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

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.

Answer 2

You can put middleware functions into a separate module in the exact same way as you do for controller functions. It's just an exported function with the appropriate set of parameters.

So if you had a validation.js file, you could add your user validation method as:

exports.user = function (req, res, next) {
  ... // validate req and call next when done
};