JSON to TypeScript Interface Generator
Automatically generate TypeScript interfaces from your JSON data. Get type-safe definitions for your API responses, configuration files, or any JSON structure.
How to Use
- Paste your JSON — Paste a JSON object or array that represents your data structure.
- Click Convert — The tool analyzes your JSON and generates TypeScript interfaces automatically.
- Copy to your project — Copy the generated interfaces and paste them into your TypeScript project.
Key Features
- Automatic type inference from JSON values (string, number, boolean, null, arrays, objects)
- Nested interface generation for complex object structures
- Array type detection with union types when elements differ
- Optional property detection for keys that may be null
Use Cases
- Generating types for REST API response payloads
- Creating interfaces from JSON configuration files
- Bootstrapping TypeScript types from sample database records
Frequently Asked Questions
Are the generated interfaces accurate?
The generator infers types from your JSON values. For best results, provide JSON with representative data so all types are correctly detected.
Can I customize the generated interface names?
The root interface is named RootObject by default. You can rename it after copying the output to your project.
Does it handle nested objects?
Yes. Each nested object gets its own interface, and the parent interface references it by name. Deeply nested structures are fully supported.
What about arrays with mixed types?
Arrays with mixed element types generate union types. For example, an array containing strings and numbers becomes (string | number)[].
Can I customize the generated interface name?
The root interface is named 'Root' by default. You can rename it after copying the output to your project.