1.nodemon
nodemon is a tool that helps develop Node.js based applications by automatically restarting the node application when file changes in the directory are detected.

nodemon does not require any additional changes to your code or method of development. nodemon is a replacement wrapper for node. To use nodemon, replace the word node on the command line when executing your script.

Installation
Either through cloning with git or by using npm (the recommended way):
npm install -g nodemon # or using yarn: yarn global add nodemon

2.morgan
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HTTP request logger middleware for node.js

Named after Dexter, a show you should not watch until completion.

API
var morgan = require('morgan')
morgan(format, options)
Create a new morgan logger middleware function using the given format and options. The format argument may be a string of a predefined name (see below for the names), a string of a format string, or a function that will produce a log entry.

The format function will be called with three arguments tokens, req, and res, where tokens is an object with all defined tokens, req is the HTTP request and res is the HTTP response. The function is expected to return a string that will be the log line, or undefined / null to skip logging.

3.mongoose
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Mongoose
Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Mongoose supports Node.js and Deno (alpha).

Build Status NPM version Deno version Deno popularity

npm

Documentation
The official documentation website is mongoosejs.com.

Mongoose 8.0.0 was released on October 31, 2023. You can find more details on backwards breaking changes in 8.0.0 on our docs site.