Connect Node.js Express.js Project to PostgreSQL Server Database Using Node Postgres

In this article, we will explore how to connect a Node.js Express.js project to a PostgreSQL server database using the Node Postgres library.

Step 1: Install Node Postgres

The first step is to install the Node Postgres library. You can do this by running the following command in your terminal:

      
        npm install pg
      
    

Step 2: Set Up the PostgreSQL Server

Next, you will need to set up a PostgreSQL server. You can do this by installing PostgreSQL on your local machine or using a cloud-based PostgreSQL service. Once you have your PostgreSQL server up and running, you will need to create a database for your Node.js project to connect to.

Step 3: Connect to the PostgreSQL Database in Your Node.js Project

Now that you have Node Postgres installed and your PostgreSQL server set up, you can connect to the database in your Node.js project. Here’s an example of how to do this in your Node.js code:

      
        const { Client } = require('pg');
        
        const client = new Client({
          user: 'your_username',
          host: 'localhost',
          database: 'your_database',
          password: 'your_password',
          port: 5432,
        });
        
        client.connect();
      
    

In the above code, you will need to replace ‘your_username’, ‘localhost’, ‘your_database’, and ‘your_password’ with your actual PostgreSQL server credentials.

Step 4: Perform Database Operations in Your Node.js Project

Once you have connected to the PostgreSQL database in your Node.js project, you can perform various database operations such as querying data, inserting new records, updating existing records, and deleting records. Here’s an example of how to query data from the database:

      
        const { Client } = require('pg');
        
        const client = new Client({
          user: 'your_username',
          host: 'localhost',
          database: 'your_database',
          password: 'your_password',
          port: 5432,
        });
        
        client.connect();
        
        client.query('SELECT * FROM your_table', (err, res) => {
          console.log(res.rows);
          client.end();
        });
      
    

In the above code, you will need to replace ‘your_table’ with the name of the table you want to query from.

Conclusion

By following the steps outlined in this article, you can easily connect your Node.js Express.js project to a PostgreSQL server database using the Node Postgres library. This will allow you to efficiently interact with your database and perform various database operations in your Node.js project.