Simple Node.js Application for YugabyteDB

This application connects to your YugabyteDB instance via the node-postgres module and performs basic SQL operations. The instructions below are provided for YugabyteDB Aeon deployments. If you use a different type of deployment, then update the sample-app.js file with proper connection parameters.

Prerequisites

• The latest version of Node.js.
• Command line tool or your favourite IDE, such as Visual Studio Code.

Start YugabyteDB Aeon Cluster

• Start YugabyteDB Aeon instance. You can use the free tier at no cost.
• Add an IP address of your machine/laptop to the IP allow list

Clone Application Repository

Clone the repository and change dirs into it:

git clone https://github.com/YugabyteDB-Samples/yugabyte-simple-node-app.git && cd yugabyte-simple-node-app

Provide Cluster Connection Parameters

Open the sample-app.js file and edit the following configuration parameters:

• host - the hostname of your instance.
• port - the port number of the instance (the default is 5433).
• user - the username for your instance.
• password - the database password.
• ssl.ca - a full path to your CA root cert. Replace the path_to_your_root_certificate placeholder with a path to your certificate (for example, /Users/dmagda/certificates/root.crt).

Note, you can easily find all the settings on the YugabyteDB Aeon dashboard:

Run the Application

1. Install the node-postgres driver:

   npm install pg

2. Install the async utility:

   npm install --save async

3. Run the application:

   node sample-app.js

Upon successful execution, you will see output similar to the following:

>>>> Connecting to YugabyteDB!
>>>> Connected to YugabyteDB!
>>>> Successfully created table DemoAccount.
>>>> Selecting accounts:
name = Jessica, age = 28, country = USA, balance = 10000
name = John, age = 28, country = Canada, balance = 9000
>>>> Transferred 800 between accounts.
>>>> Selecting accounts:
name = Jessica, age = 28, country = USA, balance = 9200
name = John, age = 28, country = Canada, balance = 9800

Explore Application Logic

Congrats! You've successfully executed a simple Node.js app that works with YugabyteDB.

Now, explore the source code of sample-app.js:

1. connect function - establishes a connection with your cloud instance via the node-postgres driver.
2. createDatabase function - creates a table and populates it with sample data.
3. selectAccounts function - queries the data with SQL SELECT statements.
4. transferMoneyBetweenAccounts function - updates records consistently with distributed transactions.

Questions or Issues?

Having issues running this application or want to learn more from Yugabyte experts?

Join our Slack channel, or raise a question on StackOverflow and tag the question with yugabytedb!