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JSON to TypeScript & Types

Paste a JSON sample and generate strongly-typed definitions — TypeScript interfaces, Go structs, Python TypedDicts, or Zod schemas. Nested objects become named types and arrays are merged, with missing keys marked optional. It even accepts Python dict literals.

How to use JSON to TypeScript & Types

  1. Paste a JSON object or array.
  2. Pick your target: TypeScript, Go, Python, or Zod.
  3. Copy the generated types into your project.

Frequently asked questions

How are optional fields decided?
When a key is missing from some objects in an array (or is null), it is marked optional so the generated type matches every sample row.
Is my JSON uploaded?
No. Inference runs entirely in your browser; nothing is sent to a server.

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