├── .gitignore ├── Redis ├── data-structures.js ├── io-redis.js ├── package-lock.json ├── package.json ├── pub-sub.js └── server.js ├── express-concepts ├── config │ └── corsConfig.js ├── middleware │ ├── apiVersioning.js │ ├── customMiddleware.js │ ├── errorHandler.js │ └── rateLimiting.js ├── package-lock.json ├── package.json ├── routes │ └── item-routes.js └── server.js └── node-concepts ├── buffer-demo.js ├── event-loop.js ├── input.txt ├── output.txt.gz.enc └── streams-demo.js /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | .env -------------------------------------------------------------------------------- /Redis/data-structures.js: -------------------------------------------------------------------------------- 1 | const redis = require("redis"); 2 | 3 | const client = redis.createClient({ 4 | host: "localhost", 5 | port: 6379, 6 | }); 7 | 8 | //event listener 9 | 10 | client.on("error", (error) => 11 | console.log("Redis client error occured!", error) 12 | ); 13 | 14 | async function redisDataStructures() { 15 | try { 16 | await client.connect(); 17 | // Strings -> SET, GET, MSET, MGET 18 | 19 | // await client.set("user:name", "Sangam Mukherjee"); 20 | // const name = await client.get("user:name"); 21 | // console.log(name); 22 | 23 | // await client.mSet([ 24 | // "user:email", 25 | // "sangam@gmail.com", 26 | // "user:age", 27 | // "60", 28 | // "user:country", 29 | // "India", 30 | // ]); 31 | // const [email, age, country] = await client.mGet([ 32 | // "user:email", 33 | // "user:age", 34 | // "user:country", 35 | // ]); 36 | 37 | // console.log(email, age, country); 38 | 39 | // lists -> LPUSH, RPUSH, LRANGE, LPOP, RPOP 40 | 41 | // await client.lPush("notes", ["note 1", "note 2", "note 3"]); 42 | // const extractAllNotes = await client.lRange("notes", 0, -1); 43 | // console.log(extractAllNotes); 44 | 45 | // const firstNote = await client.lPop("notes"); 46 | // console.log(firstNote); 47 | 48 | // const remainingNotes = await client.lRange("notes", 0, -1); 49 | // console.log(remainingNotes, "remainingNotes"); 50 | 51 | // sets -> SADD, SMEMBERS, SISMEMBER, SREM 52 | // await client.sAdd("user:nickName", ["john", "varun", "xyz"]); 53 | // const extractUserNicknames = await client.sMembers("user:nickName"); 54 | 55 | // console.log(extractUserNicknames); 56 | 57 | // const isVarunIsOneOfUserNickName = await client.sIsMember( 58 | // "user:nickName", 59 | // "varun" 60 | // ); 61 | // console.log(isVarunIsOneOfUserNickName); 62 | 63 | // await client.sRem("user:nickName", "xyz"); 64 | 65 | // const getUpdatedUserNickNames = await client.sMembers("user:nickName"); 66 | // console.log(getUpdatedUserNickNames); 67 | 68 | //sorted sets 69 | // ZADD, ZRANGE, ZRANK, ZREM 70 | 71 | // await client.zAdd("cart", [ 72 | // { 73 | // score: 100, 74 | // value: "Cart 1", 75 | // }, 76 | // { 77 | // score: 150, 78 | // value: "Cart 2", 79 | // }, 80 | // { 81 | // score: 10, 82 | // value: "Cart 3", 83 | // }, 84 | // ]); 85 | 86 | // const getCartItems = await client.zRange("cart", 0, -1); 87 | // console.log(getCartItems); 88 | 89 | // const extractAllCartItemsWithScore = await client.zRangeWithScores( 90 | // "cart", 91 | // 0, 92 | // -1 93 | // ); 94 | // console.log(extractAllCartItemsWithScore); 95 | 96 | // const cartTwoRank = await client.zRank("cart", "Cart 2"); 97 | // console.log(cartTwoRank); 98 | 99 | //hashes -> HSET, HGET, HGETALL, HDEL 100 | 101 | await client.hSet("product:1", { 102 | name: "Product 1", 103 | description: "product one description", 104 | rating: "5", 105 | }); 106 | 107 | const getProductRating = await client.hGet("product:1", "rating"); 108 | console.log(getProductRating); 109 | 110 | const getProductDetails = await client.hGetAll("product:1"); 111 | console.log(getProductDetails); 112 | 113 | await client.hDel("product:1", "rating"); 114 | 115 | const updatedProductDetails = await client.hGetAll("product:1"); 116 | console.log(updatedProductDetails); 117 | } catch (e) { 118 | console.error(e); 119 | } finally { 120 | client.quit(); 121 | } 122 | } 123 | 124 | redisDataStructures(); 125 | -------------------------------------------------------------------------------- /Redis/io-redis.js: -------------------------------------------------------------------------------- 1 | const Redis = require("ioredis"); 2 | //redis client library for node js 3 | 4 | const redis = new Redis(); 5 | 6 | async function ioRedisDemo() { 7 | try { 8 | await redis.set("key", "value"); 9 | const val = await redis.get("key"); 10 | console.log(val); 11 | } catch (e) { 12 | console.error(e); 13 | } finally { 14 | redis.quit(); 15 | } 16 | } 17 | 18 | ioRedisDemo(); 19 | -------------------------------------------------------------------------------- /Redis/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "redis", 3 | 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"https://registry.npmjs.org/standard-as-callback/-/standard-as-callback-2.1.0.tgz", 187 | "integrity": "sha512-qoRRSyROncaz1z0mvYqIE4lCd9p2R90i6GxW3uZv5ucSu8tU7B5HXUP1gG8pVZsYNVaXjk8ClXHPttLyxAL48A==" 188 | }, 189 | "node_modules/yallist": { 190 | "version": "4.0.0", 191 | "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz", 192 | "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==" 193 | } 194 | } 195 | } 196 | -------------------------------------------------------------------------------- /Redis/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "redis", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "server.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1", 8 | "start": "node server.js" 9 | }, 10 | "keywords": [], 11 | "author": "", 12 | "license": "ISC", 13 | "dependencies": { 14 | "ioredis": "^5.4.2", 15 | "redis": "^4.7.0" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /Redis/pub-sub.js: -------------------------------------------------------------------------------- 1 | const redis = require("redis"); 2 | 3 | const client = redis.createClient({ 4 | host: "localhost", 5 | port: 6379, 6 | }); 7 | 8 | client.on("error", (error) => 9 | console.log("Redis client error occured!", error) 10 | ); 11 | 12 | async function testAdditionalFeatures() { 13 | try { 14 | await client.connect(); 15 | 16 | // const subscriber = client.duplicate(); //create a new client -> shares the same connection 17 | // await subscriber.connect(); // connect to redis server for the subscriber 18 | 19 | // await subscriber.subscribe("dummy-channel", (message, channel) => { 20 | // console.log(`Received message from ${channel}: ${message}`); 21 | // }); 22 | 23 | //publish message to the dummy channel 24 | // await client.publish("dummy-channel", "SOme dummy data from publiser"); 25 | // await client.publish( 26 | // "dummy-channel", 27 | // "Some new message again from publiser" 28 | // ); 29 | 30 | // await new Promise((resolve) => setTimeout(resolve, 3000)); 31 | 32 | // await subscriber.unsubscribe("dummy-channel"); 33 | // await subscriber.quit(); // close the subscriber connection 34 | 35 | //pipelining & transactions 36 | // const multi = client.multi(); 37 | 38 | // multi.set("key-transaction1", "value1"); 39 | // multi.set("key-transaction2", "value2"); 40 | // multi.get("key-transaction1"); 41 | // multi.get("key-transaction2"); 42 | 43 | // const results = await multi.exec(); 44 | // console.log(results); 45 | 46 | // const pipeline = client.multi(); 47 | // multi.set("key-pipeline1", "value1"); 48 | // multi.set("key-pipeline2", "value2"); 49 | // multi.get("key-pipeline1"); 50 | // multi.get("key-pipeline2"); 51 | 52 | // const pipelineresults = await multi.exec(); 53 | // console.log(pipelineresults); 54 | 55 | // //batch data operation -> 56 | // const pipelineOne = client.multi() 57 | 58 | // for(let i =0 ;i<1000; i++){ 59 | // pipeline.set(`user:${i}:action`, `Action ${i}`) 60 | // } 61 | 62 | // await pipelineOne.exec() 63 | 64 | // const dummyExample = client.multi() 65 | // multi.decrBy('account:1234:balance', 100) 66 | // multi.incrBy('account:0000:balance', 100) 67 | 68 | // const finalresults = await multi.exec() 69 | 70 | // const cartExample = client.multi() 71 | // multi.hIncrBy('cart:1234', 'item_count', 1) 72 | // multi.hIncrBy('cart:1234', 'total_price', 10) 73 | 74 | // await multi.exec() 75 | console.log("Performance test"); 76 | console.time("without pipelining"); 77 | 78 | for (let i = 0; i < 1000; i++) { 79 | await client.set(`user${i}`, `user_value${i}`); 80 | } 81 | 82 | console.timeEnd("without pipelining"); 83 | 84 | console.time("with pipelining"); 85 | const bigPipeline = client.multi(); 86 | 87 | for (let i = 0; i < 1000; i++) { 88 | bigPipeline.set(`user_pipeline_key${i}`, `user_pipeline_value${i}`); 89 | } 90 | 91 | await bigPipeline.exec(); 92 | 93 | console.timeEnd("with pipelining"); 94 | } catch (e) { 95 | console.error(e); 96 | } finally { 97 | client.quit(); 98 | } 99 | } 100 | 101 | testAdditionalFeatures(); 102 | -------------------------------------------------------------------------------- /Redis/server.js: -------------------------------------------------------------------------------- 1 | const redis = require("redis"); 2 | 3 | const client = redis.createClient({ 4 | host: "localhost", 5 | port: 6379, 6 | }); 7 | 8 | //event listener 9 | 10 | client.on("error", (error) => 11 | console.log("Redis client error occured!", error) 12 | ); 13 | 14 | async function testRedisConnection() { 15 | try { 16 | await client.connect(); 17 | console.log("Connected to redis"); 18 | 19 | await client.set("name", "sangam"); 20 | 21 | const extractValue = await client.get("name"); 22 | 23 | console.log(extractValue); 24 | 25 | const deleteCount = await client.del("name"); 26 | console.log(deleteCount); 27 | 28 | const extractUpdatedValue = await client.get("name"); 29 | console.log(extractUpdatedValue); 30 | 31 | await client.set("count", "100"); 32 | const incrementCount = await client.incr("count"); 33 | console.log(incrementCount); 34 | 35 | const decrementCount = await client.decr("count"); 36 | console.log(decrementCount); 37 | await client.decr("count"); 38 | await client.decr("count"); 39 | await client.decr("count"); 40 | await client.decr("count"); 41 | await client.decr("count"); 42 | console.log(await client.get("count")); 43 | } catch (error) { 44 | console.error(error); 45 | } finally { 46 | await client.quit(); 47 | } 48 | } 49 | 50 | testRedisConnection(); 51 | -------------------------------------------------------------------------------- /express-concepts/config/corsConfig.js: -------------------------------------------------------------------------------- 1 | const cors = require("cors"); 2 | 3 | const configureCors = () => { 4 | return cors({ 5 | //origin -> this will tell that which origins you want user can access your api 6 | origin: (origin, callback) => { 7 | const allowedOrigins = [ 8 | "http://localhost:3000", //local dev 9 | "https://yourcustomdomain.com", //production domain 10 | ]; 11 | 12 | if (!origin || allowedOrigins.indexOf(origin) !== -1) { 13 | callback(null, true); //giving permission so that req can be allowed 14 | } else { 15 | callback(new Error("Not allowed by cors")); 16 | } 17 | }, 18 | methods: ["GET", "POST", "PUT", "DELETE"], 19 | allowedHeaders: ["Content-Type", "Authorization", "Accept-Version"], 20 | exposedHeaders: ["X-Total-Count", "Content-Range"], 21 | credentials: true, //enable support for cookies, 22 | preflightContinue: false, 23 | maxAge: 600, // cache pre flight responses for 10 mins (600 seconds) -> avoid sending options requests multiple times 24 | optionsSuccessStatus: 204, 25 | }); 26 | }; 27 | 28 | module.exports = { configureCors }; 29 | -------------------------------------------------------------------------------- /express-concepts/middleware/apiVersioning.js: -------------------------------------------------------------------------------- 1 | const urlVersioning = (version) => (req, res, next) => { 2 | if (req.path.startsWith(`/api/${version}`)) { 3 | next(); 4 | } else { 5 | res.status(404).json({ 6 | success: false, 7 | error: "API version is not supported", 8 | }); 9 | } 10 | }; 11 | 12 | const headerVersioning = (version) => (req, res, next) => { 13 | if (req.get("Accept-Version") === version) { 14 | next(); 15 | } else { 16 | res.status(404).json({ 17 | success: false, 18 | error: "API version is not supported", 19 | }); 20 | } 21 | }; 22 | 23 | const contentTypeVersioning = (version) => (req, res, next) => { 24 | const contentType = req.get("Content-Type"); 25 | 26 | if ( 27 | contentType && 28 | contentType.includes(`application/vnd.api.${version}+json`) 29 | ) { 30 | next(); 31 | } else { 32 | res.status(404).json({ 33 | success: false, 34 | error: "API version is not supported", 35 | }); 36 | } 37 | }; 38 | 39 | module.exports = { urlVersioning, headerVersioning, contentTypeVersioning }; 40 | -------------------------------------------------------------------------------- /express-concepts/middleware/customMiddleware.js: -------------------------------------------------------------------------------- 1 | const requestLogger = (req, res, next) => { 2 | const timeStamp = new Date().toISOString(); 3 | const method = req.method; 4 | const url = req.url; 5 | const userAgent = req.get("User-Agent"); 6 | console.log(`[${timeStamp}] ${method} ${url} - ${userAgent}`); 7 | next(); 8 | }; 9 | 10 | const addTimeStamp = (req, res, next) => { 11 | req.timeStamp = new Date().toISOString(); 12 | next(); 13 | }; 14 | 15 | module.exports = { requestLogger, addTimeStamp }; 16 | -------------------------------------------------------------------------------- /express-concepts/middleware/errorHandler.js: -------------------------------------------------------------------------------- 1 | //custom error class 2 | 3 | class APIError extends Error { 4 | constructor(message, statusCode) { 5 | super(message); 6 | this.statusCode = statusCode; 7 | this.name = "APIError"; //set the error type to API Error 8 | } 9 | } 10 | 11 | const asyncHandler = (fn) => (req, res, next) => { 12 | Promise.resolve(fn(req, res, next)).catch(next); 13 | }; 14 | 15 | const globalErrorhandler = (err, req, res, next) => { 16 | console.error(err.stack); //log the erro stack 17 | 18 | if (err instanceof APIError) { 19 | return res.status(err.statusCode).json({ 20 | status: "Error", 21 | message: err.message, 22 | }); 23 | } 24 | 25 | //handle mongoose validation -> 26 | else if (err.name === "validationError") { 27 | return res.status(400).json({ 28 | status: "error", 29 | message: "validation Error", 30 | }); 31 | } else { 32 | return res.status(500).json({ 33 | status: "error", 34 | message: "An unexpected error occured", 35 | }); 36 | } 37 | }; 38 | 39 | module.exports = { APIError, asyncHandler, globalErrorhandler }; 40 | -------------------------------------------------------------------------------- /express-concepts/middleware/rateLimiting.js: -------------------------------------------------------------------------------- 1 | const rateLimit = require("express-rate-limit"); 2 | 3 | const createBasicRateLimiter = (maxRequests, time) => { 4 | return rateLimit({ 5 | max: maxRequests, 6 | windowMs: time, 7 | message: "Too many requests, please try again later", 8 | standardHeaders: true, 9 | legacyHeaders: false, 10 | }); 11 | }; 12 | 13 | module.exports = { createBasicRateLimiter }; 14 | -------------------------------------------------------------------------------- /express-concepts/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "express-concepts", 3 | "version": "1.0.0", 4 | 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"start": "node server.js" 10 | }, 11 | "keywords": [], 12 | "author": "", 13 | "license": "ISC", 14 | "devDependencies": { 15 | "nodemon": "^3.1.9" 16 | }, 17 | "dependencies": { 18 | "cors": "^2.8.5", 19 | "dotenv": "^16.4.7", 20 | "express": "^4.21.2", 21 | "express-rate-limit": "^7.5.0" 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /express-concepts/routes/item-routes.js: -------------------------------------------------------------------------------- 1 | const express = require("express"); 2 | const { asyncHandler, APIError } = require("../middleware/errorHandler"); 3 | 4 | const router = express.Router(); 5 | 6 | const items = [ 7 | { 8 | id: 1, 9 | name: "Item 1", 10 | }, 11 | { 12 | id: 2, 13 | name: "Item 2", 14 | }, 15 | { 16 | id: 3, 17 | name: "Item 3", 18 | }, 19 | { 20 | id: 4, 21 | name: "Item 4", 22 | }, 23 | { 24 | id: 5, 25 | name: "Item 5", 26 | }, 27 | ]; 28 | 29 | router.get( 30 | "/items", 31 | asyncHandler(async (req, res) => { 32 | res.json(items); 33 | }) 34 | ); 35 | 36 | router.post( 37 | "/items", 38 | asyncHandler(async (req, res) => { 39 | if (!req.body.name) { 40 | throw new APIError("Item name is required! Please add a name", 400); 41 | } 42 | 43 | const newItem = { 44 | id: items.length + 1, 45 | name: req.body.name, 46 | }; 47 | 48 | items.push(newItem); 49 | res.status(201).json(newItem); 50 | }) 51 | ); 52 | 53 | module.exports = router; 54 | -------------------------------------------------------------------------------- /express-concepts/server.js: -------------------------------------------------------------------------------- 1 | require("dotenv").config(); 2 | const express = require("express"); 3 | const { configureCors } = require("./config/corsConfig"); 4 | const { 5 | requestLogger, 6 | addTimeStamp, 7 | } = require("./middleware/customMiddleware"); 8 | const { globalErrorhandler } = require("./middleware/errorHandler"); 9 | const { urlVersioning } = require("./middleware/apiVersioning"); 10 | const { createBasicRateLimiter } = require("./middleware/rateLimiting.js"); 11 | const itemRoutes = require("./routes/item-routes.js"); 12 | 13 | const app = express(); 14 | const PORT = process.env.PORT || 3000; 15 | 16 | //express json middleware 17 | app.use(requestLogger); 18 | app.use(addTimeStamp); 19 | 20 | app.use(configureCors()); 21 | app.use(createBasicRateLimiter(2, 15 * 60 * 1000)); // 100 request per 15 minutes 22 | app.use(express.json()); 23 | 24 | app.use(urlVersioning("v1")); 25 | app.use("/api/v1", itemRoutes); 26 | 27 | app.use(globalErrorhandler); 28 | 29 | app.listen(PORT, () => { 30 | console.log(`Server is now running on port ${PORT}`); 31 | }); 32 | -------------------------------------------------------------------------------- /node-concepts/buffer-demo.js: -------------------------------------------------------------------------------- 1 | //objects -> handle binary data 2 | //file system operations, cryptography, image processing 3 | 4 | const buffOne = Buffer.alloc(10); //allocate a buffer of 10 bytes -> zeros 5 | console.log(buffOne); 6 | 7 | const buffFromString = Buffer.from("Hello"); 8 | console.log(buffFromString); 9 | 10 | const buffFromArrayOfintegers = Buffer.from([1, 2, 3, 4, 5, 0]); 11 | console.log(buffFromArrayOfintegers); 12 | 13 | buffOne.write("Sangam"); 14 | console.log("After writing Node js to buffOne", buffOne.toString()); 15 | 16 | console.log(buffFromString[0]); 17 | 18 | console.log(buffFromString.slice(0, 3)); 19 | 20 | const concatBuffs = Buffer.concat([buffOne, buffFromString]); 21 | console.log(concatBuffs); 22 | 23 | console.log(concatBuffs.toJSON()); 24 | -------------------------------------------------------------------------------- /node-concepts/event-loop.js: -------------------------------------------------------------------------------- 1 | // timers -> pending callbacks -> idle, prepare -> poll -> check -> close callback 2 | 3 | const fs = require("fs"); 4 | const crypto = require("crypto"); 5 | 6 | console.log("1. script start"); 7 | 8 | setTimeout(() => { 9 | console.log("2. settimeout 0s callback (macrotask)"); 10 | }, 0); 11 | 12 | setTimeout(() => { 13 | console.log("3. settimeout 0s callback (macrotask)"); 14 | }, 0); 15 | 16 | setImmediate(() => { 17 | console.log("4. setImmediate callback (check)"); 18 | }); 19 | 20 | Promise.resolve().then(() => { 21 | console.log("5. Promise resolved (microtask)"); 22 | }); 23 | 24 | process.nextTick(() => { 25 | console.log("6. process.nexttick callback (microtask)"); 26 | }); 27 | 28 | fs.readFile(__filename, () => { 29 | console.log("7. file read operation (I/O callback)"); 30 | }); 31 | 32 | crypto.pbkdf2("secret", "salt", 10000, 64, "sha512", (err, key) => { 33 | if (err) throw err; 34 | console.log("8. pbkdf2 operation completed (CPU intensive task)"); 35 | }); 36 | 37 | console.log("9. script ends"); 38 | -------------------------------------------------------------------------------- /node-concepts/input.txt: -------------------------------------------------------------------------------- 1 | sangam mukherjee -------------------------------------------------------------------------------- /node-concepts/output.txt.gz.enc: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sangammukherjee/NodeJS-Express-Redis-Concepts-2025/406aadbcf6169bf47f2ea1c6e2becb6aa00d8829/node-concepts/output.txt.gz.enc -------------------------------------------------------------------------------- /node-concepts/streams-demo.js: -------------------------------------------------------------------------------- 1 | //readable -> use for read 2 | //writable -> write to a file 3 | //duplex -> can be used for both read and write (TCP socket) 4 | //transform -> zlib steams 5 | 6 | const fs = require("fs"); 7 | const zlib = require("zlib"); // compression gzip 8 | const crypto = require("crypto"); 9 | const { Transform } = require("stream"); 10 | 11 | class EncryptStream extends Transform { 12 | constructor(key, vector) { 13 | super(); 14 | this.key = key; 15 | this.vector = vector; 16 | } 17 | 18 | _transform(chunk, encoding, callback) { 19 | const cipher = crypto.createCipheriv("aes-256-cbc", this.key, this.vector); 20 | const encrypted = Buffer.concat([cipher.update(chunk), cipher.final()]); // encrypt the chunk data 21 | this.push(encrypted); 22 | callback(); 23 | } 24 | } 25 | 26 | const key = crypto.randomBytes(32); 27 | const vector = crypto.randomBytes(16); 28 | 29 | const readableStream = fs.createReadStream("input.txt"); 30 | 31 | //new gzip object to compress the stream of data 32 | const gzipStream = zlib.createGzip(); 33 | 34 | const encryptStream = new EncryptStream(key, vector); 35 | 36 | const writableStream = fs.createWriteStream("output.txt.gz.enc"); 37 | 38 | //read -> compress -> encrypt -> write 39 | readableStream.pipe(gzipStream).pipe(encryptStream).pipe(writableStream); 40 | 41 | console.log("Streaming -> compressing -> writing data"); 42 | --------------------------------------------------------------------------------