WebJul 30, 2024 · You should change the casing on the property to propTypes: - List.PropTypes = { + List.propTypes = { todos: PropTypes.array.isRequired, }; Correct: List.propTypes = { todos: PropTypes.array.isRequired, }; (The instance of a PropTypes object is lowercase, but the Class/Type is uppercase. The instance is List.propTypes. http://duoduokou.com/reactjs/40876178915649550727.html
How to apply validation on Props in ReactJS ? - GeeksforGeeks
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Example for a lightweight React JSON Form Builder
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