JSON to React PropTypes Generator Online

Generate React PropTypes from JSON payloads

React components benefit from runtime prop validation during development, especially when props mirror API response shapes. Writing nested PropTypes.shape definitions by hand is repetitive and drifts quickly when payloads change. This generator inspects your JSON sample and emits PropTypes definitions you can paste into a component file.

What this tool does

Paste JSON in the input panel. The converter walks nested objects and arrays, infers primitive and composite shapes, and outputs a PropTypes shape tree with arrayOf helpers for list fields. You can customize the exported constant name before copying the result.

Configuration options

PropTypes Export Name: Rename the exported PropTypes constant generated from your JSON sample.

Common use cases

Bootstrap prop validation for components that render API data.
Create starter PropTypes before migrating to TypeScript interfaces.
Document expected prop shapes for frontend teams.
Compare inferred validators against OpenAPI or JSON Schema contracts.

Related tools

Prefer static TypeScript types? Try the JSON to TypeScript POJO Generator or JSON to io-ts. For MobX State Tree models, use the JSON to MobX State Tree tool.

Frequently Asked Questions

Does my JSON leave the browser?

No. Conversion runs entirely in your browser. Your JSON is never uploaded to a server, which makes the tool safe for internal API samples and production-like fixtures.

Do I need to install prop-types in my project?

Yes. The generated output imports prop-types. Install it in your React project, assign the exported shape to your component propTypes property, and enable validation during development builds.

Can I rename the exported PropTypes constant?

Yes. Use the PropTypes Export Name field to control the exported constant name. Nested shape helpers keep generated structure based on keys in your JSON sample.

Should I use PropTypes or TypeScript?

TypeScript gives compile-time safety, while PropTypes adds runtime checks in development. Many teams use TypeScript for new code and keep PropTypes for legacy JavaScript components or gradual migration paths.

Report

JSON To PropTypes