The Response object to validate
Type predicate indicating if the response contains JSON content
// Valid JSON response
const jsonResponse = new Response('{"data": "test"}', {
headers: { 'Content-Type': 'application/json' }
});
if (isJsonResponse(jsonResponse)) {
const data = await jsonResponse.json();
console.log('JSON data:', data);
}
// Non-JSON response
const htmlResponse = new Response('<html>...</html>', {
headers: { 'Content-Type': 'text/html' }
});
if (!isJsonResponse(htmlResponse)) {
console.log('Not a JSON response');
}
Type guard to validate if a Response object contains JSON content. Checks both the Content-Type header and ensures it's a valid Response object.