JSON to TypeScript
Generate TypeScript interfaces from JSON
π 100% client-side β your data never leaves this pageAbout this tool
Paste any JSON object and instantly get TypeScript interface or type alias definitions. Supports nested objects with recursive type generation, arrays, primitive types, and null values. Choose between interface and type keyword. Useful for quickly typing API responses.
Frequently Asked Questions
What is the difference between interface and type in TypeScript?
Both can describe object shapes, but interfaces are extendable and mergeable while types are more flexible and can represent unions and intersections. For plain object shapes from JSON, both work equally well.
Does it handle nested objects?
Yes. Nested objects are recursively converted into separate named interfaces, keeping your type definitions clean and reusable.
What happens with null values?
null values are typed as null. In practice you may want to change these to T | null or use optional fields depending on your API contract.