JSON to TypeScript
Convert JSON to TypeScript interfaces or types instantly in your browser.
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What is JSON to TypeScript?
Developers often need TypeScript types from sample JSON API responses. This tool generates interfaces automatically.
How to use
Paste valid JSON.
Choose interface or type alias.
Copy the generated TypeScript.
Benefits
- Nested objects supported
- Optional root type name
- Pairs with JSON Formatter
Frequently Asked Questions
Does this handle nested JSON objects?
Yes. Nested objects and arrays become nested TypeScript interfaces or types with inferred property types.
Should I use interface or type?
Interfaces are the default and extend cleanly. Choose type alias when you prefer union-style definitions or team conventions.
What if my JSON is invalid?
Paste valid JSON only — run JSON Validator first if needed. Invalid input shows an error instead of generated types.
Is this tool free?
Yes. This tool is completely free to use with no sign-up, no limits, and no hidden fees.
Does my data leave my browser?
No. All processing happens entirely in your browser using client-side JavaScript. Your data is never sent to a server or stored anywhere.
Does this tool work on mobile?
Yes. PeasyDo tools work in modern mobile browsers on iOS and Android. For file tools, use a browser that supports file uploads and downloads.
Do I need to install software?
No. Everything runs in your browser — no desktop app, plugin, or account required.
Feedback & report a problem
Found a bug or have a suggestion? Let us know — it helps us improve this tool.
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