var express = require('express');
var app = express();
// An example middleware function
var a_middleware_function = function(req, res, next) {
// ... perform some operations
next(); // Call next() so Express will call the next middleware function in the chain.
}
// Function added with use() for all routes and verbs
app.use(a_middleware_function);
// Function added with use() for a specific route
app.use('/someroute', a_middleware_function);
// A middleware function added for a specific HTTP verb and route
app.get('/', a_middleware_function);
app.listen(3000);
Above we declare the middleware function separately and then set it as the callback. In our previous route handler function we declared the callback function when it was used. In JavaScript, either approach is valid.
