sqltest.js

const sql = require('mssql');
/*
    const config = {
        user: 'username', // better stored in an app setting such as process.env.DB_USER
        password: 'password', // better stored in an app setting such as process.env.DB_PASSWORD
        server: 'your_server.database.windows.net', // better stored in an app setting such as process.env.DB_SERVER
        port: 1433, // optional, defaults to 1433, better stored in an app setting such as process.env.DB_PORT
        database: 'AdventureWorksLT', // better stored in an app setting such as process.env.DB_NAME
        authentication: {
            type: 'default'
        },
        options: {
            encrypt: true
        }
    }
*/
/*
    //Use Azure VM Managed Identity to connect to the SQL database
    const config = {
        server: process.env["db_server"],
        port: process.env["db_port"],
        database: process.env["db_database"],
        authentication: {
            type: 'azure-active-directory-msi-vm'
        },
        options: {
            encrypt: true
        }
    }

    //Use Azure App Service Managed Identity to connect to the SQL database
    const config = {
        server: process.env["db_server"],
        port: process.env["db_port"],
        database: process.env["db_database"],
        authentication: {
            type: 'azure-active-directory-msi-app-service'
        },
        options: {
            encrypt: true
        }
    }
*/

console.log("Starting...");
connectAndQuery();

async function connectAndQuery() {
    try {
        var poolConnection = await sql.connect(config);

        console.log("Reading rows from the Table...");
        var resultSet = await poolConnection.request().query(`SELECT TOP 20 pc.Name as CategoryName,
            p.name as ProductName 
            FROM [SalesLT].[ProductCategory] pc
            JOIN [SalesLT].[Product] p ON pc.productcategoryid = p.productcategoryid`);

        console.log(`${resultSet.recordset.length} rows returned.`);

        // output column headers
        var columns = "";
        for (var column in resultSet.recordset.columns) {
            columns += column + ", ";
        }
        console.log("%s\t", columns.substring(0, columns.length - 2));

        // ouput row contents from default record set
        resultSet.recordset.forEach(row => {
            console.log("%s\t%s", row.CategoryName, row.ProductName);
        });

        // close connection only when we're certain application is finished
        poolConnection.close();
    } catch (err) {
        console.error(err.message);
    }
}