installed-node-modules

Discover all importable Node.js modules including built-ins, installed packages, and workspace packages.

Installation

npm install installed-node-modules

Usage

const installedNodeModules = require('installed-node-modules');

// Get all available modules (including workspace packages)
const modules = installedNodeModules();
console.log(modules);
// ['fs', 'http', 'lodash', '@babel/core', '@or-q/plugin-core', ...]

// Get modules excluding workspace packages
const modulesNoWorkspace = installedNodeModules(false);
console.log(modulesNoWorkspace);
// ['fs', 'http', 'lodash', '@babel/core', ...]

What it discovers

This package finds all modules that can be imported in your Node.js environment:

1. Built-in modules - Core Node.js modules like fs, http, path, etc.
2. Installed packages - All packages found in node_modules directories that Node's resolver would find
3. Workspace packages - Local packages in pnpm/npm/yarn workspaces (optional, enabled by default)

API

installedNodeModules(withWorkspace = true)

Discover all importable Node.js modules including built-ins, installed packages, and workspace packages.

Returns an array of all importable module names.

Parameters:

• withWorkspace (boolean, default: true) - Whether to include workspace packages in the result

Returns:

• string[] - Array of module names that can be used with require() or import

How it works

The package uses the same resolution logic as Node.js itself:

• Built-ins: Uses require('module').builtinModules
• Installed packages: Searches all directories in require.resolve.paths() and require('module').globalPaths
• Workspace packages: Detects workspace roots by looking for pnpm-workspace.yaml or package.json with workspaces field, then resolves glob patterns to find package names

Use cases

• Plugin systems - Dynamically discover available plugins
• Development tools - Auto-complete for import statements
• Module introspection - Analyze what's available in your environment
• Testing - Verify expected modules are installed

License

MIT