Turn a sample JSON object into TypeScript, Go, Python or Rust types, and generate arrays of 5 to 50 mock records from the same shape.
Paste a sample JSON object and this tool writes matching type definitions in four languages: a TypeScript interface, a Go struct with json tags, a Python TypedDict, or a Rust struct with serde derives. Field types are inferred from the sample values, so numbers become integers or floats, true and false become booleans, and text becomes strings. Switch languages with one click and copy the code.
The same sample also drives a mock data generator. Pick 5, 10, 25 or 50 items and the tool creates an array of records with the same keys, filling ID fields with sequential numbers, name and email fields with realistic placeholder values, numbers with random values and booleans with alternating values. It is useful for stubbing API responses, seeding tests or sketching a front end before the back end exists. Everything runs in your browser.
The TypeScript output describes nested objects and arrays inline. The Go, Python and Rust output maps top-level fields only, so nested structures may need manual edits.
No. It generates language type definitions and mock data, not a JSON Schema file.