How to fix npm WARN npm npm WARN npm npm does not support Node.js v10. This version of npm supports node 12 and higher in npm

node --version
npm --version

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

# Reload shell config
source ~/.bashrc
# or
source ~/.zshrc

# Install latest LTS
nvm install --lts
nvm use --lts

# Verify
node --version
npm --version

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

# Install latest LTS
fnm install --lts
fnm use lts

# Verify
node --version
npm --version

echo "20" > .nvmrc

nvm use
# Automatically switches to Node 20

# GitHub Actions
- uses: actions/setup-node@v4
  with:
    node-version: '20'

# Or read from .nvmrc
- uses: actions/setup-node@v4
  with:
    node-version-file: '.nvmrc'

# Old
FROM node:10-alpine

# New
FROM node:20-alpine