Interested in connecting to a Capella cluster using Node.js?

In this quickstart blog post (and I do mean quick!) I will walk you through the short set of steps to connect to a cluster in Capella with the Couchbase Node.js SDK.

Setup

Requirements

To complete this tutorial, you must have the following:

Install latest long-term support (LTS) release of Node.

Download and install Node’s latest long-term support (LTS) release if you haven’t already.

If you’re installing Node for the first time, we recommend using the Node Version Manager (nvm) for getting started with Node.

  1. Follow the instructions for installing nvm
  2. Install the latest Node LTS release

Create a Node.JS Project

Creating a Node.js project is as easy as making a directory and initializing it with npm. The next two commands will do that for us. Open up a terminal and run the following command:

The command above will make our directory and change our current working directory. The next command initializes the project directory:

If a directory does not already have a package.json at its root, this means it is not initialized. The command above will accomplish this.

Note: We have used the -y flag to take the initialization defaults. To change any of these defaults, just open the package.json and manually make any changes.

Install the Couchbase Node.js SDK

The Couchbase Node.js SDK enables you to interact with a Couchbase Server cluster from the Node.js language. The Couchbase Node.js Client will run on any supported LTS version of Node.js.

To install the latest Couchbase Node.js SDK, run the following command:

Use the –save option to have the Couchbase module added as a dependency to the project. This will help automate the installation of packages if you want to distribute your work in the future.

Connecting to Couchbase with built-in Node.js SDK

After installing the Couchbase SDK, the next step is to use the built-in SDK examples to connect to your cluster.

Find cluster connection settings

Go to the cluster’s Connect tab in the Couchbase Capella UI using these steps:

  • Go to the Clusters tab in the main navigation
  • Find and click on your cluster (docs-cluster13feb1 in the following screenshot). This opens the cluster with its Overview tab selected.
  • Click the Connect tab in the left sidebar

In the Connection section, two endpoints are listed: One labeled Public and one labeled Private.

When connecting to the cluster over a wide area network—such as when you’re connecting to the cluster over the Internet from an application on your laptop—you will use the public endpoint.

When connecting to the cluster from within your cloud provider using a peering connection, you will use the private endpoint.

However, you will not need to copy the public endpoint for this post because it is automatically included in the built-in SDK examples we will use.

Open SDK examples

Click SDK Examples. This opens the SDK Examples fly-out menu, showing the options in this screenshot:

Each of the supported Couchbase SDK languages is represented by a tab. Under each tab, a snippet of the example code is provided. The example code is pre-populated with the cluster’s public endpoint and, with a few modifications, can quickly be used for connecting to the cluster.

Copy the example code.

Click on the tab for your desired SDK language, and copy the example code. If you’re following the examples in this guide, click the Node.js tab, and copy the example JavaScript code.

Paste the example code into a text editor and update your connection details.

The SDK example code automatically comes pre-populated with the cluster’s public endpoint and default bucket name.

Update the username and password connection settings to the database credentials you created when you configured database access earlier.

Changing the bucket (optional)

The bucketName is the name of a bucket on the cluster you will connect to. The example code comes pre-populated with the name of the default bucket: couchbasecloudbucket. This bucket will suffice for this tutorial, but if you choose to create a new bucket for this exercise, you’ll need to specify the new bucket’s name in the example code.

Database credentials must allow access to any new bucket that you add. If you configured the database credential to have read/write permissions on all buckets (as recommended), you can specify any bucket when testing out the connection.

The following is an example of a completed Node.js configuration:

Once you’ve finished updating the example code with your connection details, save it in your project directory. Be sure to use the appropriate file extension for the SDK language.

If you’re following the examples in this guide, save the file as connection-script.js in the node-couchbase-project directory that you created earlier when you installed the Couchbase Node.js SDK.

Connect to the cluster.

From the project directory, run the connection script using the following command:

The results you should expect are as follows:

If you received the results above, the connection was successful, and a document was written to the bucket.

Congratulations on completing this quickstart guide! Be sure to try this out on Couchbase Capella to see how easy it can be.

Resources

Capella

To learn more about Couchbase Capella, our database-as-a-service offering:

Tutorials

The Couchbase Developer Portal has tons of tutorials/quickstart guides and learning paths to help you get started, including:

Training

We have several training options available depending on your need and level:

See the documentation to learn more about the Couchbase SDKs.

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Thank you for reading this post. At this point, you should be able to easily interact with a Couchbase Capella cluster from a Node.js script. If you have any questions or comments, please connect with us on the Couchbase Forums.

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Author

Posted by Vinai Amble

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