🌟 Node.js – Managing Dependencies

In Node.js, dependencies are external packages/modules that your project needs to run.
NPM (Node Package Manager) is used to install, update, remove, and manage these dependencies.

Dependency info is stored in:

• package.json → main dependency list

• package-lock.json → locks exact versions

• node_modules/ → installed package files

✅ 1. Install a Dependency

A. Install a package (for production)

This adds it to:

B. Install a package for development

Adds to:

✅ 2. Install a Specific Version

✅ 3. Update Dependencies

Update a single package

Update all packages

Check which packages are outdated

It shows:

| Package | Current | Wanted | Latest | Location |

✅ 4. Remove a Dependency

This removes it from node_modules and package.json.

✅ 5. Install All Dependencies from package.json

When cloning a project from GitHub:

This installs everything listed in:

• dependencies

• devDependencies

✅ 6. Global vs Local Dependencies

Local Modules (default)

Installed inside your project folder.

Global Modules

Available system-wide.

Check global modules:

✅ 7. Versioning Rules in Dependencies

In package.json:

Example:

• ^ caret → allow minor & patch updates

• ~ tilde → allow only patch updates

• none → exact version

• * → any version

✅ 8. Peer Dependencies

Used when a package requires another package to be installed by the user (framework plugins, libraries, etc.).

Example:

✅ 9. Optional Dependencies

Not required; installation continues even if they fail.

Example:

✅ 10. Checking Dependency Tree

Or global:

🔥 Complete Example of Managing Dependencies

Install packages:

Install dev tools:

Update:

Remove:

Install dependencies from project:

🎯 Summary