How to use custom route middleware with Sails.js? (ExpressJS)

You can use policies to achieve this. Save your isAjax function as isAjax.js under your api/policies folder, and change it to just use module.exports instead of module.exports.isAjax. Then in your config/policies.js file, you can specify which controllers/actions to apply the policy to--to run isAjax for every route, just do:

'*':'isAjax'

in that file.

I had the same issue of figuring out how to make use of middlewares.They are basically defined in the config/policies.js.
So, if you want to use middlewares(aka policies) like old style, you can do the following (this may not be the nicest way):

// config/policies.js'*': [   express.logger(),  function(req, res, next) {    // do whatever you want to    // and then call next()    next();  }]

However, the real sailjs way is to put all such policies in api/policies/ folder

To add compress middleware of express, I find this thread and

sails-middleware-example-issue are very usefull.

1. install express local: npm install express
2. load express: var exp = require('express')
3. add customMiddleware in $app_dir/config/local.js

express: {    customMiddleware: function (app) {      console.log("config of Middleware is called");      app.use(exp.logger());      app.use(exp.compress());      app.use(function (req, res, next) {        console.log("installed customMiddleware is used");        next();      })    }  }