The best way dealing with the un-welcome people is kicking him out of your party. The best way dealing with un-welcome IPs is to BLACK LIST. Background about today, an APP service running on Node.js server which included a static HTML website and API service. We got few un-welcome IPs list on hand and my boss told me“Peter, black list them.”. I love Node.js and Express, the design of middleware speedups I get the job done and leaving office early to have a Friday night. The problem is being broken down to three parts: Define blacklist IP Geting client IP Blocking Client IP, if it is in the blacklist Extracting Client ID in Express.js is super easy, and are tools which accelerating to extract all the client information which included Header, Cookies, Post Body, Get URL Parameters etc. Router req Define blacklist IP Putting unwelcome IPs in an array, which will be used in middleware to check where the router is going to direct. var BLACKLIST =['192.0.0.1'];//better to store as an String in process.env.BLACKLIST Fetch Client IP Express provide a super friendly req to fetch the client IP within few line of code. return the IP, could be ipv4 or ipv6. req.connection.remoteAddress var getClientIp = function(req) { var ipAddress = req.connection.remoteAddress; if (!ipAddress) {return '';} // convert from "::ffff:192.0.0.1"  to "192.0.0.1" if (ipAddress.substr(0, 7) == "::ffff:") {ipAddress = ipAddress.substr(7)} return ipAddress;}; Blocking Client IP, if it is in the blacklist Add an USER BLOCKING middleware function(req, res, next) inside app.use( ), this middleware function will be executed for every request to the app. Like a filter which let the right IPs to go through. app.use(function(req, res, next) {var ipAddress = getClientIp(req); if( .indexOf(ipAddress) !== -1){next();} else {res.send(ipAddress + ' IP is not in whiteList')}}); BLACKLIST Putting all together It is an example of putting above 3 parts together in a Express.js framework. To modify one which fit your BlackList IPs, go and push your IPs in BLACKLIST Array and they will never ever access the service. var express = require(‘express’)var app = express() // Part1, defining blacklist var BLACKLIST =['192.0.0.1']; // Part2, Geting client IP var getClientIp = function(req) {var ipAddress = req.connection.remoteAddress; if (!ipAddress) {return '';} // convert from "::ffff:192.0.0.1"  to "192.0.0.1"if (ipAddress.substr(0, 7) == "::ffff:") {ipAddress = ipAddress.substr(7)} return ipAddress;}; //Part3, Blocking Client IP, if it is in the blacklist app.use(function(req, res, next) {var ipAddress = getClientIp(req); if(BLACKLIST.indexOf(ipAddress) === -1){next();} else {res.send(ipAddress + ' IP is not in whiteList')}}); app.get(‘/’, function (req, res) {res.send(‘Hello World!’)}) #Thanks to , corrected the mistake Pierre Chamberlain BLACKLIST.indexOf(ipAddress) === -1 Remark req.headers[‘x-forwarded-for’] req.connection.remoteAddress req.connection.socket.remoteAddress : client, proxy1, proxy2, proxy3 1) x-forwarded-for If you are running behind a proxy like NGiNX or what have you, only then you should check for ‘x-forwarded-for’ (by alessioalex) **_2) req.connection.remoteAddress_**Default server is listening to IPv6 connections and the IPV6_V6ONLY flag isn’t set with the result that . IPv4 connections are processed by the same socket (by Wladimir Palant) **_3) req.connection.socket.remoteAddress_**On https, is undefined, but does work req.connection.remoteAddress req.connection.socket.remoteAddress (by Mathijs Kwik) You may also like: [Javascript] override Object.constructor( ) [Expressjs] override res.send Like this story? It is helpful to others? It helps me know if you’d like to see write more about his topic and helps people see the story, . when tap the heart below Reference: Git: https://github.com/wahengchang/javascript-must-know/tree/master/middleware_blockIp express-ipfilter https://www.npmjs.com/package/express-ipfilter expressjs.com http://expressjs.com/en/api.html stackoverflow http://stackoverflow.com/questions/10849687/express-js-how-to-get-remote-client-address http://stackoverflow.com/questions/24896386/request-connection-remoteaddress-now-prefixed-in-ffff-in-node-js http://stackoverflow.com/questions/5999379/how-to-find-out-the-remote-address-in-node-js-if-it-is-https-request

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[ Expressjs ] Cracking nuts, put the client IPs to BlackList

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[ Expressjs ] Cracking nuts, put the client IPs to BlackList

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