All Tools VerseJSON to TypeScript Interfaces
Generate TypeScript interfaces from a JSON sample, with nested objects becoming named interfaces.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Processed locally in your browser. Your JSON never leaves this tab.
How to Use JSON to TypeScript Interfaces
- Paste a JSON sample. A representative object works best.
- Generate interfaces. Types are inferred from the values.
- Read the result. Nested objects become their own named interfaces.
- Copy the result. Click Copy result. It all runs in your browser.
Frequently Asked Questions
How are types inferred?
From the values in your sample. Numbers become number, text becomes string, true or false becomes boolean, and objects become named interfaces.
How are arrays typed?
By the first element, so a list of numbers becomes number[]. An empty list becomes any[].
Should I review the output?
Yes. Inference is based on one sample, so optional or mixed fields may need a manual tweak.
Is my data sent anywhere?
No. The generation runs entirely in your browser, so your JSON never leaves the tab.
Is it free?
Yes. Every tool here is free to use with no sign up.
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