DOCSP-48378 make mongoclient page (mongodb#1038)

* make mongoclient page

* fix link:

* fix link

* add anchor to page to avoid broken link

* nr feedback

* nb feedback

* monospace

Author: shuangela

source/connect/mongoclient.txt

@@ -18,54 +18,71 @@ Create a MongoClient
    :depth: 2
    :class: singlecol
 
-This guide shows you how to connect to a
-`MongoDB Atlas deployment <https://www.mongodb.com/docs/atlas>`__,
-a MongoDB instance, or a replica set using the Node.js driver.
+Overview
+--------
+
+To connect to a MongoDB deployment, you need two things:
+
+- **Connection URI**, also known as a *connection string*, which tells the
+  {+driver-short+} which MongoDB deployment to connect to.
+- **MongoClient** object, which creates the connection to and performs 
+  operations on the MongoDB deployment.
+
+You can also use ``MongoClientOptions`` to customize the way the {+driver-short+} behaves
+while connected to MongoDB.
+
+This guide shows you how to create a connection string and use a ``MongoClient`` object
+to connect to MongoDB.
 
 .. _node-connection-uri:
 
 Connection URI
 --------------
 
-The **connection URI** is the set of instructions that the driver uses to connect to a
-MongoDB deployment. It tells the driver how to connect to MongoDB and how to behave
-while connected. The following example shows each part of the connection URI:
+A standard connection string includes the following components:
 
-.. figure:: /includes/figures/dns_seedlist_connection_string_parts.png
-   :alt: Each part of the connection string
+.. list-table::
+   :widths: 20 80
+   :header-rows: 1
 
-In this example, we connect to an Atlas MongoDB deployment that has a
-DNS SRV record. For more details, see the
-:manual:`DNS Seed List Connection Format
-</reference/connection-string/#dns-seed-list-connection-format>`
-documentation. This format offers flexibility in deployment and the
-ability to change the servers in rotation without reconfiguring clients.
+   * - Component
+     - Description
 
-.. note::
+   * - ``mongodb://``
+
+     - Required. A prefix that identifies this as a string in the
+       standard connection format.
 
-   To learn how to retrieve your connection string in Atlas, see the
-   :atlas:`Atlas driver connection guide </driver-connection>`.
+   * - ``username:password``
 
-If you are connecting to an instance or replica set that does not have a
-DNS SRV address, you must use ``mongodb`` for the protocol, which specifies
-the :manual:`Standard Connection String Format
-</reference/connection-string/#std-label-connections-standard-connection-string-format>`.
+     - Optional. Authentication credentials. If you include these, the client
+       authenticates the user against the database specified in ``authSource``.
+       For more information about the ``authSource`` connection option, 
+       see :ref:`node-troubleshooting-connection-admin` in the Connection Troubleshooting guide.
 
-After the protocol, the next part of the connection string contains credentials
-if you are using password-based authentication. Replace the value of ``user``
-with your username and ``pass`` with your password. If you are using an
-authentication mechanism that does not require a username and password, omit
-this part of the connection URI.
+   * - ``host[:port]``
 
-The next part of the connection string specifies the hostname or IP address of
-your MongoDB instance, followed by the port number. In the example above, we use
-``sample.host`` as the hostname and ``27017`` as the port. Replace these values
-to point to your MongoDB instance.
+     - Required. The host and optional port number where MongoDB is running. If you don't
+       include the port number, the driver uses the default port, ``27017``.
 
-The last part of the connection string contains connection and authentication
-options as parameters. In the example above, we set two connection options:
-``maxPoolSize=20`` and ``w=majority``. For more information on connection
-options, skip to the :ref:`node-connection-options` section.
+   * - ``/defaultauthdb``
+     
+     - Optional. The authentication database to use if the
+       connection string includes ``username:password@``
+       authentication credentials but not the ``authSource`` option.  
+       When you call ``client.db()`` with no argument, this is the database that is used. If you don't include 
+       this component, the client authenticates the user against the ``admin`` database.
+
+   * - ``?<options>``
+
+     - Optional. A query string that specifies connection-specific
+       options as ``<name>=<value>`` pairs. See
+       :ref:`node-connection-options` for a full description of
+       these options.
+
+For more information about creating a connection string, see
+:manual:`Connection Strings </reference/connection-string>` in the
+MongoDB Server documentation.
 
 .. _connect-sample-node-driver:
 
@@ -81,8 +98,8 @@ URI and a ``MongoClientOptions`` object.
    As each ``MongoClient`` represents a pool of connections to the
    database, most applications only require a single instance of a
    ``MongoClient``, even across multiple requests. To learn more about
-   how connection pools work in the driver, see the :ref:`FAQ page
-   <node-faq-connection-pool>`.
+   how connection pools work in the driver, see the :ref:`Connection Pools page
+   <node-connection-pools>`.
 
 Use the ``serverApi`` option in your ``MongoClientOptions`` object to
 enable the {+stable-api+} feature, which forces the server to run operations
@@ -102,63 +119,13 @@ verify that the connection is successful:
    Call the ``MongoClient.connect()`` method explicitly if you want to verify that the
    connection is successful.
 
-To learn more about the Stable
-API feature, see the :ref:`{+stable-api+} page <nodejs-stable-api>`.
-
-.. _node-other-ways-to-connect:
-
-Other Ways to Connect to MongoDB
---------------------------------
-
-If you are connecting to a single {+mdb-server+} instance or replica set
-that is not hosted on Atlas, see the following sections to find out how to
-connect.
-
-Connect to a {+mdb-server+} on Your Local Machine
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. include:: /includes/localhost-connection.rst
-
-To test whether you can connect to your server, replace the connection
-string in the :ref:`Connect to MongoDB <connect-sample-node-driver>` code
-example and run it.
-
-Connect to a Replica Set
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-A MongoDB replica set deployment is a group of connected instances that
-store the same set of data. This configuration of instances provides data
-redundancy and high data availability.
-
-To connect to a replica set deployment, specify the hostname and port numbers
-of each instance, separated by a comma, and the replica set name as the value
-of the ``replicaSet`` parameter in the connection string.
-
-.. code-block:: none
-
-   mongodb://host1:27017,host2:27017,host3:27017/?replicaSet=myRs
-
-When making a connection, the driver takes the following actions by default:
-
-- Discovers all replica set members when given the address of any one member.
-- Dispatches operations to the appropriate member, such as write against the **primary**.
-
-.. tip:: Specify all hosts
-
-   To ensure connectivity if one host is unavailable, provide the full
-   list of hosts when connecting to a replica set.
+To learn more about the {+stable-api+} feature, see the :ref:`{+stable-api+} page <nodejs-stable-api>`.
 
-Direct Connection
-^^^^^^^^^^^^^^^^^
+API Documentation
+-----------------
 
-To force your operations to run on the host specified in your connection
-URI, you can specify the ``directConnection`` connection option. If you
-specify this option, you must use the standard connection URI format. The
-driver does not accept the DNS seedlist connection format (SRV) when you
-specify this option.
+For more information about creating a ``MongoClient`` object with the 
+{+driver-short+}, see the following API documentation: 
 
-When you specify ``directConnection`` and connect to a secondary member of the
-replica set, your write operations fail because the client isn't
-connected to the primary member. To perform read operations, you must
-enable secondary reads. See the :manual:`read preference options </reference/connection-string/#read-preference-options>`
-for more information.
+- `MongoClient <{+api+}/classes/MongoClient.html>`__
+- `MongoClientOptions <{+api+}/interfaces/MongoClientOptions.html>`__