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ToolBay

JSON to Model Online Free

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Generate TypeScript, Swift, Kotlin, Dart, C#, Java, Go, or Rust models from sample JSON. Nested objects and arrays included.

  • Processed in your browser
  • Privacy-first
  • No account required
  • Nothing uploaded by default

Examples

Nested object

{"id":1,"owner":{"email":"a@b.com"}}
interface Root { id: number; owner: Owner; }

How JSON to Model works

Generate TypeScript, Swift, Kotlin, Dart, C#, Java, Go, or Rust models from sample JSON. Nested objects and arrays included. Runs locally in your browser.

  1. 1. Add input. Paste, type, or upload. Use a sample if you just want to see it work.
  2. 2. Run it. Processing happens in the browser.
  3. 3. Copy or download. Take the output and close the tab.
  • Nested object
Which languages are supported?
TypeScript, Swift, Kotlin, Dart, C#, Java, Go, and Rust. Types are inferred from your sample JSON.
Are nullable and mixed types perfect?
Generation is best-effort from one sample. Mixed arrays and missing fields may need manual review.

ToolBay does not store your input. Close the tab and it is gone. More developer tools.

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