JSON to TypeScript
Infer a readable TypeScript type from sample JSON without uploading the data.
How to Use JSON to TypeScript
- Paste a representative JSON sample into the input editor.
- Review the result and its visible context before using it.
- Copy, download, or save only the output you need.
Purpose & Processing Boundary
Infer clean, idiomatic TypeScript interfaces and type definitions from representative JSON samples without uploading sensitive payload data.
Type inference is heuristic. Review optional properties, union types, and nullable fields before incorporating generated code into production.
Frequently Asked Questions
How does the generator handle optional fields in arrays?
The generator inspects all array items. If an object property is missing in certain array elements, you can easily mark the inferred property with the optional ? modifier.
Does this tool support deeply nested JSON structures?
Yes. Deeply nested JSON objects are automatically decomposed into distinct, modular TypeScript interfaces with clean PascalCase naming conventions.
Is my sample JSON sent over the network?
No. All TypeScript type inference runs client-side in your local browser runtime, keeping your data strictly confidential.