React warns about Invalid DOM property for

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React warns about Invalid DOM property for

Author：JIYIK Last Updated：2025/03/15 Views：

htmlForTo fix the React.js warning "Invalid DOM property for. Did you mean htmlFor", you need to use the attribute instead of the tag for. The attribute is used htmlForbecause foris a reserved word in JavaScript.

React Invalid DOM property for

Below is an example that produces the above warning.

export default function App() {
  // ⛔️ Warning: Invalid DOM property `for`. Did you mean `htmlFor`?
  return (
    <div>
      <label for="firstName">First Name</label>
      <input id="firstName" type="text" />
    </div>
  );
}

The problem in the code example is that we use forthe attribute to match the label tag to the input , but foris a reserved word in JavaScript.

To eliminate the warning, we must use htmlForinstead of for. As shown in the following code

export default function App() {
  return (
    <div>
      <label htmlFor="firstName">First Name</label>
      <input id="firstName" type="text" />
    </div>
  );
}

htmlForforProperties are not specific to React.js, they are also used in browsers to set properties programmatically .

If we have some accessibility linting rules, we might have to wrap our input tag with our label.

export default function App() {
  return (
    <div>
      <label htmlFor="firstName">
        First Name
        <input id="firstName" type="text" />
      </label>
    </div>
  );
}

The reason we have to use in React htmlForis because forthe keyword is a reserved word - it is used for the for loop.

This is why classNameproperty is used instead of class. classThis word is reserved because it is used to declare an ES6 class.

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