JSON to TypeScript Converter
Instantly convert JSON payloads into perfectly formatted TypeScript interfaces.
What is a JSON to TypeScript Converter?
A JSON to TypeScript converter automatically generates TypeScript type definitions (interfaces or types) from JSON data. Instead of manually writing TypeScript interfaces for API responses, database records, or configuration files, you can paste raw JSON and instantly get properly typed TypeScript interfaces. This saves time, reduces errors, and ensures your TypeScript code accurately reflects your data structures. Our converter handles nested objects, arrays, optional fields, and union types.
How to Convert JSON to TypeScript Interfaces
- 1Paste your JSON data
Copy a JSON object (e.g., an API response) and paste it into the input editor.
- 2Configure options
Choose the root interface name and whether to use interfaces or type aliases.
- 3Generate TypeScript
Click "Convert" to instantly generate properly formatted TypeScript interfaces.
- 4Copy and use
Copy the generated TypeScript code directly into your project.
Frequently Asked Questions
Does it handle nested JSON objects?
Yes. The converter recursively processes nested objects and creates separate named interfaces for each nested structure, properly referencing them in the parent interface.
How does it handle arrays?
Arrays are typed based on their contents. If an array contains objects, a separate interface is generated. If it contains primitives, the appropriate TypeScript type (string[], number[], etc.) is used.
Can I use this for API response typing?
Absolutely. This is the most common use case. Paste an API response, generate the interfaces, and use them in your fetch calls or API client for full type safety.
Why Use DevDeck?
Writing TypeScript interfaces manually from JSON is tedious and error-prone. DevDeck generates accurate interfaces instantly, and since it runs in your browser, your API responses and data structures remain completely private.