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Sure, I can help you with that. 😊

The line of code app.use(bodyParser.urlencoded({ extended : true})); is also used in Express, a web framework for Node.js. It tells the application to use another middleware called body-parser, which can parse the body of incoming HTTP requests and make it available under the req.body property¹.

The bodyParser.urlencoded({ extended : true})) function returns a middleware that only parses URL-encoded data, which is a common format for sending form data from web browsers to web servers². URL-encoded data is a string that represents key-value pairs, where the keys and values are separated by = and the pairs are separated by &. For example, name=Alice&age=25 is a URL-encoded data that contains two keys (name and age) and two values (Alice and 25).

The extended : true option tells the middleware to use the qs library to parse the URL-encoded data, which allows for more complex data structures to be encoded in the URL-encoded format, such as nested objects or arrays³. If the option is set to false, the middleware will use the querystring library, which only supports simple key-value