NodeJs | Notion

`What is NodeJS?`

Dev Dependency

Dev dependencies refer to the packages or libraries that are necessary for the development and testing of a software project, but are not required for its actual execution or production use. In the context of Node.js development, dev dependencies are typically listed in the devDependencies section of the package.json file.

Here's a brief explanation:
- Development Dependencies (devDependencies):
  - These are packages or libraries that are needed during the development process.
  - They include tools for testing, debugging, code formatting, and other development tasks.
  - Examples include testing frameworks (like Mocha or Jest), build tools (like Webpack or Gulp), and code quality tools (like ESLint or Prettier).
  - Dev dependencies are not included when the application is deployed or used in production.
  - They are installed separately from production dependencies using package managers like npm or yarn.
  - Helps keep the production environment clean by only installing necessary dependencies for running the application.
```
 npm install --save-dev nodemon
 //save as dev dependencies
```

We can also uninstall packages from the node project by:
```
-> npm uninstall express
-> npm uninsall nodemon
```

package-lock.json
- The package-lock.json file is a JSON file automatically generated by npm when you install npm packages in your Node.js project.
- It has all of the dependencies tree.
- It's a file used by npm to lock down the version of every package that is installed in your project.
- It ensures that every developer working on the project installs the exact same versions of dependencies, reducing the chance of differences between environments.
  - Some times a module/dependency need 10 or more dependecies to run, and those are installed together within package-lock.json ,forming a dependency tree.