Connect with NodeJS

This example connects to PostgreSQL® service from NodeJS, making use of the pg package.

Variables

These are the placeholders you will need to replace in the code sample:

Variable

Description

POSTGRESQL_URI

URL for PostgreSQL connection, from the service overview page

Pre-requisites

For this example you will need:

  • The npm pg package:

    npm install pg --save
    
  • Download a CA certificate from the service overview page, this example assumes it is in a local file called ca.pem.

Code

Add the following to index.js and replace the placeholder with the PostgreSQL URI:

const fs = require('fs');
const pg = require('pg');

const postgresqlUri = "POSTGRESQL_URI";

const conn = new URL(postgresqlUri);
conn.search = conn.query = "";

const config = {
    connectionString: conn.href,
    ssl: {
        rejectUnauthorized: true,
        ca: fs.readFileSync('./ca.pem').toString(),
    },
};

const client = new pg.Client(config);
client.connect(function (err) {
    if (err)
        throw err;
    client.query("SELECT VERSION()", [], function (err, result) {
        if (err)
            throw err;

        console.log(result.rows[0]);
        client.end(function (err) {
            if (err)
                throw err;
        });
    });
});

This code creates a PostgreSQL client and opens a connection to the database. Then runs a query checking the database version and prints the response.

Note

This example removes ?sslmode=require from the URL string to avoid running into this bug. Adding the rejectUnauthorized: true configuration ensures that the certificate is checked.

To run the code:

node index.js

If the script runs successfully, the outputs should be the PostgreSQL version running in your service like:

PostgreSQL 13.3 on x86_64-pc-linux-gnu, compiled by gcc, a 68c5366192 p 6520304dc1, 64-bit