JSON to TypeScript Generator
Convert JSON samples into TypeScript interfaces and types.
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Generate TypeScript types from JSON samples
JSON to TypeScript Generator turns pasted API responses, config files, and event payloads into draft interfaces and types. It infers optional fields, null values, arrays, and nested objects directly in the browser.
Useful For
- Draft API response interfaces
- Document config file shapes
- Inspect optional fields and unions from arrays
Good To Know
Pasted JSON stays in the browser and is not included in shared URLs.
Developer Check
Generated code, regexes, meta tags, and config snippets should be treated as drafts and tested again in your runtime, security policy, and deployment environment.
How It Works
Inputs are calculated or converted in the browser whenever possible. Compare important results with the original source before using them. Reviewed on Jul 2, 2026.
JSON to TypeScript checks
Sample JSON
- Use a sample close to the real API response
- Include nulls, empty arrays, and optional fields when relevant
Type shape
- Choose interface or type based on project style
- Review names for nested objects and array types
Before use
- Compile the generated type with real API code
- Pair with a schema library such as Zod when runtime validation matters
Yes. Paste a JSON object or array and it generates a draft TypeScript type from the structure.
It follows nested objects and arrays, but complex unions and optional fields should still be reviewed manually.
Type generation runs in the browser by default, and pasted JSON is not stored on the server.