diff --git a/crates/dbx-core/src/db/mysql.rs b/crates/dbx-core/src/db/mysql.rs
index aaa78e25a7..085e05437d 100644
--- a/crates/dbx-core/src/db/mysql.rs
+++ b/crates/dbx-core/src/db/mysql.rs
@@ -85,10 +85,10 @@ fn mysql_value_to_json(row: &MySqlRow, idx: usize, type_name: &str) -> serde_jso
 
     if upper_type == "JSON" {
         if let Ok(v) = row.try_get::<serde_json::Value, _>(idx) {
-            return v;
+            return serde_json::Value::String(v.to_string());
         }
         if let Ok(v) = row.try_get::<String, _>(idx) {
-            return serde_json::from_str::<serde_json::Value>(&v).unwrap_or(serde_json::Value::String(v));
+            return serde_json::Value::String(v);
         }
         return serde_json::Value::Null;
     }
diff --git a/crates/dbx-core/src/db/postgres.rs b/crates/dbx-core/src/db/postgres.rs
index 86dd55dbcf..3e4a835945 100644
--- a/crates/dbx-core/src/db/postgres.rs
+++ b/crates/dbx-core/src/db/postgres.rs
@@ -33,10 +33,10 @@ fn pg_value_to_json(row: &PgRow, idx: usize, type_name: &str) -> serde_json::Val
 
     if upper == "JSON" || upper == "JSONB" {
         if let Ok(v) = row.try_get::<serde_json::Value, _>(idx) {
-            return v;
+            return serde_json::Value::String(v.to_string());
         }
         if let Ok(v) = row.try_get::<String, _>(idx) {
-            return serde_json::from_str::<serde_json::Value>(&v).unwrap_or(serde_json::Value::String(v));
+            return serde_json::Value::String(v);
         }
         return serde_json::Value::Null;
     }
diff --git a/src/components/grid/DataGrid.vue b/src/components/grid/DataGrid.vue
index e9a0805d01..5d721d8eaf 100644
--- a/src/components/grid/DataGrid.vue
+++ b/src/components/grid/DataGrid.vue
@@ -470,11 +470,13 @@ function toggleSort(colName: string) {
   }
 }
 
+const CELL_DISPLAY_MAX_LENGTH = 256;
+
 function formatCell(value: CellValue): string {
   if (value === null) return "NULL";
   if (typeof value === "boolean") return value ? "true" : "false";
-  if (typeof value === "object") return JSON.stringify(value);
-  return String(value);
+  const s = typeof value === "object" ? JSON.stringify(value) : String(value);
+  return s.length > CELL_DISPLAY_MAX_LENGTH ? s.slice(0, CELL_DISPLAY_MAX_LENGTH) : s;
 }
 
 function quoteIdent(name: string): string {