggle interface/type, readonly, or switch to Zod for runtime schemas.
Copy into your codebase (export keyword included).

Related tools.

Formatters

JSON formatter

Pretty-print, minify and validate JSON with exact error pointers. Pasted text never leaves this tab.

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Converters

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Formatters

HTML / CSS formatter

Tidy indented markup or minify it for shipping. Handles inline CSS and void elements.

HTML · CSS

FAQ.

How are optional fields handled?

Conservatively — every observed key is required. Delete or add ? where your API is actually optional.

Empty arrays?

They infer as unknown[] since there's nothing to learn from — fill in the element type manually.