Step 1: Install Node.js

Method 1: Install with nvm (Recommended)

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
source ~/.bashrc
nvm install --lts

Method 2: Debian/Ubuntu

curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
sudo apt-get install -y nodejs

NOTE

WSL Users Note

• Ensure WSL2 is installed (Ubuntu distribution recommended)
• nvm installation is recommended to avoid permission issues

TIP

Verify installation

node --version
npm --version

Step 2: Install Claude Code

npm install -g @anthropic-ai/claude-code

TIP

Verify Claude Code installation

claude --version

Step 3: Set environment variables

Method 1: Temporary (current session)

export ANTHROPIC_BASE_URL="https://api.bsf.ai"
export ANTHROPIC_AUTH_TOKEN="your_api_key"

Method 2: bash permanent (Recommended)

echo '' >> ~/.bashrc
echo '# API config' >> ~/.bashrc
echo 'export ANTHROPIC_BASE_URL="https://api.bsf.ai"' >> ~/.bashrc
echo 'export ANTHROPIC_AUTH_TOKEN="your_api_key"' >> ~/.bashrc
source ~/.bashrc

Method 3: zsh permanent

echo 'export ANTHROPIC_BASE_URL="https://api.bsf.ai"' >> ~/.zshrc
echo 'export ANTHROPIC_AUTH_TOKEN="your_api_key"' >> ~/.zshrc
source ~/.zshrc

TIP

Verify environment variables

echo $ANTHROPIC_BASE_URL
echo $ANTHROPIC_AUTH_TOKEN

Step 4: Start using

claude

FAQ

Issue: npm permission error (EACCES)

mkdir ~/.npm-global
npm config set prefix '~/.npm-global'
echo 'export PATH=~/.npm-global/bin:$PATH' >> ~/.bashrc
source ~/.bashrc
npm install -g @anthropic-ai/claude-code

Issue: Accessing Windows files in WSL

# Windows filesystem is mounted at /mnt/
cd /mnt/c/Users/YourName/

# Working in WSL native filesystem is recommended
cd ~