This free online developer tool converts a JSON document into a corresponding Go struct definition, TypeScript interface/type, or JSON Schema. It automatically maps JSON types to the target language's type system, handles nested objects and arrays, and respects naming conventions.

Simply paste your JSON data into the left text area, choose your target language (Go struct, TypeScript, or JSON Schema) from the buttons, adjust any options (like struct tag name or TypeScript style), and click the Convert button. The generated code appears in the right panel. Use the Copy button to save it to your clipboard.

Yes. When the target is set to Go Struct, you can enter any tag key (e.g., json, yaml, db) in the provided input box. The generated struct fields will include the corresponding struct tag with the original JSON key name.

In Go, null is mapped to interface{} (or any). In TypeScript it becomes any (you can manually adjust it to a more specific type like string | null later). JSON Schema marks the property as required but does not restrict the type when null is the only value.

No. All conversion happens entirely in your browser using client-side JavaScript. No data is ever transmitted to any server. Your data remains completely private and secure.

The converter supports Draft-04, Draft-07, 2019-09, and 2020-12. You can choose the draft from the dropdown and optionally include the $schema property. By default it generates Draft-07 with the $schema field.