JSON to TypeScript Converter

What is a JSON to TypeScript Converter?

A JSON to TypeScript converter takes any valid JSON object or array and automatically generates the corresponding TypeScript interface definitions that match the JSON structure. TypeScript is a statically typed superset of JavaScript that requires developers to define the shape of their data using interfaces or type aliases. When working with external APIs, database responses, or configuration files, writing TypeScript interfaces by hand is tedious and error-prone — especially for deeply nested JSON with many fields. The JSON to TypeScript Converter analyzes the structure of your JSON, infers the TypeScript types for each field (string, number, boolean, null, nested object, array), generates proper interface names based on the object structure, and handles nested objects recursively. The result is a set of TypeScript interfaces that you can paste directly into your TypeScript project and immediately use for type-safe data handling.

How to Use JSON to TypeScript Converter

1. Paste your JSON data — a single object or an array — into the left input panel.
2. Click 'Sample' to load an example JSON response and see the generated interfaces.
3. The converter automatically analyzes the JSON structure and generates TypeScript interfaces.
4. Click ⚡ Convert or press Ctrl+Enter to generate your TypeScript interface definitions.
5. Review the generated interfaces in the right panel — nested objects become separate interfaces.
6. Click Copy to copy the TypeScript interfaces to your clipboard and paste them into your project.

Frequently Asked Questions