keen-node.js

// install the 'request' package first with 'npm install request'
var request = require('request');

// replace with your Keen IO project token
var projectToken = "501999234-FAKE-PROJECT-ID";

// create a sample JSON event for an event collection
var eventCollection = "meals";
var sampleEvent = {
  username: "ralph",
  food: "pizza"
};

// calculate the API URL
var apiUrl = "https://api.keen.io/3.0/projects/" + projectToken + "/events/" + eventCollection;

// perform a POST to the API using the request package
request({
  uri: apiUrl,
  method: "POST",
  json: sampleEvent
}, function(error, response, body) {
  // response will be { "created": true } if successful
  // console.log(body);
});