diff --git a/server/Server.js b/server/Server.js
index 841001586..6ac69692f 100644
--- a/server/Server.js
+++ b/server/Server.js
@@ -217,6 +217,15 @@ class Server {
             console.debug(body)
           }
         },
+        formats: [
+          // Define custom format types for OpenAPI spec
+          {
+            name: 'uuid',
+            type: 'string',
+            validate: (v) => /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/.test(v.toString())
+          }
+        ],
+        unknownFormats: ['li_[a-z0-9]{18}', '[0-9]*'],
         ignoreUndocumented: true
       })
     )