diff --git a/tools/upend_js/index.ts b/tools/upend_js/index.ts
index bde575e..5c8cdfa 100644
--- a/tools/upend_js/index.ts
+++ b/tools/upend_js/index.ts
@@ -8,14 +8,23 @@ export function listingAsOrdered(listing: ListingResult): OrderedListing {
     .sort(([_, a], [__, b]) => a.attribute.localeCompare(b.attribute));
 }
 
-export function asDict(attributes: OrderedListing): {
-  [key: string]: string;
-} {
-  const result = {} as { [key: string]: string };
-  attributes
-    .map(([_, attribute]) => attribute)
-    .forEach((attribute) => {
-      result[attribute.attribute] = attribute.value.c;
-    });
+export function asDict(attributes: IEntry[]) {
+  const result = {} as { [key: string]: { [key: string]: unknown } };
+  attributes.forEach((entry) => {
+    if (!result[entry.entity]) {
+      result[entry.entity] = {};
+    }
+    if (result[entry.entity][entry.attribute]) {
+      if (!Array.isArray(result[entry.entity][entry.attribute])) {
+        result[entry.entity][entry.attribute] = [
+          result[entry.entity][entry.attribute],
+        ];
+      }
+      (result[entry.entity][entry.attribute] as unknown[]).push(entry.value.c);
+    } else {
+      result[entry.entity][entry.attribute] = entry.value.c;
+    }
+  });
+
   return result;
 }