Connect an application

Install the Yugabyte Node.js Driver for YCQL

To install the YugabyteDB Node.js driver for YCQL, run the following command:

$ npm install yb-ycql-driver

Create the sample Node.js application


This tutorial assumes that you have:

  • installed YugabyteDB and created a cluster. Refer to Quick start.
  • installed a recent version of Node.js.
  • installed the async utility to work with asynchronous Javascript.

To install the async utility, run the following command:

$ npm install --save async

Write the sample Node.js application

Create a file yb-cql-helloworld.js and add the following content to it.

const ycql = require('yb-ycql-driver');
const async = require('async');
const assert = require('assert');

// Create a YB CQL client.
// DataStax Nodejs 4.0 loadbalancing default is TokenAwarePolicy with child DCAwareRoundRobinPolicy
// Need to provide localDataCenter option below or switch to RoundRobinPolicy
const loadBalancingPolicy = new ycql.policies.loadBalancing.RoundRobinPolicy ();
const client = new ycql.Client({ contactPoints: [''], policies : { loadBalancing : loadBalancingPolicy }});

  function connect(next) {
  function createKeyspace(next) {
    console.log('Creating keyspace ybdemo');
    client.execute('CREATE KEYSPACE IF NOT EXISTS ybdemo;', next);
  function createTable(next) {
    // The create table statement.
    const create_table = 'CREATE TABLE IF NOT EXISTS ybdemo.employee (id int PRIMARY KEY, ' +
                                                                     'name varchar, ' +
                                                                     'age int, ' +
                                                                     'language varchar, ' +
                                                                     'location jsonb);';
    // Create the table.
    console.log('Creating table employee');
    client.execute(create_table, next);
  function insert(next) {
    // Create a variable with the insert statement.
    const insert = "INSERT INTO ybdemo.employee (id, name, age, language, location) " +
                                        "VALUES (1, 'John', 35, 'NodeJS', '{ \"city\": \"San Francisco\", \"state\": \"California\", \"lat\": 37.77, \"long\": 122.42 }');";
    // Insert a row with the employee data.
    console.log('Inserting row with: %s', insert)
    client.execute(insert, next);
  function select(next) {

    // Query the row for employee id 1 and print the results to the console.
    const select = 'SELECT name, age, language, location FROM ybdemo.employee WHERE id = 1;';
    client.execute(select, function (err, result) {
      if (err) return next(err);
      var row = result.first();
      const city =;
      console.log('Query for id=1 returned: name=%s, age=%d, language=%s, city=%s',
                                  , row.age, row.language, city);
], function (err) {
  if (err) {
    console.error('There was an error', err.message, err.stack);
  console.log('Shutting down');

Run the application

To use the application, run the following command:

$ node yb-cql-helloworld.js

You should see the following output.

Creating keyspace ybdemo
Creating table employee
Inserting row with: INSERT INTO ybdemo.employee (id, name, age, language) VALUES (1, 'John', 35, 'NodeJS');
Query for id=1 returned: name=John, age=35, language=NodeJS
Shutting down