Utilumo
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JSON to TypeScript

Generate TypeScript interfaces from JSON objects and arrays locally, including nested objects, optional fields, and null unions.

JSON to TypeScript workspace

Generate interfaces locally as you edit. Copy actions stay below the result.

TypeScript generation settings

Interfaces update live from the JSON input.

TypeScript output

TypeScript updated live

Interfaces are generated locally as you edit.

Output

1 interfaces5 linesUser
Files are processed in your browser. No data is uploaded.

Questions

Does JSON to TypeScript run locally?

Yes. The JSON parser and interface generator run in your browser.

Does it support nested objects?

Yes. Nested objects are emitted as separate interfaces with names based on the root interface and property name.

Does it merge arrays with different fields?

Yes. Object arrays are merged into one interface, missing keys become optional, and null values are included in the union.

Does Utilumo upload my input?

No. This tool is designed for local browser processing and does not send your input to a server.

Do I need an account?

No. Utilumo tools are built to work without accounts or sign-in.