JavaScript tools: npx#

npx is a command-line tool that comes with npm (Node Package Manager) and allows you to execute npm package binaries and run one-off commands without installing them globally. It’s essential for modern JavaScript development and data science workflows.

For data scientists, npx is useful when:

  • Running JavaScript-based data visualization tools
  • Converting notebooks and documents
  • Testing and formatting code
  • Running development servers

Here are common npx commands:

# Run a package without installing
npx http-server .                # Start a local web server
npx prettier --write .           # Format code or docs
npx eslint .                     # Lint JavaScript
npx ts-node script.ts            # Run TypeScript directly
npx esbuild app.js               # Bundle JavaScript
npx jsdoc .                      # Generate JavaScript docs

# Run specific versions
npx [email protected] --write .        # Use prettier 3.6

# Execute remote scripts (use with caution!)
npx github:user/repo            # Run from GitHub

Watch this introduction to npx (6 min):

What you can do with npx (6 min)

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