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I am just trying out ASP.NET MVC 4 but I can't figure out how to disable Javascript/CSS minification feature. Especially for development environment this will help greatly on debugging. I would imagine it would be a switch in web.config but since ASP.NET MVC 4 is still in beta stage at the moment there's really not much information out there. Would appreciate if someone can help or point to the right blog posts etc.

Best Answer:

Another option would be to create an HTML Helper that you could use to build the script and link tags. Here is what I have implemented for the Javascript, which can also be done for the CSS:

public static class BundleHelper
        public static MvcHtmlString JsBundle(this HtmlHelper helper, string bundlePath)
            var jsTag = new TagBuilder("script");
            jsTag.MergeAttribute("type", "text/javascript");
            return ReferenceBundle(helper, bundlePath, jsTag);
        public static MvcHtmlString ReferenceBundle(this HtmlHelper helper, string bundlePath, TagBuilder baseTag)
            var httpContext = helper.ViewContext.HttpContext;
            var urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
            Bundle bundle = BundleTable.Bundles.GetBundleFor(bundlePath);
            var htmlString = new StringBuilder();
            if (bundle != null)
                var bundleContext = new BundleContext(helper.ViewContext.HttpContext, BundleTable.Bundles, urlHelper.Content(bundlePath));
                if (!httpContext.IsDebuggingEnabled)
                    baseTag.MergeAttribute("href", System.Web.Optimization.BundleTable.Bundles.ResolveBundleUrl(bundlePath));
                    return new MvcHtmlString(baseTag.ToString());
                foreach (var file in bundle.EnumerateFiles(bundleContext))
                    var basePath = httpContext.Server.MapPath("~/");
                    if (file.FullName.StartsWith(basePath))
                        var relPath = urlHelper.Content("~/" + file.FullName.Substring(basePath.Length));
                        baseTag.MergeAttribute("href", relPath, true);
            return new MvcHtmlString(htmlString.ToString());

Now all that you have to do is call it in your view:

    <meta charset="utf-8" />
    <title>@ViewBag.Title - My ASP.NET MVC Application</title>
    <link href="~/favicon.ico" rel="shortcut icon" type="image/x-icon" />
    <link href="~/Content/css" rel="stylesheet" type="text/css" />
    <link href="~/Content/themes/base/css" rel="stylesheet" type="text/css" />
    <meta name="viewport" content="width=device-width" />

And it will render the scripts as separate references, or use the new bundling/minification feature depending on what the debug setting is in your web.config . I used some of the code from as a reference when creating my helper if you wanted to see some more examples. Their helper is written a little better, throwing exceptions when invalid arguments are supplied, etc.... I just haven't gotten around to cleaning mine up yet.

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