JSON to TypeScript conversion
Convert JSON to TypeScript interfaces in one paste
Typing API responses by hand wastes time and drifts from the real shape. The JSON to TypeScript tool generates interfaces from a JSON sample instantly, locally.
The fast workflow
Follow the same short workflow every time so the result is predictable.
Paste the JSON
Use a representative API response or config sample.
Choose the options
Pick naming style and optional-field handling.
Generate
Interfaces and types are produced instantly.
Copy into your code
Paste the output into a types file and refine.
What the generated types look like
Each object becomes an interface with typed properties; arrays become arrays of the item type; and nested objects become their own interfaces, so the output stays readable.
For deeply nested payloads, validate the shape with the JSON formatter first so the generated types match reality.
Common problems
- Hand-typing interfaces that go stale
- Using any types that hide real response shapes
- Generating from a one-off sample that is not representative
Best practices
- Generate from a realistic sample, then refine
- Review null and optional fields before shipping
- Regenerate whenever the API response changes
Frequently asked questions
Does the converter handle nested objects?
Yes. Nested objects become their own interfaces and are referenced from the parent type.
How are arrays converted?
Arrays become typed arrays such as string[] or User[], using the item type inferred from the sample.
Can I use the output for API clients?
Yes, as a starting point. Add nullability and refine names before using it in production code.
Is my JSON uploaded?
No. Conversion runs locally in your browser.
Your data stays local
Everything runs in your browser. Files and values are never uploaded or stored.
Open JSON to TypeScript