JSON Formatter
Format, minify, and validate JSON text in your browser.
JSON to TypeScript types
Infer TypeScript types from JSON samples, including nested objects, optional properties, arrays, unions and null.
Types are inferred from this sample. Missing object properties become optional; empty arrays use unknown[].
Updates as you type or change an option
About this tool
Infer TypeScript types from JSON samples, including nested objects, optional properties, arrays, unions and null.
How to use
Paste a representative JSON sample and choose a type name. Copy the generated export or download a .ts file. Array samples are combined: properties missing from some objects become optional and different value types form unions.
Empty arrays use unknown[] and empty objects use { [key: string]: unknown }. A sample cannot describe values it does not contain, so review the type against your API contract. Duplicate keys are rejected. Limits: 2 MiB, 30,000 values and 80 nested levels.
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