Query Elasticsearch Data through ODBC in Node.js

Node.js is a JavaScript runtime environment that allows you to run JavaScript code outside of a browser. With the CData ODBC Driver for Elasticsearch, you can access live Elasticsearch data from Node.js apps and scripts. In this article, we walk through installing node-odbc and the required tools to create a simple Node.js app with access to live Elasticsearch data.

With built-in optimized data processing, the CData ODBC Driver offers unmatched performance for interacting with live Elasticsearch data in Node.js. When you issue complex SQL queries from Node.js to Elasticsearch, the driver pushes supported SQL operations, like filters and aggregations, directly to Elasticsearch and utilizes the embedded SQL engine to process unsupported operations client-side (often SQL functions and JOIN operations).

Connecting to Elasticsearch Data

If you have not already done so, provide values for the required connection properties in the data source name (DSN). You can use the built-in Microsoft ODBC Data Source Administrator to configure the DSN. This is also the last step of the driver installation. See the "Getting Started" chapter in the help documentation for a guide to using the Microsoft ODBC Data Source Administrator to create and configure a DSN.

Set the Server and Port connection properties to connect. To authenticate, set the User and Password properties, PKI (public key infrastructure) properties, or both. To use PKI, set the SSLClientCert, SSLClientCertType, SSLClientCertSubject, and SSLClientCertPassword properties.

The data provider uses X-Pack Security for TLS/SSL and authentication. To connect over TLS/SSL, prefix the Server value with 'https://'. Note: TLS/SSL and client authentication must be enabled on X-Pack to use PKI.

Once the data provider is connected, X-Pack will then perform user authentication and grant role permissions based on the realms you have configured.

Building node-odbc

In order to connect to Elasticsearch through the CData ODBC Driver, you need to build node-odbc manually (after installing the required tools).

Installing the Required Tools

The following commands install the tools required to build node-odbc (note the -g parameter, which installs the tools globally).

npm i -g windows-build-tools
npm i -g node-gyp

Building node-odbc

After installing the required tools, create a directory for the Node.js app and install odbc (which builds the binary for us to use in our Node.js script).

mkdir nodeodbc
cd nodeodbc
npm i -g node

Querying Elasticsearch from Node.js

With the ODBC Driver installed, a DSN Configured, and node-odbc built, we are ready to query live Elasticsearch data from a Node.js app. The sample code below connects to a specific DSN and queries the Orders table.

myscript.js

const odbc = require('odbc');

async function queryElasticsearch() {
    const connection = await odbc.connect(`DSN=CData Elasticsearch Source`);
    const data = await connection.query('SELECT OrderName, Freight FROM Orders');
    console.log(data);
}

queryElasticsearch();

Once you write the app, use node to execute the script:

node myscript.js

Download a free, 30-day trial of the CData ODBC Driver for Elasticsearch and start working with your live Elasticsearch data in Node.js. Reach out to our Support Team if you have any questions.