20251105 json storage limits (#35751)

* 20251105 json storage limits

Co-authored-by: Benjamin Petersen <101329882+bpp-incom@users.noreply.github.com>

* Update json-data-type.md

---------

Co-authored-by: Benjamin Petersen <101329882+bpp-incom@users.noreply.github.com>

Author: WilliamDAssafMSFT

docs/t-sql/data-types/json-data-type.md

@@ -4,7 +4,7 @@ description: The native JSON data type provides advantages for storing JSON data
 author: WilliamDAssafMSFT
 ms.author: wiassaf
 ms.reviewer: randolphwest, jovanpop, umajay
-ms.date: 09/16/2025
+ms.date: 11/05/2025
 ms.service: sql
 ms.subservice: t-sql
 ms.topic: reference
@@ -148,6 +148,20 @@ Currently, the `OPENJSON()` function doesn't accept the **json** data type in so
 
 - In [!INCLUDE [sssql25-md](../../includes/sssql25-md.md)], the `OPENJSON()` function does support **json**. For more information, see [Key JSON capabilities in SQL Server 2025](../../relational-databases/json/json-data-sql-server.md#key-json-capabilities).
 
+### Size limitations
+
+Size limits of JSON data in storage:
+
+| Field | Limitation |
+|:--|:--|
+| JSON data type size (binary) | Up to 2GB |
+| Number of unique keys | Up to 32K |
+| Per key string size | 7998 bytes |
+| Per string value size | 536870911 bytes |
+| Number of properties in one object | Up to 65535 |
+| Number of elements in one array | Up to 65535 |
+| Number of nested levels in JSON document | 128 |  
+
 ## Related content
 
 - [Store JSON documents](../../relational-databases/json/store-json-documents-in-sql-tables.md)