Nested structures
Objects and arrays become readable named interfaces instead of one oversized inline type.
All tools
Developer tool
JSON to TypeScript / Zod
Paste JSON and generate typed interfaces or a runtime-ready Zod schema in seconds.
Private by default. Processing happens in your browser.
- Add your inputChoose a file, paste content, or enter details.
- Choose settingsReview the useful defaults, then adjust if needed.
- Save the resultCopy or download the finished output.
JSON type generator
Generate nested TypeScript interfaces or a ready-to-use Zod schema.
JSON input
Objects, arrays, primitives, and null values
Generate
TypeScript output
Nested structures and mixed arrays are inferred automatically.
Generated TypeScript appears hereGeneration runs locally. No JSON is sent to a server.
Types that follow your data
Start from a real response payload and get a clean foundation for application code.
Static types or runtime checks
Choose TypeScript for compile-time guidance or Zod when incoming data also needs runtime validation.
Frequently asked questions
What does the generator infer?
It detects objects, arrays, strings, numbers, booleans, null values, nested structures, and optional fields found across object arrays.
How are optional fields detected?
When an array contains objects with different keys, properties missing from one or more objects are marked optional in generated TypeScript interfaces.
Can it generate Zod schemas?
Yes. Choose Zod schema to generate a runtime validator plus its inferred TypeScript type. Install Zod in the project where you use the output.
Does my JSON leave the browser?
No. JSON parsing and code generation happen entirely on your device.
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