Redis Redis works on deployment , It doesn't work on production with docker and heroku

I am trying to develop an express api.It works on local machine as expected. I am using docker but on production with docker and heroku redis is not working

Dockerfile

FROM node:latest 
WORKDIR /usr/src/app  
COPY package*.json ./  
RUN npm install   
COPY . .  
EXPOSE 5000  
CMD ["npm","start"] 

docker.compose.yml file

version: '3' 
services:    
    mongo:     
        container_name: mongo    
        image: mongo       
        ports:       
          - '27017:27017' 
    redis:     
        container_name: redis    
        image: redis         
    app:     
        container_name: password-manager-docker     
        image: app     
        restart: always     
        build: .          
        ports:       
          - '80:5000' 
        links:        
           - mongo       
           - redis     
        environment:
            REDIS_PORT: ${REDIS_PORT}
            MONGODB_URI: ${MONGODB_URI}      
            clientID: ${clientID}
            REDIS_URL: ${REDIS_URL}   
            clientSecret : ${clientSecret}       
            PORT: ${PORT}       
            REDIS_HOST: ${REDIS_HOST}       
            JWT_SECRET_KEY: ${JWT_SECRET_KEY}       
            JWT_EXPIRE: ${JWT_EXPIRE}       
            REFRESH_TOKEN: ${REFRESH_TOKEN}       
            JWT_REFRESH_SECRET_KEY: ${JWT_REFRESH_SECRET_KEY}       
            JWT_REFRESH_EXPIRE: ${JWT_REFRESH_EXPIRE}       
            JWT_COOKIE: ${JWT_COOKIE}       
            SMTP_HOST: ${SMTP_HOST}       
            SMTP_PORT: ${SMTP_PORT}       
            SMTP_USER: ${SMTP_USER}       
            SMTP_PASS: ${SMTP_PASS} 

redis file

const asyncRedis = require('async-redis'); 
//process.env.REDIS_HOST's value is redis 
const redisClient = asyncRedis.createClient({port:process.env.REDIS_PORT,host:process.env.REDIS_HOST || "127.0.0.1"}); 
redisClient.on("connect",() => {   console.log(`Redis: ${host}:${port}`); }) 
redisClient.on('error', function(err) {console.log(`[Redis] Error ${err}`); });

I've already set REDIS_HOST variable as redis in .env file. The error on heroku is " Error: Redis connection to redis:6379 failed - getaddrinfo ENOTFOUND redis ". It worked without docker on heroku but now It is not working. Thanks for your help

Comment From: filipecosta90

@ogulcankarayel5 as seen above there is no issue related to redis on the logs ( this is a matter of using the proper env variables for reaching your redis host in production ). I suggest you ask for examples on https://github.com/moaxaca/async-redis repo and/or the community links, and we close this issue here.