Turn JSON samples into TypeScript interfaces
When you consume a new API, writing every property and nested object by hand is slow and error-prone. This converter uses a JSON sample to infer a practical TypeScript shape that you can copy into your project and refine.
Generate types in three steps
- Paste a representative, valid JSON sample into the input editor.
- Set a meaningful root interface name for your codebase.
- Select Generate TS, then copy and review the output.
Review generated types before production
Generated definitions are a starting point, not a contract. A single example may not capture nullable values, optional fields, dates, enums, or alternate response shapes. Validate the result against your API documentation and test data before relying on it in production.
JSON to TypeScript FAQ
What does a JSON to TypeScript converter do? ⌄
It reads a JSON sample and generates TypeScript types or interfaces that represent the sample’s object structure. This saves time when starting typed API integrations.
How do I generate TypeScript interfaces from JSON? ⌄
Paste valid JSON into the input editor, choose a root interface name, and select Generate TS. The generated TypeScript appears in the output editor for you to copy.
Is my JSON sent to a server? ⌄
No. Generation runs locally in your browser, so the tool does not upload the JSON you paste into it.
Can generated TypeScript need manual changes? ⌄
Yes. A single JSON example cannot express every possible response shape. Review optional fields, unions, dates, and naming conventions before using generated types in production.
Why must the input be valid JSON? ⌄
The generator needs a valid JSON structure to infer properties and nested objects. Correct syntax errors before generating types.