Routing refers to how an application’s endpoints (URIs) respond to client requests. Expressjs official Docs
You define routing using express app object corresponding HTTP methods POST and GET method.
The following code shows an example of a very basic route.
A route method is derived from one of the HTTP methods and is attached and called on app object, an instance of the express class.
GET and POST Methods to the root off the app:
These routes defined in the above code snippet will map to:
http://localhost:3000/ when app is run locally and matching depends on whether client uses POST or GET method and vice versa.
The above route matches to http://localhost:3000/about when the app is run locally.
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