If you have to install an older version of a package, just specify it npm install <package>@<version> For example: npm install express@3.0.0 You can also add the –save flag to that command to add it to your package.json dependencies, or –save –save-exact flags if you want that exact version specified in your package.json dependencies. The … Read more
The difference between –save and –save-dev may not be immediately noticeable if you have tried them both on your own projects. So here are a few examples… Let’s say you were building an app that used the moment package to parse and display dates. Your app is a scheduler so it really needs this package … Read more
You can require any js file, you just need to declare what you want to expose. // tools.js // ======== module.exports = { foo: function () { // whatever }, bar: function () { // whatever } }; var zemba = function () { } And in your app file: // app.js // ====== var … Read more
I found it after looking through the documentation again. What I was looking for were the __filename and __dirname module-level variables. __filename is the file name of the current module. This is the resolved absolute path of the current module file. (ex:/home/kyle/some/dir/file.js) __dirname is the directory name of the current module. (ex:/home/kyle/some/dir)
npm 2 and newer It’s possible to pass args to npm run since npm 2 (2014). The syntax is as follows: npm run <command> [– <args>] Note the — separator, used to separate the params passed to npm command itself, and the params passed to your script. With the example package.json: “scripts”: { “grunt”: “grunt”, … Read more
Update Since Node v12 (April 2019), support for ES modules is enabled by default, and since Node v15 (October 2020) it’s stable (see here). Files including node modules must either end in .mjs or the nearest package.json file must contain “type”: “module”. The Node documentation has a ton more information, also about interop between CommonJS … Read more
Simplest Node.js server is just: $ npm install http-server -g Now you can run a server via the following commands: $ cd MyApp $ http-server If you’re using NPM 5.2.0 or newer, you can use http-server without installing it with npx. This isn’t recommended for use in production but is a great way to quickly … Read more
You can follow these tutorials to get started: Tutorials NodeSchool.io interactive lessons The Art of Node (an introduction to Node.js) Hello World Hello World Web Server (paid) Node.js guide Build a blog with Node.js, express and MongoDB Node.js for Beginners Learn Node.js Completely and with Confidence Node JS Processing Model – Single Threaded Model with … Read more
You need to use util.inspect(): const util = require(‘util’) console.log(util.inspect(myObject, {showHidden: false, depth: null, colors: true})) // alternative shortcut console.log(util.inspect(myObject, false, null, true /* enable colors */)) Outputs { a: ‘a’, b: { c: ‘c’, d: { e: ‘e’, f: { g: ‘g’, h: { i: ‘i’ } } } } }
Global libraries You can run npm list -g to see which global libraries are installed and where they’re located. Use npm list -g | head -1 for truncated output showing just the path. If you want to display only main packages not its sub-packages which installs along with it – you can use – npm … Read more