index.js

const express = require("express"),
    redis = require("redis"),
    bodyParser = require("body-parser"),
    logger = require("morgan"),
    app = express();

// App configurations
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(logger("dev"));

const redisOptions = {
    host: "localhost",
    port: 6379
};

const client = redis.createClient(redisOptions);

client.on("connect", function () {
    console.log("Redis is ready :)");
});

//Storing Strings
app.post("/storeString", function (req, res) {
    client.set("name", req.body.name, function (err, reply) {
        if (err) return res.status(500).send(err);
        return res.status(200).send(reply);
    });
});

// Get stored string
app.get("/storedString/:value", function (req, res) {
    // For example localhost:3000/storedString/name
    client.get(req.params.value, function (err, reply) {
        if (err) return res.status(500).send(err);
        return res.status(200).send(reply);
    });
});

// Storing hash
app.post("/storeHash", function (req, res) {
    client.hmset("hashSetName", "name", req.body.name, "lastname", req.body.lastname, "location", req.body.location, function (err, reply) {
        if(err) return res.status(500).send(err);
        return res.status(200).send(reply);
    });
});

// Get Stored Hash
app.get("/storedHash/:hashSetName", function(req,res){
    const hasthSetName = req.param("hashSetName");
    client.hgetall(hasthSetName, function(err,reply){
        if(err) return res.status(500).json(err);
        else return res.status(200).json(reply);
    });
});

// Storing List
app.post("/storeList", function(req,res){
    client.rpush(["list", "name", req.body.tech1, req.body.tech2, req.body.tech3], function(err,reply){
        if(err) return res.status(500).json(err);
        // It will return 3
        return res.status(200).json(reply);
    });
});

// Get stored list
app.post("/StoredList", function(req,res){
    client.lrange(req.body.listName, req.body.start, req.body.stop , function(err,reply){
        if(err) return res.status(500).json(err);
        return res.status(200).json(reply);
    });
});

// Stroing Sets
app.post("/storeSet", function(req,res){
    client.sadd(["setName", req.body.tech1, req.body.tech2, req.body.tech3], function(err,reply){
        if(err) return res.status(500).json(err);
        return res.status(200).json(reply);
    });
});

// Get Strored Set
app.get("/storedSet/:setName", function(req,res){
    client.smembers(req.param("setName"),function(err,reply){
        if(err) return res.status(500).json(err);
        return res.status(200).json(reply);
    });
});

// Increment a value
app.post("/increment",function(req,res){
    // First add a value
    let watch = {};
    client.set("value", req.body.value,function(err,reply){
        watch.before = req.body.value;
        if(err) console.log(err)
        else{
            // Then increment value
            client.incr("value", function(err,reply){
                if(err) return res.status(500).json(err);
                // Then get incremented value
                client.get("value", function(err,reply){
                    if(err) return console.log("2; " + err)
                    watch.after = reply;
                    return res.status(200).json(watch);
                });
            });
        }
    });
});

// Check Exists a value
app.post("/checkExist", function(req,res){
    client.exists(req.body.value, function(err,reply){
        if(reply === 1) return res.status(200).json("exists");
        return res.status(404).json("not found");
    });
});

app.listen(3000, function () {
    console.log("app listening on port 3000");
});