JSON to TypeScript

Manually writing TypeScript interfaces for complex API responses is tedious and error-prone. This tool automates the process by parsing your JSON and inferring the structure. It walks through objects and arrays to build a complete type definition, handling primitive types and nested relationships automatically. It's a must-have for developers working with external APIs or large configuration files.

1. Paste your JSON object into the input area on the left.
2. Your TypeScript interfaces will generate automatically on the right.
3. Copy the code to your clipboard and drop it straight into your project.

• Generating types for a third-party API response to ensure type safety.
• Converting a large config file into a typed structure.
• Quickly scaffolding data models for a new React component.
• Learning how different JSON structures map to TypeScript definitions.

• Instant Interface Generation: Turn raw JSON into strict TypeScript types in milliseconds.
• Nested Object Support: Handles complex, deep-nested structures with ease.
• Smart Type Detection: accurately infers string, number, boolean, array, and null types.
• Privacy-Focused: Your data never leaves your browser; all processing is local.

The tool traverses the JSON syntax tree. For every object key, it determines the value's type. If the value is an object, it creates a nested interface. If it's an array, it checks the contents to define the array type (e.g., `string[]` or `User[]`). This recursive process ensures accurate and comprehensive type coverage.

All calculations and data processing for this tool are performed locally in your browser. UtilToolkits does not send any of your data to an external server, ensuring your information remains private and secure.