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JSON to TypeScript Converter

Generate TypeScript interfaces, Zod schemas, Go structs, Python dataclasses or Rust structs from JSON.

To generate TypeScript from JSON, paste a sample payload above and an interface is inferred from its shape, including nested objects and arrays. The same tool also emits Zod schemas, Go structs, Python dataclasses, Rust serde structs and Kotlin data classes from the same input.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How are optional fields handled?

Types are inferred from a single sample, so every key present becomes required. If a field can be absent, mark it optional yourself after generating — one example cannot tell the difference between "missing" and "not in this record".

What happens with arrays of mixed types?

The first element determines the element type. For genuinely heterogeneous arrays you will want a union type, which needs to be written by hand.

How to use the json to typescript converter

  1. 1Enter or paste your json.
  2. 2Enter or paste your root type name.
  3. 3Choose the generate.
  4. 4The result appears immediately — copy or download it.

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Put the working json to typescript converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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