body-parser

Author: learning-zone

README.md

@@ -2543,7 +2543,47 @@ app.listen(3000, function(){
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-#### Q. ***Explain the terms body-parser, cookie-parser, debug, jade, morgan, nodemon, pm2, serve-favicon, cors, .env, checksum, fs-extra, moment in Express JS?***
+## Q. ***Explain the terms body-parser, cookie-parser, debug, jade, morgan, nodemon, pm2, serve-favicon, cors, .env, checksum, fs-extra, moment in Express JS?***
+
+**1. `body-parser`**
+
+`body-parser` extract the entire body portion of an incoming request stream and exposes it on `req.body`. This body-parser module parses the JSON, buffer, string and URL encoded data submitted using HTTP POST request.
+
+*Example*:
+
+```bash
+npm install express ejs body-parser
+```
+
+**server.js**
+
+```js
+var express = require('express')
+var bodyParser = require('body-parser')
+
+var app = express()
+
+// create application/json parser
+var jsonParser = bodyParser.json()
+
+// create application/x-www-form-urlencoded parser
+var urlencodedParser = bodyParser.urlencoded({ extended: false })
+
+// POST /login gets urlencoded bodies
+app.post('/login', urlencodedParser, function (req, res) {
+  res.send('welcome, ' + req.body.username)
+})
+
+// POST /api/users gets JSON bodies
+app.post('/api/users', jsonParser, function (req, res) {
+  // create user in req.body
+})
+```
+
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+</div>
+
 #### Q. ***How does routing work in Node.js?***
 #### Q. ***How Node prevents blocking code?***
 #### Q. ***What is difference between promise and async await in Node.js?***