Free JSON to TypeScript Interface Generator Online
Use this free JSON to TypeScript tool to generate interfaces from a JSON sample. Fast, private, and works in your browser.
Loading tool…
What is JSON to TypeScript?
JSON to TypeScript inspects a sample JSON object and generates matching TypeScript interfaces, including nested types. It is useful for typing API responses quickly. Generation runs in your browser.
How to use this tool
- Paste a sample JSON object.
- Set the root interface name if you like.
- Click Generate and copy the TypeScript.
Features
- Generate interfaces from sample JSON
- Infers nested object and array types
- Customizable root interface name
- Copy the generated types
- Runs entirely in your browser
This tool runs in your browser. Your files and text are not uploaded to our servers, and we do not store your input.
Frequently asked questions
Does it handle nested objects?+
Yes. Nested objects become their own interfaces, and arrays infer their element type.
Is my JSON uploaded?+
No. The types are generated entirely in your browser.
What if values are null or mixed?+
Null or mixed values fall back to broader types like any or unions where needed.
Related tools
Looking for more Developer Tools?
Browse the full collection of free, browser-based tools.