Routers can be created according to REST principles such as get, post, put, delete etc.. GET => get request to r etrieve data from database or data store(An array). POST => post request to insert data to database or data store(An array). PUT => put request to update the data in database or data store(An array). DELETE => delete request to delete data in database or data store(An array). Creation of routers. In this scenario I have created a schema call users using mongoose. using mongoose the created users model is retrieved. GET request using the keyword " get" the data can be retrieved. retrieving all the users in the database. By giving a parameter in the url we can get information according to the given subject. user is retrieved according to the _id. POST request using the keyword "pos t" the...