_NodeFeatureFlags.md

Backend Feature Flags in NodeJS

1. Create an Optimizely Account
2. Create a ExpressJS Application
3. Follow the Optimizely Node Quickstart

Requirements: Node >= 8.1 and npm >= 5.6

optimizely.js

const optimizelySDK = require('@optimizely/optimizely-sdk');

optimizelySDK.setLogLevel('info');
optimizelySDK.setLogger(optimizelySDK.logging.createLogger())

const optimizelyClientInstance = optimizelySDK.createInstance({
  sdkKey: 'gz2y11nXJN2YF3kD4ifK5',
  datafileOptions: {
    autoUpdate: true,
    updateInterval: 1000,  // 1 second in milliseconds
  },
});


module.exports = optimizelyClientInstance;

routes_index.js

var express = require('express');
var router = express.Router();
const optimizelyClientInstance = require('../optimizely.js');


/* GET home page. */
router.get('/', function(req, res, next) {
  const enabled = optimizelyClientInstance.isFeatureEnabled('hello_world', 'user123');
  const title = enabled
    ? 'Feature flag is on!'
    : 'Feature flag is off!'
  res.render('index', { title: title });
});

module.exports = router;