How to put middleware in it's own file in Node.js / Express.js

Question

I am new to the whole Node.js thing, so I am still trying to get the hang of how things "connect".

I am trying to use the express-form validation. As per the docs you can do

app.post( '/user', // Route     form( // Form filter and validation middleware     filter("username").trim()   ),    // Express request-handler gets filtered and validated data   function(req, res){     if (!req.form.isValid) {       // Handle errors       console.log(req.form.errors);      } else {       // Or, use filtered form data from the form object:       console.log("Username:", req.form.username);      }   } ); 

In App.js. However if I put something like app.get('/user', user.index); I can put the controller code in a separate file. I would like to do the same with the validation middleware (or put the validation code in the controller) to make the App.js file easier to overview once I start adding more pages.

Is there a way to accomplish this?

Basically I would like to put something like app.get('/user', validation.user, user.index);

Answer 1

This is how you define your routes:

routes.js:

module.exports = function(app){     app.get("route1", function(req,res){...})     app.get("route2", function(req,res){...}) } 

This is how you define your middlewares:

middlewares.js:

module.exports = {     formHandler: function(req, res, next){...} } 

app.js:

// Add your middlewares: middlewares = require("middlewares"); app.use(middlewares.formHandler); app.use(middlewares...);  // Initialize your routes: require("routes")(app) 

Another way would be to use your middleware per route:

routes.js:

middlewares = require("middlewares") module.exports = function(app){     app.get("route1", middlewares.formHandler, function(req,res){...})     app.get("route2", function(req,res){...}) } 

I hope I answer your questions.