# Using nvm (recommended)
nvm install 18
nvm use 18
Or download directly
https://nodejs.org/en/download/

Copy

npm install -g @openai/codex-cli
Verify after global installation
codex —version

# Run initialization wizard
codex init
Manual configuration
mkdir -p ~/.codex
cat > ~/.codex/config.json << EOF
{
“api_key”: “sk-xxxxxxxxxxxxx”,
“organization”: “org-xxxxxxxxxxxxx”,
“model”: “codex-latest”
}
EOF

# Generate function
codex generate --lang javascript "Sort array"
Generate complete module
codex generate —type module “User authentication system”

# Python to JavaScript
codex translate --from python --to javascript ./script.py
Generate type definitions
codex generate-types ./api.js —output ./api.d.ts

# Explain code
codex explain ./complex-function.ts
Generate documentation
codex document ./src —output ./docs

# Batch process files
codex batch process ./input --output ./output
Use configuration file
codex run —config project.yaml

# Add to shell configuration file
export OPENAI_API_KEY="sk-..."
export OPENAI_ORG_ID="org-..."
export CODEX_MODEL="codex-latest"
export CODEX_MAX_TOKENS="2048"