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I am getting an error after writing this code:

fetchData = (data) => {

this.setState(imgLink: data.items[0].snippet.thumbnails.default.url); //at 0 iam getting error
this.setState(width: data.items[0].snippet.thumbnails.default.url.width);
this.setState(height: data.items[0].snippet.thumbnails.default.url.height);
}

here is the func call and how i fetch api

=>
{

// fetch the value entered in the input field
alert(channelId);
this.setState({channelId:channelId})
//fetch the value(channelId) that is enter in the input field
// make a request
var url = ; // hided by me here
alert(url);
this.setState({url: url});
return fetch(url)
.then((response) => response.json())
// fetchData(data);
.then((data) => {
fetchData = (data)
})
//now fetching the response from the yt api again and again
.setInterval(() =>
{
var url = ; // hided
return fetch(url)
.then((response) => response.json())
updateSubscribers = (response);
},0)

.catch((error) => {
console.log(error);
});
}

No need to write this.setState every time for different line you can just call it in a single line

this.setState({
imgLink: ----,
width: ----,
height: ----,
)}