diff --git a/lightrag/api/lightrag_server.py b/lightrag/api/lightrag_server.py
index 96315b82..0cf1d01e 100644
--- a/lightrag/api/lightrag_server.py
+++ b/lightrag/api/lightrag_server.py
@@ -1682,6 +1682,11 @@ def create_app(args):
             trace_exception(e)
             raise HTTPException(status_code=500, detail=str(e))
 
+    # query all graph labels
+    @app.get("/graph/label/list")
+    async def get_graph_labels():
+        return await rag.get_graph_labels()
+
     # query all graph
     @app.get("/graphs")
     async def get_knowledge_graph(label: str):
diff --git a/lightrag/base.py b/lightrag/base.py
index af060435..5f6a1bf1 100644
--- a/lightrag/base.py
+++ b/lightrag/base.py
@@ -198,6 +198,10 @@ class BaseGraphStorage(StorageNameSpace, ABC):
     ) -> tuple[np.ndarray[Any, Any], list[str]]:
         """Get all labels in the graph."""
 
+    @abstractmethod
+    async def get_all_labels(self) -> list[str]:
+        """Get a knowledge graph of a node."""
+
     @abstractmethod
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
diff --git a/lightrag/kg/age_impl.py b/lightrag/kg/age_impl.py
index 077c7321..97b3825d 100644
--- a/lightrag/kg/age_impl.py
+++ b/lightrag/kg/age_impl.py
@@ -60,6 +60,10 @@ class AGEQueryException(Exception):
 @final
 @dataclass
 class AGEStorage(BaseGraphStorage):
+    @staticmethod
+    def load_nx_graph(file_name):
+        print("no preloading of graph with AGE in production")
+
     def __init__(self, namespace, global_config, embedding_func):
         super().__init__(
             namespace=namespace,
@@ -616,6 +620,9 @@ class AGEStorage(BaseGraphStorage):
     ) -> tuple[np.ndarray[Any, Any], list[str]]:
         raise NotImplementedError
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/gremlin_impl.py b/lightrag/kg/gremlin_impl.py
index 39077b5f..3a26401d 100644
--- a/lightrag/kg/gremlin_impl.py
+++ b/lightrag/kg/gremlin_impl.py
@@ -403,6 +403,9 @@ class GremlinStorage(BaseGraphStorage):
     ) -> tuple[np.ndarray[Any, Any], list[str]]:
         raise NotImplementedError
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index 07b48f8b..0048b384 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -601,6 +601,24 @@ class MongoGraphStorage(BaseGraphStorage):
     # -------------------------------------------------------------------------
     #
 
+    async def get_all_labels(self) -> list[str]:
+        """
+        Get all existing node _id in the database
+        Returns:
+            [id1, id2, ...]  # Alphabetically sorted id list
+        """
+        # Use MongoDB's distinct and aggregation to get all unique labels
+        pipeline = [
+            {"$group": {"_id": "$_id"}},  # Group by _id
+            {"$sort": {"_id": 1}},  # Sort alphabetically
+        ]
+
+        cursor = self.collection.aggregate(pipeline)
+        labels = []
+        async for doc in cursor:
+            labels.append(doc["_id"])
+        return labels
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/neo4j_impl.py b/lightrag/kg/neo4j_impl.py
index de0273ad..0ddc611d 100644
--- a/lightrag/kg/neo4j_impl.py
+++ b/lightrag/kg/neo4j_impl.py
@@ -628,6 +628,31 @@ class Neo4JStorage(BaseGraphStorage):
         await traverse(label, 0)
         return result
 
+    async def get_all_labels(self) -> list[str]:
+        """
+        Get all existing node labels in the database
+        Returns:
+            ["Person", "Company", ...]  # Alphabetically sorted label list
+        """
+        async with self._driver.session(database=self._DATABASE) as session:
+            # Method 1: Direct metadata query (Available for Neo4j 4.3+)
+            # query = "CALL db.labels() YIELD label RETURN label"
+
+            # Method 2: Query compatible with older versions
+            query = """
+                MATCH (n)
+                WITH DISTINCT labels(n) AS node_labels
+                UNWIND node_labels AS label
+                RETURN DISTINCT label
+                ORDER BY label
+            """
+
+            result = await session.run(query)
+            labels = []
+            async for record in result:
+                labels.append(record["label"])
+            return labels
+
     async def delete_node(self, node_id: str) -> None:
         raise NotImplementedError
 
diff --git a/lightrag/kg/networkx_impl.py b/lightrag/kg/networkx_impl.py
index 3e7a08fd..9850b8c4 100644
--- a/lightrag/kg/networkx_impl.py
+++ b/lightrag/kg/networkx_impl.py
@@ -168,6 +168,9 @@ class NetworkXStorage(BaseGraphStorage):
             if self._graph.has_edge(source, target):
                 self._graph.remove_edge(source, target)
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/oracle_impl.py b/lightrag/kg/oracle_impl.py
index d65688da..af2ededb 100644
--- a/lightrag/kg/oracle_impl.py
+++ b/lightrag/kg/oracle_impl.py
@@ -670,6 +670,9 @@ class OracleGraphStorage(BaseGraphStorage):
     async def delete_node(self, node_id: str) -> None:
         raise NotImplementedError
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/postgres_impl.py b/lightrag/kg/postgres_impl.py
index a0e0f184..cbbd98c7 100644
--- a/lightrag/kg/postgres_impl.py
+++ b/lightrag/kg/postgres_impl.py
@@ -178,10 +178,12 @@ class PostgreSQLDB:
             asyncpg.exceptions.UniqueViolationError,
             asyncpg.exceptions.DuplicateTableError,
         ) as e:
-            if not upsert:
-                logger.error(f"PostgreSQL, upsert error: {e}")
+            if upsert:
+                print("Key value duplicate, but upsert succeeded.")
+            else:
+                logger.error(f"Upsert error: {e}")
         except Exception as e:
-            logger.error(f"PostgreSQL database, sql:{sql}, data:{data}, error:{e}")
+            logger.error(f"PostgreSQL database,\nsql:{sql},\ndata:{data},\nerror:{e}")
             raise
 
 
@@ -1085,6 +1087,9 @@ class PGGraphStorage(BaseGraphStorage):
     ) -> tuple[np.ndarray[Any, Any], list[str]]:
         raise NotImplementedError
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/kg/tidb_impl.py b/lightrag/kg/tidb_impl.py
index 7ba2cf66..4adb0141 100644
--- a/lightrag/kg/tidb_impl.py
+++ b/lightrag/kg/tidb_impl.py
@@ -560,6 +560,9 @@ class TiDBGraphStorage(BaseGraphStorage):
     async def delete_node(self, node_id: str) -> None:
         raise NotImplementedError
 
+    async def get_all_labels(self) -> list[str]:
+        raise NotImplementedError
+
     async def get_knowledge_graph(
         self, node_label: str, max_depth: int = 5
     ) -> KnowledgeGraph:
diff --git a/lightrag/lightrag.py b/lightrag/lightrag.py
index 0ba34ef7..db61788a 100644
--- a/lightrag/lightrag.py
+++ b/lightrag/lightrag.py
@@ -458,6 +458,10 @@ class LightRAG:
             self._storages_status = StoragesStatus.FINALIZED
             logger.debug("Finalized Storages")
 
+    async def get_graph_labels(self):
+        text = await self.chunk_entity_relation_graph.get_all_labels()
+        return text
+
     async def get_knowledge_graph(
         self, nodel_label: str, max_depth: int
     ) -> KnowledgeGraph:
diff --git a/lightrag/tools/lightrag_visualizer/graph_visualizer.py b/lightrag/tools/lightrag_visualizer/graph_visualizer.py
index 9950041f..8a6f0976 100644
--- a/lightrag/tools/lightrag_visualizer/graph_visualizer.py
+++ b/lightrag/tools/lightrag_visualizer/graph_visualizer.py
@@ -1,6 +1,6 @@
 from typing import Optional, Tuple, Dict, List
 import numpy as np
-
+import networkx as nx
 import pipmaster as pm
 
 # Added automatic libraries install using pipmaster
@@ -12,10 +12,7 @@ if not pm.is_installed("pyglm"):
     pm.install("pyglm")
 if not pm.is_installed("python-louvain"):
     pm.install("python-louvain")
-if not pm.is_installed("networkx"):
-    pm.install("networkx")
 
-import networkx as nx
 import moderngl
 from imgui_bundle import imgui, immapp, hello_imgui
 import community