By default, the express-generator includes several packages that are commonly used with an Express server. Running npm install installs all dependencies for the project. If you’re unfamiliar with npm, it’s the default Node.js package manager. If you’re unfamiliar with terminal commands, this one puts you inside of the myapp directory: npm install This creates a new Express project called myapp, which is then placed inside of the myapp directory: cd myapp This installs the Express generator as a global package, allowing you to run the express command in your terminal: express myapp Starting a new project with the Express generator is as simple as running a few commands: npm install express-generator -g We cover installing Node using a version manager in our quick tip, “ Install Multiple Versions of Node.js Using nvm”. To do this, either head to the official Node download page and grab the correct binaries for your system, or use a version manager such as nvm. The first thing you’ll need is to get Node and npm installed on your machine. You pass in the data you want to be rendered and Express will render it with your given view engine. Views are how HTML pages are rendered with custom content.
It accesses requests before your routes get them, allowing them to handle hard-to-do stuff like cookie parsing, file uploads, errors, and more. If you’re new to the term, basically middleware is “software glue”. Express makes it easy for you to modularize this code by allowing you to put different routes in different files. This is how /home /blog and /about all give you different pages. What is Express?Įxpress has a lot of features built in, and a lot more features you can get from other packages that integrate seamlessly, but there are three main things it does for you out of the box: However, starting a new Express application requires a certain amount of boilerplate code: starting a new server instance, configuring a view engine, and setting up error handling.Īlthough there are various starter projects and boilerplates available, Express has its own command-line tool that makes it easy to start new apps, called the express-generator. It has easy-to-use routing and simple support for view engines, putting it far ahead of the basic Node HTTP server. Express.js is a Node.js web framework that has gained immense popularity due to its simplicity.
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