Is my JSON data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

How are required props determined?

Every prop is marked with .isRequired, except fields whose sample value is null.

Who is this tool for?

It is mainly useful for legacy React components that validate their props with PropTypes instead of TypeScript.

100% local — your data never leaves your browser

JSON to React PropTypes Converter — Free Online Tool

Convert JSON to React PropTypes instantly in your browser. Free, private and offline-friendly: your data never leaves your device.

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Root name

JSON input

PropTypes output

Why convert JSON to PropTypes?

Legacy React components often validate their props with PropTypes. Paste a sample JSON payload above and get a ready-to-use PropTypes.shape definition in milliseconds, instead of writing it field by field.

How it works

The converter parses your JSON locally and builds nested PropTypes.shape declarations. Every field is marked .isRequired, except fields whose value is null, so the generated validation matches your sample payload.

Frequently asked questions

Is my JSON data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
How are required props determined?: Every prop is marked with .isRequired, except fields whose sample value is null.
Who is this tool for?: It is mainly useful for legacy React components that validate their props with PropTypes instead of TypeScript.