Error: Most middleware (like json) is no longer bundled with Express and must be installed separately. Please see

There are a number of changes with express 4.x. Like the error says, all of the middleware has been removed.

Update your package.json to include the "new" packages, a basic list can be found here and a full list here

Using your code from above, you would just need the following:

// package.json{  "dependencies":  {    "express":"*",    "body-parser":"*"  }}

Then update your source to reflect the new changes:

// app.jsvar http = require('http'),    fs = require('fs'),    express = require('express'),    bodyParser = require('body-parser'),    mysql = require('mysql'),    ejs = require('ejs');var app = express();app.use(bodyParser.urlencoded({    extended: true}));app.use(bodyParser.json());

Note that app.use(app.router) has been removed as well.

if some middleware is not bundled with express then dont use express keyword while using them..

instead of this -

app.use(express.bodyParser());

write this -

app.use(bodyParser());

In my case i was exporting a package that i didn't install i.e express package. after installing the package my issue went away. the middleware i was using is

app.use(express.json())

Check your package.json file whether you installed the package or not. If it is not installed then you might be getting same error.