JSON to TypeScript
Generate TypeScript interfaces from JSON data instantly. Handles nested objects, arrays, and optional properties.
Frequently Asked Questions
How does JSON to TypeScript conversion work?
The tool parses your JSON and recursively analyses the shape of every value — objects become interfaces, arrays are typed by their elements, and primitives map to string, number, or boolean.
Are nested objects converted into separate interfaces?
Yes. Each nested object gets its own named interface derived from its parent key, keeping your types clean and reusable.
What does the 'optional properties' option do?
When enabled, every property is marked with a ? modifier (optional). This is useful when the JSON represents a partial response or when some fields may be absent in other payloads.
Can I customise the root interface name?
Absolutely — type any name in the "Root interface name" field and it will be used as the top-level interface name.
Does this handle arrays of objects?
Yes. If the top-level JSON is an array, the tool generates an interface from the first element and exports both the interface and a typed array alias.