DOCSP-48379 Connection Targets (#1043)

* DOCSP-48379 Connection Targets

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Author: lindseymoore

source/connect/connection-targets.txt

@@ -15,4 +15,95 @@ Choose a Connection Target
    :local:
    :backlinks: none
    :depth: 2
-   :class: singlecol
+   :class: singlecol
+
+Overview
+--------
+
+In this guide, you can learn how to use a connection string and a ``MongoClient`` 
+object to connect to different types of MongoDB deployments.
+
+.. tip::
+
+   To learn more about how to retrieve your connection string, see 
+   the :atlas:`Connect via Drivers </driver-connection>` guide in 
+   the Atlas documentation.
+
+Atlas
+-----
+
+To connect to a MongoDB deployment on Atlas, include the following elements
+in your connection string:
+
+- URL of your Atlas cluster
+- MongoDB username
+- MongoDB password
+
+Then, pass your connection string to the ``MongoClient`` constructor.
+
+When you connect to Atlas, we recommend using the {+stable-api+} client option to avoid
+breaking changes when Atlas upgrades to a new version of {+mdb-server+}.
+To learn more about the {+stable-api+} feature, see the :ref:`<nodejs-stable-api>`
+guide.
+
+The following code shows how to use the {+driver-short+} to connect to an Atlas cluster. The
+code also uses the ``server_api`` field to specify a {+stable-api+} version.
+
+.. literalinclude:: /includes/connect/connection-targets.js
+   :language: javascript
+   :start-after: start-connection-target-atlas
+   :end-before: end-connection-target-atlas
+   :dedent:
+
+Local Deployments
+-----------------
+
+To connect to a local standalone MongoDB deployment, specify the host of the 
+server. Optionally, specify the port of the server. If no port is specified, 
+the default port is ``27017``. 
+
+You can specify the host and port to connect to by using a  
+connection string, as shown in the following code:
+
+.. literalinclude:: /includes/connect/connection-targets.js
+   :language: javascript
+   :start-after: start-local-connection-uri
+   :end-before: end-local-connection-uri
+   :dedent:
+
+You can also specify your host as ``localhost``. The following code example 
+connects to ``localhost`` on the specified port:
+
+.. literalinclude:: /includes/connect/connection-targets.js
+   :language: javascript
+   :start-after: start-localhost
+   :end-before: end-localhost
+   :dedent:
+
+Replica Sets
+------------
+
+To connect to a replica set, we recommend that you specify all nodes that are 
+part of the replica set. If one or more nodes becomes unavailable,
+specifying all nodes allows the driver to still connect to the replica set 
+if one node is available.
+
+However, it is sufficient to pass the address of any one node in the replica set 
+to the driver. The node does not need to be the primary, and it may be a hidden node. 
+The driver will then automatically discover the remaining nodes.
+
+The following example shows how to connect to the replica set by using a connection
+string and how to verify the replica set name on connection by using the 
+``replicaSet`` connection string option:
+
+.. literalinclude:: /includes/connect/connection-targets.js
+   :language: javascript
+   :start-after: start-replica-set-option
+   :end-before: end-replica-set-option
+   :dedent:
+
+API Documentation
+-----------------
+
+To learn more about creating a ``MongoClient`` object with the {+driver-short+},
+see the API documentation for `MongoClient <{+api+}/classes/MongoClient.html>`__ .

source/includes/connect/connection-targets.js

@@ -0,0 +1,43 @@
+// start-connection-target-atlas
+const { MongoClient, ServerApiVersion } = require("mongodb");
+
+// Replace the placeholder with your Atlas connection string
+const uri = "<connection string>";
+
+// Creates a MongoClient with a MongoClientOptions object to set the Stable API version
+const client = new MongoClient(uri,  {
+        serverApi: {
+            version: ServerApiVersion.v1,
+            strict: true,
+            deprecationErrors: true,
+        }
+    }
+);
+
+async function run() {
+  try {
+    // Connects the client to the server (optional starting in v4.7)
+    await client.connect();
+
+    // Sends a ping to confirm a successful connection
+    await client.db("admin").command({ ping: 1 });
+    console.log("Pinged your deployment. You successfully connected to MongoDB!");
+  } finally {
+    // Ensures that the client will close when you finish/error
+    await client.close();
+  }
+}
+run().catch(console.dir);
+// end-connection-target-atlas
+
+// start-local-connection-uri
+const client = new MongoClient("mongodb://host1:27017");
+// end-local-connection-uri
+
+// start-localhost
+const client = new MongoClient("mongodb://localhost:27017");
+// end-localhost
+
+// start-replica-set-option
+const client = new MongoClient("mongodb://host1:27017,host2:27017,host3:27017/?replicaSet=myRs");
+// end-replica-set-option