JSON to TypeScript

Derive reusable TypeScript types from a sample JSON value. Inspect array unions, nested records and optional keys before using them in your project.

01 Input

YOUR INPUT

02 Output

LOCAL RESULT

QUICK GUIDE / 01

How to use

Select Load example to restore the sample, or replace the labeled inputs with your own values.
Review the options and select Run tool. No input is sent to a server.
The result describes the observed sample, not every possible value of your API.
Inspect the result, then copy or download it. Clear removes visible inputs and output.

A worked example

Load example restores these values.

Sample JSON:
{"name":"Ada","active":true,"scores":[1,2]}

Root type name:
Root

Expected result

export type Root = {
  name: string;
  active: boolean;
  scores: Array<number>;
};

Scope & limitations

Keys absent from some array records become optional. Dates stay strings. Recursive data and schema inference from multiple files are not supported. JSON numbers use JavaScript binary64 precision; keep large exact identifiers as strings. Numeric overflow is rejected.

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JSON to TypeScript

01 Input

02 Output

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