AWS documentdb documentation change

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

File: documentdb/latest/developerguide/toObjectId.md

Summary

Added new documentation page for the $toObjectId operator in Amazon DocumentDB (new from version 4.0), including syntax, parameters, examples in MongoDB Shell, Node.js, and Python with connection examples.

Security assessment

This change adds routine documentation for a data type conversion operator ($toObjectId). The code examples include standard TLS connection parameters which are security best practices, but this is standard feature documentation. No evidence of addressing a specific security vulnerability or incident. The operator itself converts string representations to ObjectId data type for data consistency, not for security purposes.

Diff

diff --git a/documentdb/latest/developerguide/toObjectId.md b/documentdb/latest/developerguide/toObjectId.md
index 8b1378917..7245c42e9 100644
--- a//documentdb/latest/developerguide/toObjectId.md
+++ b//documentdb/latest/developerguide/toObjectId.md
@@ -0,0 +1 @@
+[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#toObjectId "Open PDF")
@@ -1,0 +3,116 @@
+[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html)
+
+Example (MongoDB Shell)Code examples
+
+# $toObjectId
+
+New from version 4.0
+
+The `$toObjectId` operator in Amazon DocumentDB is used to convert a string representation of an ObjectId to an actual ObjectId data type. This can be useful when working with data that has been stored as string representations of ObjectIds, as it allows you to perform operations that require the ObjectId data type.
+
+**Parameters**
+
+  * `expression`: A string expression representing a valid ObjectId.
+
+
+
+
+## Example (MongoDB Shell)
+
+The following example demonstrates how to use the `$toObjectId` operator to convert a string representation of an ObjectId to the ObjectId data type.
+
+**Create sample documents**
+    
+    
+    db.employees.insertMany([
+      { _id: 1, empId:"64e5f8886218c620cf0e8f8a", name: "Carol Smith", employeeId: "c720a" },
+      { _id: 2, empId:"64e5f94e6218c620cf0e8f8c", name: "Bill Taylor", employeeId: "c721a" }
+    ]);
+
+**Query example**
+    
+    
+    db.employees.aggregate([
+      { $project: {
+        "empIdAsObjectId": {$toObjectId: "$empId"}}
+      }
+    ]);
+
+**Output**
+    
+    
+    [
+      { _id: 1, empIdAsObjectId: ObjectId('64e5f8886218c620cf0e8f8a') },
+      { _id: 2, empIdAsObjectId: ObjectId('64e5f94e6218c620cf0e8f8c') }
+    ]
+
+## Code examples
+
+To view a code example for using the `$toObjectId` 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('employees');
+    
+      const result = await collection.aggregate([
+        { $project: {
+          "empIdAsObjectId": {$toObjectId: "$empId"}}
+        }
+      ]).toArray();
+    
+      console.log(result);
+      client.close();
+    }
+    
+    example();
+
+Python
+    
+    
+    
+    from pymongo import MongoClient
+    
+    def example():
+        client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
+        db = client['test']
+        collection = db['employees']
+    
+        result = list(collection.aggregate([
+          { "$project": {
+            "empIdAsObjectId": {"$toObjectId": "$empId"}}
+          }
+        ]))
+    
+        print(result)
+        client.close()
+    
+    example()
+
+![Warning](https://d1ge0kk1l5kms0.cloudfront.net/images/G/01/webservices/console/warning.png) **Javascript is disabled or is unavailable in your browser.**
+
+To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions.
+
+[Document Conventions](/general/latest/gr/docconventions.html)
+
+$toLower
+
+$toString
+
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+
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+
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+
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