JSON to React PropTypes Converter
Paste a JSON sample to instantly generate a matching propTypes object for a React component, with nested shapes, arrays, and required fields inferred automatically. Free online developer tool.
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React PropTypes
PropTypes definitions will appear here...
Free JSON to React PropTypes Converter
Paste a JSON sample to instantly generate a matching propTypes object for a React component built with the prop-types package. Nested objects becomePropTypes.shape({...}), arrays become PropTypes.arrayOf, and fields that are present in every sample are marked .isRequired automatically.
How to Use It
Paste any JSON object into the input box, or click "Load Example" to see a sample run. The converter parses your JSON, infers a prop type for every field, and generates a singleMyComponent.propTypes = {...} assignment with nested objects described inline as shapes.
Example
Given {"name": "Ann", "tags": ["a","b"], "address": {"city": "NYC", "zip": null}}, the tool generates name: PropTypes.string.isRequired,tags: PropTypes.arrayOf(PropTypes.string).isRequired, and anaddress: PropTypes.shape({ city: PropTypes.string.isRequired, zip: PropTypes.string })entry for the nested object.
Common Use Cases
- Adding runtime prop validation to a plain JavaScript React component quickly.
- Documenting the expected shape of props for a component that receives API data.
- Bootstrapping propTypes for legacy React codebases that haven't migrated to TypeScript.
- Checking at a glance which props should be required versus optional.
FAQs
How is .isRequired decided?
A field gets .isRequired whenever it was present in every sample object you pasted. If you paste an array of objects and a property is missing from at least one of them, it's left without.isRequired instead.
Do I need to rename MyComponent in the output?
Yes — the generated code uses MyComponent as a placeholder. Replace it with the actual name of the component you're adding prop types to before pasting it into your project.
Is my JSON uploaded anywhere?
No — parsing and PropTypes generation happen entirely client-side in your browser. Nothing you paste is sent to a server.