2-Nodejs Course 2023: Package.json file
Tags: node, typescript, mongodb, fastify
Published: 2022-10-27 10:51:11

---
title: 2-Nodejs Course 2023: Package.json file
published: true
description: 
series: Nodejs Course 2023
tags: nodejs, typescript, mongodb, fastify
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# published_at: 2022-10-25 09:51 +0000
---

## 🔥 Package.json

The package.json file is the most important file in your project. It contains all the information about your project, including the dependencies, scripts, and other metadata.

The package.json file is a JSON file that contains the following properties:

- `name`: The name of your project.
- `version`: The version of your project.
- `description`: A short description of your project.
- `main`: The entry point of your project.
- `scripts`: A collection of scripts that you can run using npm or yarn.
- `keywords`: A list of keywords that describe your project.
- `author`: The author of your project.
- `license`: The license of your project.
- `dependencies`: A list of dependencies that your project needs to run.
- `devDependencies`: A list of dependencies that your project needs to run in development mode.
- `peerDependencies`: A list of dependencies that your project needs to run in production mode and are not installed automatically.
- `repository`: The URL of the repository of your project.
- `bugs`: The URL of the issue tracker of your project.
- `homepage`: The URL of the homepage of your project.

## Scripts

The scripts property is a collection of scripts that you can run using npm or yarn. The scripts property is an object that contains the name of the script as the key and the command to run as the value.

For example, the following script runs the `start` script using npm:

```bash
npm run start
```

The following script runs the `start` script using yarn:

```bash
yarn start
```

The command `start` will call the `start` script in the `scripts` property of the package.json file.

## Dependencies

The dependencies property is a collection of dependencies that your project needs to run. The dependencies property is an object that contains the name of the dependency as the key and the version of the dependency as the value.

For example, the following dependency installs the `fastify` package:

```json
"dependencies": {
  "fastify": "^3.24.1"
}
```

This will install `fastify` version `3.24.1` and all its dependencies.

## Dev Dependencies

The devDependencies property is a collection of dependencies that your project needs to run in development mode. The devDependencies property is an object that contains the name of the dependency as the key and the version of the dependency as the value, as it is only needed in development mode.

For example, the following dependency installs the `typescript` package:

```json
"devDependencies": {
  "typescript": "^4.5.4"
}
```

This will install `typescript` version `4.5.4` and all its dependencies.

## Peer Dependencies

The peerDependencies property is a collection of dependencies that your project needs to run in production mode and are not installed automatically. The `peerDependencies` property is an object that contains the name of the dependency as the key and the version of the dependency as the value thus all packages in the `peerDependencies` property must be installed manually.

## Other Properties

The rest of the properties are mostly self-explanatory. The `main` property is the entry point of your project. The `repository` property is the URL of the repository of your project. The `bugs` property is the URL of the issue tracker of your project. The `homepage` property is the URL of the homepage of your project.

## 🎨 Conclusion

In this lesson, we learned about the package.json file. We learned about the `scripts` property, the `dependencies` property, the `devDependencies` property, and the `peerDependencies` property. We also learned about the other properties of the package.json file.

## 🎨 Project Repository

You can find the latest updates of this project on [Github](https://github.com/hassanzohdy/nodejs-2023)

## 😍 Join our community

Join our community on [Discord](https://discord.gg/vtZE9YzaFz) to get help and support (Node Js 2023 Channel).