Series: AI Tool Series

Claude Code is a powerful, terminal-based AI tool from Anthropic that brings agentic workflows and code generation directly to your CLI. If you’re looking to integrate AI seamlessly into your development flow—Claude Code is your new best friend. 💡 This guide walks you through installing, configuring, and using Claude Code from scratch. It also includes solutions for common issues. 🧰 Prerequisites Before getting started, ensure you have the following: A terminal or command line interface (macOS, Linux, or Windows with WSL) Node.js version ≥ 18 (preferably installed via nvm) npm package manager Access to console.anthropic.com ⚙️ Step-by-Step Installation 1️⃣ Check Your Node.js Version bash CopyEdit node –version If it’s below 18, upgrade using nvm. 2️⃣ Install Node.js v18+ Using NVM bash CopyEdit # Install Node.js 18 nvm install 18 nvm use 18 # Or use the latest LTS version nvm install –lts nvm use –lts # Confirm version node –version 3️⃣ Install Claude Code Globally bash CopyEdit npm install -g @anthropic-ai/claude-code 4️⃣ Verify Installation bash CopyEdit claude –version You should see:1.0.9 (Claude Code) or similar. 🔐 Authenticate with Anthropic 5️⃣ Login via CLI bash CopyEdit claude login You’ll be prompted to enter your Anthropic API key. 6️⃣ Get Your Anthropic API Key If you don’t have an API key: Go to console.anthropic.com Sign in or create an account Navigate to API Keys Click “Create Key” Copy the key (starts with sk-ant-) Paste it in when prompted by claude login 🧪 Test Claude Code with a Prompt bash CopyEdit claude -p “make a hello.py script that prints ‘Hello, world!'” If everything is set up correctly, Claude will output the Python script within seconds. 🔁 Alternative: Set API Key as Environment Variable If you prefer not to use claude login, set your API key manually: bash CopyEdit # For current session export ANTHROPIC_API_KEY=sk-ant-yourkey # Make it persistent echo ‘export ANTHROPIC_API_KEY=sk-ant-yourkey’ >> ~/.zshrc source ~/.zshrc 🛠️ Common Issues and Fixes ⚠️ Issue 💡 Cause 🛠️ Solution Unsupported engine warning Node.js version is too old Upgrade Node.js to v18+ via NVM ReadableStream is not defined Missing Web Streams support Upgrade Node.js and reinstall Claude Code Invalid API key Wrong or expired API key Re-authenticate using claude login ✅ Final Check Try out another prompt to confirm everything is working: bash CopyEdit claude -p “generate a shell script to compress all .log files into archive.tar.gz” 🎉 You’re now ready to build, automate, and accelerate your development with Claude Code.