diff --git a/data-explorer/kusto/query/node-id.md b/data-explorer/kusto/query/node-id.md
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+---
+title:  node_id (graph function)
+description:  This article describes the node_id() function.
+ms.topic: reference
+ms.date: 10/29/2025
+---
+
+# node_id() (graph function)
+
+> [!INCLUDE [applies](../includes/applies-to-version/applies.md)] [!INCLUDE [fabric](../includes/applies-to-version/fabric.md)] [!INCLUDE [azure-data-explorer](../includes/applies-to-version/azure-data-explorer.md)]
+
+The `node_id` function calculates the graph node identifier as it was set by the user either in make-graph or graph model.
+
+> [!NOTE]
+> This function is used with the [`graph-match`](graph-match-operator.md) and [`graph-shortest-paths`](graph-shortest-paths-operator.md) operators.
+
+> [!WARNING]
+> This feature is currently in public preview. Functionality and syntax are subject to change before General Availability.
+
+## Syntax
+
+`node_id([`*node*`])`
+
+[!INCLUDE [syntax-conventions-note](../includes/syntax-conventions-note.md)]
+
+## Parameters
+
+| Name | Type | Required | Description |
+|---|---|---|---|
+| *node* | `string` |  | The reference to a graph node variable in a graph pattern. <br>Don't pass any parameters when used inside [all()](all-graph-function.md), [any()](any-graph-function.md), and [map()](map-graph-function.md) graph functions, with [inner_nodes()](inner-nodes-graph-function.md).|
+
+## Returns
+
+Returns the node ID string representation of the input node or of all inner nodes, when used inside [all()](all-graph-function.md), [any()](any-graph-function.md), and [map()](map-graph-function.md) functions with [inner_nodes()](inner-nodes-graph-function.md).
+
+## Example
+
+The following example creates a graph to analyze a hierarchical structure of employees and their managers. 
+
+:::moniker range="azure-data-explorer"
+> [!div class="nextstepaction"]
+> <a href="https://dataexplorer.azure.com/clusters/help/databases/Samples?query=H4sIAAAAAAAAA1WQ22rDMAyG7%2F0UwlfxiAtJLwYdK2ylT1FKcRORuPMJx7QM9vBTDs5W%2B0aW9X%2B%2FJIMJ0AbjvxEHeIdWJbpXg4VTFndDitp1JagOd8a7TrAT4x9GN8hL2NYl45%2F%2BOoYVhcf7mK1fS3Z%2BY4bAEYOP6RmbzVa0VY7ocXlPBjMz%2BzB%2B6KMenjKz1Vw4ui1O7IdwXyi7qEK%2FzgVS7rMNPHTq%2F03sHYyDknDSSKtS08PapZCnBf1SbTbbs9wXC0gwoPPoMSI43%2BJFt38qGJIizeTFj3wqDdHfsEm5kYq2knUZuS6jpk%2BrQqGdw3gZy4Zi6YOKskyIX8puk%2By%2BAQAA" target="_blank">Run the query</a>
+::: moniker-end
+
+```kusto
+let employees = datatable(name:string, age:long)
+[
+"Alice", 32,
+"Bob", 31,
+"Eve", 27,
+];
+let reports = datatable(employee:string, manager:string)
+[
+"Bob", "Alice",
+"Chris", "Alice",
+"Eve", "Bob",
+];
+reports
+| make-graph employee --> manager with employees on name
+| graph-match (employee)-[reports*1..3]->(manager)
+    where node_id(employee) startswith "E"
+    project manager1 = node_id(manager), manager2 = map(inner_nodes(reports), node_id())
+```
+
+**Output**
+
+| manager_1 | manager_2 |
+|--|--|
+| Bob | [] |
+| Alice | ["Bob"]
+
+
+## Related content
+
+* [Graph overview](graph-semantics-overview.md)
+* [Graph operators](graph-operators.md)
+* [graph-match operator](graph-match-operator.md)
+* [node-degree-out](node-degree-out.md)
+* [any()](any-graph-function.md)
+* [map()](map-graph-function.md)
diff --git a/data-explorer/kusto/query/toc.yml b/data-explorer/kusto/query/toc.yml
index 15aafb26ea..0c4ef2a575 100644
--- a/data-explorer/kusto/query/toc.yml
+++ b/data-explorer/kusto/query/toc.yml
@@ -1325,6 +1325,9 @@ items:
               - name: node_degree_out()
                 displayName: graph, node, Node degree out node_degree_out, outdegree node_degree_out
                 href: node-degree-out.md
+              - name: node_id()
+                displayName: graph, node, Node Id
+                href: node-id.md
       - name: Visualization
         items:
           - name: Overview