COOKIE_SECRET=nodebirdsecret
KAKAO_ID=5d4daf57becfd72fd9c919882552c4a6
SEQUELIZE_PASSWORD=[비밀번호]
REDIS_HOST=redis-16721.c14.us-east-1-2.ec2.cloud.redislabs.com
REDIS_PORT=16721
REDIS_PASSWORD=41lL904Z153mw6YkZZd1TDCQkcoZrJXG

...
const hpp = require('hpp');
const redis = require('redis');
const RedisStore = require('connect-redis')(session);

dotenv.config();
const redisClient = redis.createClient({
  url: `redis://${process.env.REDIS_HOST}:${process.env.REDIS_PORT}`,
  password: process.env.REDIS_PASSWORD,
  legacyMode: true,
});
redisClient.connect().catch(console.error);
const pageRouter = require('./routes/page');
...
const sessionOption = {
  resave: false,
  saveUninitialized: false,
  secret: process.env.COOKIE_SECRET,
  cookie: {
    httpOnly: true,
    secure: false,
  },
  store: new RedisStore({ client: redisClient }),
};
...