We can check if a response of a fetch call is a JSON object with JavaScript by putting the fetch call in a try-catch block and use JSON.parse to parse the response string.
For instance, we can write:
const myFetch = async (myRequest) => {
try {
const response = await fetch(myRequest);
const text = await response.text();
const data = JSON.parse(text);
console.log(data)
} catch (err) {
console.log(err)
}
}
myFetch('https://yesno.wtf/api')
to create the myFetch function with the myRequest string parameter for the URL.
We pass myRequest into fetch to make the request
Then we call response.text to get the response string.
Next, we call JSON.parse with text to try to parse the response string.
If it’s successful, data should be assigned the parsed JSON object.
Otherwise, an error will be raised and err is logged.
