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How to fix Invariant Violation: Objects are not valid as a React child error?

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To fix Invariant Violation: Objects are not valid as a React child error, we should make sure we put items in the braces that can be rendered.

For instance, we write

const Comp = () => {
  return (
    <>
      <p>{"foo"}</p>
      <p>{1}</p>
      <p>{null}</p>
    </>
  );
};

to render 'foo', 1 and null in the p elements.

null will render nothing.

And the other values will be displayed on the screen.

Objects can’t be rendered directly on the screen, so we’ve to convert them to strings with JSON.stringify if we want to show them on the screen.

For instance, we write

const Comp = () => {
  return (
    <>
      <p>{JSON.stringify({ foo: "bar" })}</p>
    </>
  );
};

to call JSON.stringify to convert { foo: "bar" } to a JSON string so they can be rendered.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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