undefined extended provide extended option code example

Example 1: express bodyparser deprecated

body-parser has been deprecated from express v4.* 
Use body-parser package instead.
npm i body-parser

import bodyParser from "body-parser";//for typscript code only, use require for js
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

Example 2: body-parser deprecated

app.use(bodyParser.urlencoded());

app.use(bodyParser.json());