AWS documentdb documentation change

Service: documentdb · 2026-03-31 · Documentation low

File: documentdb/latest/developerguide/ifNull.md

Summary

Added new documentation page for the $ifNull operator in Amazon DocumentDB, including operator description, parameters, MongoDB shell example, and code examples in Node.js and Python.

Security assessment

This change adds standard documentation for a MongoDB aggregation operator ($ifNull) with no mention of security vulnerabilities, patches, or security incidents. The code examples include standard TLS connection parameters (tls=true, tlsCAFile) which are routine secure connection practices, not new security features. The change appears to be routine feature documentation addition.

Diff

diff --git a/documentdb/latest/developerguide/ifNull.md b/documentdb/latest/developerguide/ifNull.md
index 8b1378917..89f746851 100644
--- a//documentdb/latest/developerguide/ifNull.md
+++ b//documentdb/latest/developerguide/ifNull.md
@@ -0,0 +1 @@
+[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#ifNull "Open PDF")
@@ -1,0 +3,140 @@
+[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html)
+
+Example (MongoDB Shell)Code examples
+
+# $ifNull
+
+The `$ifNull` operator is used to return a specified value if the input expression evaluates to null or undefined. This operator can be useful in scenarios where you want to provide a default value or handle null/undefined cases.
+
+**Parameters**
+
+  * `expression`: The expression to evaluate.
+
+  * `replacement`: The value to return if the `<expression>` evaluates to null or undefined.
+
+
+
+
+## Example (MongoDB Shell)
+
+The following example demonstrates the usage of the `$ifNull` operator to provide a default value when the `name` field is null or undefined.
+
+**Create sample documents**
+    
+    
+    db.users.insertMany([
+      { _id: 1, name: "John" },
+      { _id: 2, name: null },
+      { _id: 3 }
+    ]);
+
+**Query example**
+    
+    
+    db.users.aggregate([
+      {
+        $project: {
+          _id: 1,
+          name: { $ifNull: ["$name", "No Name"] }
+        }
+      }
+    ]);
+
+**Output**
+    
+    
+    [
+      { "_id": 1, "name": "John" },
+      { "_id": 2, "name": "No Name" },
+      { "_id": 3, "name": "No Name" }
+    ]
+
+## Code examples
+
+To view a code example for using the `$ifNull` command, choose the tab for the language that you want to use:
+
+Node.js
+    
+    
+    
+    const { MongoClient } = require('mongodb');
+    
+    async function example() {
+      const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
+    
+      const db = client.db('test');
+    
+      const collection = db.collection('users');
+    
+      const pipeline = [
+        {
+          $project: {
+            _id: 1,
+            name: { $ifNull: ["$name", "No Name"] }
+          }
+        }
+      ];
+    
+      const cursor = await collection.aggregate(pipeline);
+    
+      await cursor.forEach(doc => {
+        console.log(doc);
+      });
+    
+      await client.close();
+    
+    }
+    
+    example();
+
+Python
+    
+    
+    
+    from pymongo import MongoClient
+    
+    def example():
+        client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
+        
+        db = client.test
+        collection = db.users
+    
+        pipeline = [
+            {
+                "$project": {
+                    "_id": 1,
+                    "name": { "$ifNull": ["$name", "No Name"] }
+                }
+            }
+        ]
+    
+        result = collection.aggregate(pipeline)
+    
+        for doc in result:
+            print(doc)
+    
+        client.close()
+    
+    example()
+
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+
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+
+[Document Conventions](/general/latest/gr/docconventions.html)
+
+$hour
+
+$in
+
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