JSON to TypeScript Converter

About JSON to TypeScript Converter

The JSON to TypeScript Converter instantly generates strongly-typed TypeScript interfaces from any JSON payload. Whether you are integrating REST APIs, building Angular/React/Vue applications, or scaffolding data models, this tool eliminates manual interface writing and ensures type safety across your TypeScript codebase.

Key Features

• Interface generation — creates TypeScript interfaces with properly inferred types for all JSON values.
• Type alias support — optionally use type aliases instead of interface declarations.
• Optional properties — mark all properties as optional with the ? modifier for flexible typing.
• Export modifier — add export to interfaces for module-based TypeScript projects.
• Nested object handling — recursively generates separate interfaces for nested objects.
• Array type inference — correctly infers array element types including union types for mixed arrays.

How to Use

1. Input JSON — paste JSON into the left editor, upload a file, or fetch from a URL.
2. Configure — set the root interface name and toggle optional props, export, or type alias.
3. Convert — click Convert to TypeScript or press Ctrl+Enter.
4. Export — copy to clipboard or download as a .ts file.