How to generate typescript react prop types from json
- Step 1Get a sample of the component's data — Collect the JSON object that the component will receive as props — from an API response, a parent component's state, or a Storybook story's args. Use the most complete sample that includes all optional fields.
- Step 2Generate the TypeScript interface — Paste the JSON and click Convert. The output is a TypeScript interface with a name like GeneratedType. Copy the interface.
- Step 3Rename and place the interface — Rename the generated interface to match the component: UserCardProps, ProductListProps, OrderSummaryProps. Place it at the top of the component file or in a separate types.ts file.
- Step 4Apply the interface as the component's props type — const UserCard: React.FC<UserCardProps> = ({ name, email, role }) => {...}. The TypeScript compiler now catches any mismatch between the passed props and the declared interface.
Frequently asked questions
How do I handle nullable props — for example, a user that might be null before loading?+
Add | null to the generated type: user: UserType | null. For the whole props object, use an optional type param: Props<T extends UserType | null = UserType>. The generated interface is a starting point — refine nullable and optional types based on your component's actual behavior.
Should I use interface or type alias for React prop types?+
Both work for prop types. The convention in most React TypeScript codebases is interface for component props because interfaces are more idiomatic for describing object shapes and support declaration merging. Use type alias when you need union types in the prop definition: type ButtonProps = { variant: 'primary' | 'secondary' } & React.ButtonHTMLAttributes<HTMLButtonElement>.
Is the component data transmitted to JAD Apps?+
No. Conversion runs entirely in your browser. Component prop data and API samples are never transmitted to JAD Apps servers.
Privacy first
Conversion runs locally in your browser. No file is uploaded — only metadata counters are saved for signed-in dashboard stats.