CORS not working with React app - ajax

Question

I tried to make a request from wikipedia api. Though I use a normal node.js server (localhost) i get this in the console:
XMLHttpRequest cannot load https://en.wikipedia.org/w/api.php?action=query&format=json&prop=pageimages&generator=search&piprop=name|original&pilimit=max&gsrsearch=Horse&gsrlimit=20. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
This is my react component:
import React, {Component} from 'react';
import axios from 'axios';
class WikipediaViewer extends Component {
constructor(props) {
super(props);
this.state = {
data: null
}
}
componentDidMount() {
axios.get('https://en.wikipedia.org/w/api.php?action=query&format=json&prop=pageimages&generator=search&piprop=name|original&pilimit=max&gsrsearch=Horse&gsrlimit=20')
.then(data => {
this.setState({
data: data
});
console.log(data);
})
}
render() {
return (
<h1>HEllo world!</h1>
);
}
}
export default WikipediaViewer
After having issus with the request I add following config options according to the axios documentation:
componentDidMount() {
axios.get({
method: 'get',
url: 'https://en.wikipedia.org/w/api.php?action=query&format=json&prop=pageimages&generator=search&piprop=name|original&pilimit=max&gsrsearch=Horse&gsrlimit=20',
headers: {'X-Requested-With': 'XMLHttpRequest'},
withCredentials: true,
}).then(data => {
this.setState({
data: data
});
console.log(data);
})
}
Result:
GET http://localhost:3000/[object%20Object] 404 (Not Found)
Why am I have to get this error, though I'm working locally. Btw I used the "Allow-Control-Allow-Origin: *" Chrome extension from vitcad as well and it doesn't work.