Bundling and minification are used to optimize web content by reducing the number of requests to the server and as well as the size of requested assets (such as CSS and JavaScript).

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Since ASP.NET 4.5 in 2012, developers have had access to a pair of tools in their ASP.NET toolbox called “bundling and minification”. This feature would direct the webserver to combine together CSS or JavaScript files into one extra-large file and then apply a minification algorithm to shrink the size of the file for delivery. In ASP.NET 5 however, this feature is no longer available.


This post is going to cover taking a project that is using Bundler & Minifier and change it to use gulp instead.


There's runtime bundling on ASP.NET 4.x but in recent years web developers have used tools like Grunt or Gulp to orchestrate a client-side build process to squish their assets. The key is to find a balance that gives you easy access to development versions of JS/CSS assets when at dev time, while making it "zero work" to put minified stuff into production. Additionally, some devs don't need the Grunt/Gulp/npm overhead while others absolutely do. So how do you find balance? Here's how it works.