Number input is string not integer in React

You can check the type and name of the target and handle the value accordingly.

For Example

this.setState({
  [e.target.name]: e.target.type === 'number' ? parseInt(e.target.value) : e.target.value
});

// or

this.setState({
  [e.target.name]: e.target.name === 'price' ? parseFloat(e.target.value) : e.target.value
});

You can use valueAsNumber property of the Input element

For example:

handleChange(e) {
    this.setState({
        [e.target.name]: e.target.valueAsNumber || e.target.value
    });
}

The e.target.valueAsNumber will give you the value as number or NaN if the input is empty.

The || e.target.value is a fallback in case the valueAsNumber is NaN.

The parseFloat in onChange wont work since 4. will be parsed as 4 and the user wont be able to type any new digits. Check react-input-number for numeric input in react.