Supplying the Cache-Control header in Express applications

Let's install it with the NPM package manager:

npm install  express-cache-control

Enabling caching with the express-cache-control middleware requires three straightforward steps:

1. Get the module:

         CacheControl = require("express-cache-control") 
   

2. Create an instance of the middleware:

         var cache = new CacheControl().middleware; 
   

3. Bind the middleware instance to the routes you want to enable caching for:

         app.get('/contacts', cache('minutes',1), 
         function(request, 
         response) {
           var get_params = url.parse(request.url, 
           true).query;
   
           if (Object.keys(get_params).length == 0)
           {
             _v1.list(Contact, response);
           }
           else
           {
             var key = Object.keys(get_params)[0];
             var value = get_params[key];
   
             JSON.stringify(_v2.query_by_arg(Contact, key, 
        ...