19/06/2017

ExpressJS – Routing

💙Routing function is used to define routes in an Express application.

              

💙app.method(path, handler)

          This method can be applied to any one of the HTTP verbs – get, set, put, delete. 

          Path is the route at which the request will run.
          Handler is a callback function that executes when a matching request type is found on the relevant route.

ExpressJS – HTTP Methods

HTTP methods:

     1.GET

     

     2.POST

     3.PUT

     4.DELETE

ExpressJS – Middleware

💙These functions are used to modify req and res objects for tasks like parsing request bodies, adding response headers, etc.

Updating Documents

💙Mongoose provides 3 functions to update documents. The functions are described below:

1.Model.update(condition, updates, callback)

2.Model.findOneAndUpdate(condition, updates, callback)

3.Model.findByIdAndUpdate(id, updates, callback)
         💙This function updates a single document identified by its id.

Deleting Documents

1.Model.remove(condition, [callback])

2.Model.findOneAndRemove(condition, [callback])

3.Model.findByIdAndRemove(id, [callback])
        💙This function removes a single document identified by its id.

ExpressJS – Cookies

❤Every time the user loads the website back, this cookie is sent with the request.

 💙This helps us keep track of the user’s actions.

💙The following are the numerous uses of the HTTP Cookies:

1.Session management

2.Personalization

3.User tracking