diff --git a/.changeset/small-pillows-hug.md b/.changeset/small-pillows-hug.md
new file mode 100644
index 00000000..a5eebe29
--- /dev/null
+++ b/.changeset/small-pillows-hug.md
@@ -0,0 +1,5 @@
+---
+"@tus/azure-store": patch
+---
+
+Fix metadata parsing bug
diff --git a/packages/azure-store/src/index.ts b/packages/azure-store/src/index.ts
index c80ecd5f..f0385e96 100644
--- a/packages/azure-store/src/index.ts
+++ b/packages/azure-store/src/index.ts
@@ -117,7 +117,15 @@ export class AzureStore extends DataStore {
     const upload = JSON.parse(propertyData.metadata.upload) as Upload
     // Metadata is base64 encoded to avoid errors for non-ASCII characters
     // so we need to decode it separately
-    upload.metadata = Metadata.parse(JSON.stringify(upload.metadata ?? {}))
+    let metadataStr
+    if (typeof upload.metadata === 'string') {
+      metadataStr = upload.metadata
+    } else if (upload.metadata && typeof upload.metadata === 'object') {
+      metadataStr = JSON.stringify(upload.metadata ?? {})
+    } else {
+      metadataStr = '{}'
+    }
+    upload.metadata = Metadata.parse(metadataStr)
 
     await this.cache.set(appendBlobClient.url, upload)