AWS documentdb documentation change

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

File: documentdb/latest/developerguide/toLower.md

Summary

Added new documentation page for the $toLower operator in Amazon DocumentDB, including syntax, parameters, examples in MongoDB Shell, Node.js, and Python with connection examples.

Security assessment

This change adds routine documentation for a string manipulation operator ($toLower). The code examples include standard TLS connection parameters (tls=true, tlsCAFile) which are security best practices for DocumentDB connections, but this is standard documentation for a non-security feature. No evidence of addressing a specific security vulnerability or incident.

Diff

diff --git a/documentdb/latest/developerguide/toLower.md b/documentdb/latest/developerguide/toLower.md
index 8b1378917..a0bef96fa 100644
--- a//documentdb/latest/developerguide/toLower.md
+++ b//documentdb/latest/developerguide/toLower.md
@@ -0,0 +1 @@
+[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#toLower "Open PDF")
@@ -1,0 +3,109 @@
+[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html)
+
+Example (MongoDB Shell)Code examples
+
+# $toLower
+
+The `$toLower` operator in Amazon DocumentDB is used to convert a string to lowercase.
+
+**Parameters**
+
+  * `expression`: The string expression to convert to lowercase.
+
+
+
+
+## Example (MongoDB Shell)
+
+The following example demonstrates how to use the `$toLower` operator to convert the `Desk` field to lowercase.
+
+**Create sample documents**
+    
+    
+    db.locations.insertMany([
+      { "_id": 1, "Desk": "Düsseldorf-BVV-021" },
+      { "_id": 2, "Desk": "Munich-HGG-32a" }
+    ]);
+
+**Query example**
+    
+    
+    db.locations.aggregate([
+      { $project: { item: { $toLower: "$Desk" } } }
+    ]);
+
+**Output**
+    
+    
+    { "_id" : 1, "item" : "düsseldorf-bvv-021" }
+    { "_id" : 2, "item" : "munich-hgg-32a" }
+
+## Code examples
+
+To view a code example for using the `$toLower` command, choose the tab for the language that you want to use:
+
+Node.js
+    
+    
+    
+    const { MongoClient } = require("mongodb");
+    
+    async function main() {
+      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("locations");
+    
+      const result = await collection.aggregate([
+        { $project: { item: { $toLower: "$Desk" } } }
+      ]).toArray();
+    
+      console.log(result);
+    
+      await client.close();
+    }
+    
+    main();
+
+Python
+    
+    
+    
+    from pymongo import MongoClient
+    
+    def main():
+        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["locations"]
+    
+        result = list(collection.aggregate([
+            { "$project": { "item": { "$toLower": "$Desk" } } }
+        ]))
+    
+        print(result)
+    
+        client.close()
+    
+    if __name__ == "__main__":
+        main()
+
+![Warning](https://d1ge0kk1l5kms0.cloudfront.net/images/G/01/webservices/console/warning.png) **Javascript is disabled or is unavailable in your browser.**
+
+To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions.
+
+[Document Conventions](/general/latest/gr/docconventions.html)
+
+$toLong
+
+$toObjectId
+
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+
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+
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+
+Did this page help you? - No
+
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+
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