Assigning Middleware Globally to a Path

To assign middleware to all routes, you can implement the use() method on the Express app object. The use() method has the following syntax:

use([path], middleware)

The path variable is optional and defaults to /, which means all paths. The middleware parameter is a function that has the following syntax, where req is the Request object, res is the Response object, and next is the next middleware function to execute:

function(req, res, next)

Each of the middleware components has a constructor that returns the appropriate middleware function. For example, to apply the body-parser middleware to all paths with default parameters, you use the following statements:

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var express = require('express'),
var bodyParser = require('body-parser'),
var app = express();
app.use('/', bodyParser());