JSON to TypeScript Interface Generator
Convert JSON payloads into clean, strongly typed TypeScript interfaces with automatic type inference.
How to Use JSON to TypeScript
- Paste your JSON payload or API response into the left textarea.
- Specify your desired root interface name (defaults to RootObject).
- Click 'Generate TypeScript' to view cleanly formatted TypeScript interfaces.
- Copy the generated TypeScript definitions into your project.
Technical Specifications & How It Works
Writing manual TypeScript interfaces for large API payloads is time-consuming and prone to transcription errors.
This generator recursively parses JSON properties, identifies primitive types (string, number, boolean), handles array elements, and creates separate named interfaces for nested objects.
Your proprietary data payloads never leave your computer: all type inference runs entirely in local browser memory.
Frequently Asked Questions
How does the converter handle nested objects?
Nested objects are automatically extracted into their own PascalCase interfaces and linked via property references.
What happens if an array is empty?
Empty arrays default to any[] so you can easily specify the expected element type in your codebase.
Are null values supported?
Properties containing null values are typed as any, allowing you to assign union types like string | null.