Redis use as Caching Server with Nodejs

configure redis with nodejs

var redis = require('redis');
var port = 6379;
var host = "127.0.0.1";
global.redisClient = null;
redisClient = redis.createClient(port, host);
redisClient.on('connect', function(err, reply) {
    if (err) {
        Logger.info("Error with connection with redis");

    } else {
        Logger.info("connected with redis");
    }
});

set redis key

var data={ tranHash:tx_result,confirm:0 };
redisClient.set(requestid,JSON.stringify(data), function(err,object){
if(err){ console.log("adding set Error"); }
  else{ console.log("Added succesfully set"); }
});

get redis key

redisClient.get(requestid, function(err, object) {
if(err){ console.log("Getting Set Error"); }
else{ console.log("----Retrieving SET--"); object=JSON.parse(object); console.log(object);
});

retrive all keys of redis

redisClient.multi()
.keys('*', function (err, replies) {
console.log("MULTI got " + replies.length + " replies");
replies.forEach(function (reply, index) {
console.log("Reply " + index + ": " + reply.toString());
});
}).exec(function (err, replies) {});

checking for redis key exist or not, save it if key is not stored otherwise access data by redis key(requestid)

  var requestid = req.params.requestid;
  redisClient.get(requestid, (err, object)=> {
  if (err) {
    console.log("Getting Set Error");
  } else {
  console.log("----Retrieving SET--");
  object = JSON.parse(object);
  console.log(object, typeof object);
 if(object.confirm>=2){
      resData.totalConfirmations = object.confirm;
          callback(null,resData);
   }else {
  this.checkConfirmation(object.tranHash,(err,confirm) =>{
  if(err){
       callback(err,err);
  }else {
  var data={ tranHash:object.tranHash,confirm:confirm.totalConfirmations };
  redisClient.set(requestid,JSON.stringify(data), (err,object) => {
  if(err){ console.log("adding set Error"); }
  else{ console.log("Added succesfully set"); console.log(object);
   callback(null,confirm);
  }
  });
  }
}); }
console.log("---End Retriving SET");
}
});

I hope this will be helpful

Thanks