My Node.js notes

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Node.js Package Manager (npm)


Initialize an npm project. Within project directory use npm init command. The default command launches a questionnaire. To answer default on all questions use -y argument.

Uninstall global module

npm uninstall -g nodemon

Install local module

npm install nodemon

Install as dev dependency (not installed on production environment)

npm install nodemon --save-dev

Basic stuff

debugger statement and node inspect


Exit Chrome DevTool debugger.

Type restart at console after exiting Chrome DevTool to restart app with same arguments.

Press CTRL+C twice to exit debugger in console.


If nodemon installed globally

nodemon <> -e <comma separated list of extensions to monitor>

If nodemon installed locally a script can launch. See scripts key section for details.

package.json info

scripts key

create key value pair where key is name of script and value is script location


"scripts": {
    "dev": "nodemon src/app.js -e js,hbs"

At node prompt type npm run dev to execute script nodemon src/app.js -e js,hbs

NPM modules

CORS is a node.js package for providing a Connect/Express middleware that can be used to enable CORS with various options.

The official MongoDB driver for Node.js. Provides a high-level API on top of mongodb-core that is meant for end users.

Mongoose provides a straight-forward, schema-based solution to model your application data. It includes built-in type casting, validation, query building, business logic hooks and more, out of the box.

validator is a library of string validators and sanitizers.

bcryptjs is optimized bcrypt in JavaScript with zero dependencies. Compatible to the C++ bcrypt binding on node.js and also works in browser.

jsonwebtokens is an implementation of JSON Web Tokens.

Multer is a node.js middleware for handling multipart/form-data, which is primarily used for uploading files. It is written on top of busboy for maximum efficiency.

busboy is a node.js module for parsing incoming HTML form data.

sharp is a high speed node.js module that convert large images in common formats to smaller, web-friendly JPEG, PNG and WebP images of varying dimensions.

env-cmd is a simple node program for executing commands using an environment from an env file.

jest is a delightful JavaScript testing library

mocha is a simple, flexible, fun JavaScript test framework for Node.js & the browser

HTTP assertions made easy via superagent. The motivation with supertest is to provide a high-level abstraction for testing HTTP, while still allowing you to drop down to the lower-level API provided by superagent.

Socket.IO enables real-time bidirectional event-based communication. Socket.IO home

bad-words is a javascript filter for badwords.

moment is a lightweight JavaScript date library for parsing, validating, manipulating, and formatting dates.


Node.js home

regex 101

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