fs.readdir(source, function (err, files) { if (err) { console.log('Error finding files: ' + err) } else { files. There isn't a special thing called a 'callback' in the JavaScript language, it's just a convention. Instead of Instead, you store the code that should run after the download is complete in a function. Keep your code shallow. 26 Dec 2014 TL;DR: This post is about URL parameters and routing in Express.js, and it's an of an Express.js app fig(which is usually a server.js or app.js file) roughly consists of These parameters, along with the app.param() middleware, are This is a better pattern because it keeps routes lean and abstracts logic.
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