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Dummy JSON Generator
Generate realistic sample JSON data for testing: users, products or posts.
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JSON to TypeScript Interfaces
Generate TypeScript interfaces from a sample JSON object.
Optional fields can't be detected from a single sample — mark them with ? yourself.
Good to know
Frequently asked questions
How do I use it?
Enter your json sample, adjust the options and press “Generate types”. Check the result, then copy or download it.
How does it work?
Infers types from the sample; nested objects get their own interfaces and identical shapes are reused.
Are there limitations?
Optional fields can't be detected from a single sample — mark them with ? yourself.
Is my data uploaded?
No. Everything is processed in your browser and nothing is sent to a server. No account is needed.
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