JSON to TypeScript
Turn sample API data into a typed starting point for frontend or Node.js code. Nested objects become named interfaces, arrays infer their item type, and property names that are not identifiers are quoted.
JSON to TypeScript
Generate a TypeScript interface from representative JSON.
Sample JSON0 lines
Output0 lines
1Ready. Load an example or paste JSON to begin.Ready. Load an example or paste JSON to begin.
Parse summary
- Root
- -
- Keys
- -
- Depth
- -
- Size
- -
Type counts
strings -numbers -booleans -nulls -objects -arrays -
Structure preview
No valid JSON preview.
Data handling notes
- Generation runs locally and does not upload API examples.
- All observed object keys are generated as required properties.
- Mixed arrays use a union of the value types found in the sample.
Before you rely on the result
This tool is intended for fast inspection and routine preparation. It can save time, but it does not replace review when the result affects production systems, security settings, business data, or legal obligations.
- Check representative inputs instead of assuming one example covers every edge case.
- Do not paste secrets, private customer data, or credentials unless you have confirmed the page processes that data locally and the use is allowed by your organization.
- Copy the output into your own workflow only after checking formatting, timezone, encoding, or syntax assumptions.
- Data conversion tools preserve structure where possible, but they cannot infer business rules such as optional fields, database dialects, XML namespaces, or CSV column meaning.
FAQ
Are optional properties inferred?No. A single object cannot prove optionality, so observed keys are required until you edit them.
Does it generate runtime validation?No. Interfaces are compile-time types and do not validate data at runtime.