Fix for 2825

New utility method for converting to atob with stringification checks
Updated Parser for Blobs

packages/core/util.ts

@@ -133,7 +133,23 @@ export function hOP<T extends string>(o: any, p: T): boolean {
     return Object.hasOwnProperty.call(o, p);
 }
 
-
+/**
+ * @returns validates and returns a valid atob conversion
+*/
+export function parseToAtob(str: string): string {
+    const base64Regex = /^[A-Za-z0-9+/]+={0,2}$/;
+    try {
+        // test if str has been JSON.stringified
+        const parsed = JSON.parse(str);
+        if(base64Regex.test(parsed)){
+            return atob(parsed);
+        }
+        return null;
+    } catch (err) {
+        // Not a valid JSON string, check if it's a standalone Base64 string
+        return base64Regex.test(str) ? atob(str) : null;
+    }
+}
 
 /**
  * Generates a ~unique hash code

packages/queryable/behaviors/parsers.ts

@@ -1,5 +1,5 @@
 import { Queryable } from "../queryable.js";
-import { hOP, TimelinePipe } from "@pnp/core";
+import { hOP, TimelinePipe, parseToAtob } from "@pnp/core";
 import { isFunc } from "@pnp/core";
 
 export function DefaultParse(): TimelinePipe {
@@ -25,7 +25,21 @@ export function TextParse(): TimelinePipe {
 
 export function BlobParse(): TimelinePipe {
 
-    return parseBinderWithErrorCheck(r => r.blob());
+    return parseBinderWithErrorCheck( async (response) => {
+        const responseBody = parseToAtob(await response.clone().text());
+        // handle batch responses for things that are base64, like photos https://github.com/pnp/pnpjs/issues/2825
+        if(responseBody){
+            // Create an array buffer from the binary string
+            const arrayBuffer = new ArrayBuffer(responseBody.length);
+            const uint8Array = new Uint8Array(arrayBuffer);
+            for (let i = 0; i < responseBody.length; i++) {
+                uint8Array[i] = responseBody.charCodeAt(i);
+            }
+            // Create a Blob from the array buffer
+            return new Blob([arrayBuffer], {type:response.headers.get("Content-Type")});
+        }
+        return response.blob();
+    });
 }
 
 export function JSONParse(): TimelinePipe {