JSON to TypeScript is a free online tool that converts JSON or JSON5 into TypeScript interfaces and type definitions instantly in your browser. Supports nested objects, union types, array merging, and JSON5. No data is sent to any server.
What is JSON to TypeScript?
JSON to TypeScript converts JSON data into TypeScript interface and type definitions. Paste any JSON — including JSON5 with comments and trailing commas — and get ready-to-use TypeScript types. Nested objects are automatically extracted into separate named types, and arrays of objects are intelligently merged.
Generating TypeScript types from API responses. Creating type definitions for JSON config files. Converting JSON Schema data to TypeScript for static typing. Building type-safe data layers from mock data.
How to Use
- 1
Paste your JSON
Paste JSON or JSON5 data into the input area. The tool auto-detects JSON5 syntax.
- 2
Configure options
Set the root type name, choose between interface and type alias, and toggle the export keyword.
- 3
Copy TypeScript output
The TypeScript definitions appear instantly. Click copy to use them in your project.