token-extension-metadata Refactored off-chain metadata fetching with …

…async/await and added err… (#358)

* Refactored off-chain metadata fetching with async/await and added error handling

- Replaced .then() with async/await for consistency and readability.
- Added a try/catch block for better error handling when fetching and parsing off-chain metadata.
- Utilized optional chaining for safer access to the URI property.

* fix(): syntax fix

---------

Co-authored-by: Onyewuchi Emeka <[email protected]>

content/courses/token-extensions/token-extensions-metadata.md

@@ -1082,11 +1082,14 @@ const onChainMetadata = await getTokenMetadata(connection, mint.publicKey);
 console.log("onchain metadata =====>", onChainMetadata);
 
 // And we can even get the off-chain json now
-if (onChainMetadata && onChainMetadata.uri) {
-  const offChainMetadata = await fetch(onChainMetadata.uri).then(res =>
-    res.json(),
-  );
-  console.log("Mint off-chain metadata =====>", offChainMetadata);
+if (onChainMetadata?.uri) {
+  try {
+    const response = await fetch(onChainMetadata.uri);
+    const offChainMetadata = await response.json();
+    console.log("Mint off-chain metadata =====>", offChainMetadata);
+  } catch (error) {
+    console.error("Error fetching or parsing off-chain metadata:", error);
+  }
 }
 ```
 
@@ -1290,11 +1293,14 @@ export default async function createNFTWithEmbeddedMetadata(
   console.log("onchain metadata =====>", onChainMetadata);
 
   // And we can even get the off-chain JSON now
-  if (onChainMetadata && onChainMetadata.uri) {
-    const offChainMetadata = await fetch(onChainMetadata.uri).then(res =>
-      res.json(),
-    );
-    console.log("Mint off-chain metadata =====>", offChainMetadata);
+  if (onChainMetadata?.uri) {
+    try {
+      const response = await fetch(onChainMetadata.uri);
+      const offChainMetadata = await response.json();
+      console.log("Mint off-chain metadata =====>", offChainMetadata);
+    } catch (error) {
+      console.error("Error fetching or parsing off-chain metadata:", error);
+    }
   }
 }
 ```