Paste any JSON object or array and get clean, ready-to-use TypeScript interfaces. Nested objects become named sub-interfaces, array element types are inferred (including unions for mixed arrays), and everything is generated instantly in your browser — your data never leaves your device.
Types are inferred from a single JSON sample, so the result reflects only the values you paste. Nested objects are lifted into their own named interfaces; arrays of objects merge all seen keys and mark differing element types as a union. Empty arrays become any[] and JSON null becomes null. Review the output before shipping — real-world data may have optional fields a single sample can't reveal.