Unexpected token, expected "]"

[Darshan972]

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 how i call this func and fetch api:

onPressedButton = channelId =>
{

// 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 = API_key;
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 = API_key;
return fetch(url)
.then((response) => response.json())
updateSubscribers(response);
},0)

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