Bug: Improve clarity of “Objects are not valid as a React child” error message

[mouadabdelmalki]

When passing an object as a child, React currently shows:

Objects are not valid as a React child (found: [object Object])

For beginners, this message can be confusing. It may be more helpful if the error:

• Suggests checking for JSON.stringify(obj) or mapping over arrays of objects.
• Provides a link to relevant docs.

Proposal: Update the error message to something like:

"Objects cannot be rendered as children. Did you mean to convert it to a string with JSON.stringify(obj), or render its properties in JSX?"

This would make the error more beginner-friendly and reduce common confusion.

React version: 18.x (latest stable)

Steps To Reproduce

1 - Create a new React app (e.g., with create-react-app, Vite, or CodeSandbox).

2 - Add the following component:

export default function App() {
const obj = { name: "React" };
return

{obj}

;
}

3 - Run the application.

[reizhafajrian]

React elements must resolve into something that can be turned into DOM nodes (or strings for text). Valid children in JSX are:

Primitives: strings, numbers, null, undefined, true, false

React elements: e.g. <div>hello</div>