How to Use JSON to TypeScript
Paste JSON and get inferred TypeScript interfaces for every nested object — types for strings, numbers, booleans, arrays and nested shapes.
Open the JSON to TypeScript tool →What is JSON to TypeScript?
Turn JSON into TypeScript interfaces automatically. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use JSON to TypeScript
- Open the JSON to TypeScript tool.
- Paste or type your input.
- Set any options provided.
- Copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
How accurate are the generated types?
They're inferred from your sample JSON, so they reflect that example. Add optional or union types by hand where fields vary between records.
Does it handle nested objects and arrays?
Yes — it creates nested interfaces and infers array element types.
Is my JSON uploaded?
No — the interfaces are generated in your browser.
Ready to try it?
Open JSON to TypeScript →