TOOLGENIEJSON to TypeScript — Convert JSON to an Interface
Convert JSON to a TypeScript interface in your browser. Nested objects become named interfaces, arrays of objects merge optional fields, and nothing is uploaded. If the JSON is invalid, validate it first.
TypeScript output
How to Convert JSON to TypeScript
- Start from a valid sample on JSON examples or paste an API response.
- Set the root interface name, such as User or ApiResponse.
- Copy the generated interfaces into your project.
About This JSON to TypeScript Converter
This tool infers TypeScript interfaces from a JSON value. It is not a full editor. Clean the payload in the JSON editor or formatter first if the types look wrong because of invalid input.
Frequently Asked Questions (FAQ)
How do I convert JSON to a TypeScript interface?
Paste JSON, name the root type, and copy the generated export interface blocks.
Are missing fields marked optional?
Yes. Keys missing from some objects in an array become optional properties.
Can I name the root interface?
Yes. Change the root interface name before you copy the output.
What if my JSON is invalid?
Fix it in the JSON validator and convert again.
Does this upload my JSON?
No. Inference runs in your browser only.
Tips for Better Generated Types
- Use a representative sample so optional fields are detected.
- Rename generated nested interfaces if the key names are too generic.
- Review unions from mixed arrays before you commit the types.