How to manage Node.js versions?

# Install nvm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

# Install Node version
nvm install 20
nvm install --lts

# Switch versions
nvm use 20
nvm use --lts

# List versions
nvm list

# Set default
nvm alias default 20

# Run with specific version
nvm exec 18 node app.js

# Create .nvmrc in project root
echo "20" > .nvmrc

# Auto-use version
nvm use

npm install -g n

n 20          # Install v20
n lts         # Install LTS
n latest      # Install latest

n             # Interactive selection

# Install fnm
curl -fsSL https://fnm.vercel.app/install | bash

fnm install 20
fnm use 20
fnm default 20

# Auto-switch on cd
eval "$(fnm env --use-on-cd)"

node --version
node -v