Handling Routes and HTTP Methods in Express

A route is a rule that pairs an HTTP method with a URL path and names the function that answers matching requests. Every route in Express has the same form:

app.METHOD(PATH, HANDLER);

METHOD is an HTTP method written in lowercase, such as get, post, put or delete. PATH is the path to match, such as /users. HANDLER is the function that Express calls with req and res when both the method and the path match. When a request arrives, Express checks the routes in the order they were registered and calls the first handler whose method and path both match