1.
What’s in it for you?
• What is Middleware?
• Functions of middleware
• Creating middleware in express

2.
What is Middleware?
Middleware is a request handler that has access to the
application's request-response cycle. It is a function
which contains request object, response object and the
next middleware function
Middleware can send the response to server before
the request
Request
API
MIDDLEWARE
Response

3.
Functions of middleware
Execute any code
Make changes to the
request response
objects
End the request-
response cycle
Call the next middleware
function in the stack