JSON to TypeScript
Free online tool · runs in your browser
Generate TypeScript types from JSON.
Quick tutorial
- 1Paste a representative JSON sample.
- 2Set the root type name if needed.
- 3Click Convert and copy the generated types.
Free online json to typescript
Convert JSON to TypeScript types in the browser. Paste a representative JSON sample and generate nested object and array types you can copy into a project. This JSON-to-interface helper is for quick scaffolding — not a replacement for OpenAPI or schema codegen — and never uploads your payload.
How to use JSON to TypeScript
- Paste a representative JSON sample.
- Set the root type name if needed.
- Click Convert and copy the generated types.
Limitations
- Inferred unions from heterogeneous arrays may be approximate.
- Not a substitute for schema-driven codegen.
Example
Input
{"id":1,"active":true}Output
export type Root = {
id: number;
active: boolean;
};FAQ
Frequently Asked Questions
Can it generate TypeScript interfaces from nested JSON?
Yes. Nested objects and arrays are converted recursively into TypeScript type aliases.
Does it support optional fields?
Fields present in the sample are required in the generated type. Missing keys in some objects are not inferred as optional.
Can it handle nested objects?
Yes, nested structures are converted recursively.
Is JSON to TypeScript free to use?
Yes. JSON to TypeScript on ShadowReference is free, with no account, no watermarks, and no server-side processing.
Does this tool send my data to a server?
No. All processing happens locally in your browser. Your input never leaves your device.