JSON to TypeScript

What it infers

• Each nested object becomes its own named type, named after its key in PascalCase (shipping_address becomes ShippingAddress).
• Arrays of objects are merged into one item type. Keys that are missing in some items get ?; differing value types become a union.
• null values become null in a union, or unknown if a key is only ever null.
• Keys that are not valid identifiers are quoted.

Limits

Types are inferred from one sample, so they describe what you pasted, not every response the API can return. For a contract you can rely on, generate types from an OpenAPI or JSON Schema document instead.

FAQ

Is my JSON sent to a server?

No. The JSON is parsed and the types are generated in your browser.

Why is a field typed as unknown[]?

The sample had an empty array, so there was nothing to infer the item type from. Paste a sample with at least one item.