JSON to TypeScript/Go/C#/Java
Free online JSON to type definition tool, TypeScript/Go/C#/Java
Why Convert JSON to Type Definitions?
When working with API responses, generating type definitions from sample JSON data saves time and reduces errors. Instead of manually writing interfaces or structs, paste a JSON response and get type definitions for TypeScript interfaces, Go structs, C# classes, or Java classes.
How to Convert JSON to Types
Paste your JSON data in the input area. Select the target language. The tool analyzes the JSON structure and generates appropriate type definitions with proper field names, types, and optional markers for nullable fields.
▶What types of JSON are supported?
The tool works with any valid JSON: objects, arrays, nested structures, and primitive values. Arrays of objects produce the most useful type definitions.
▶How are nested objects handled?
Nested objects are converted into separate types or embedded types depending on the target language conventions. Each level of nesting gets its own type definition.
▶Does the tool handle optional fields?
The tool marks fields as optional when they appear in some objects but not all in the sample data. This is common when converting arrays of objects where not all objects have the same fields.