Download and install node latest NodeJS and Npm on Windows (shell: Git Bash or similar).

node-npm-git-bash-win.sh

#!/usr/bin/env bash
# This script can install NodeJS and NPM on Windows
# Run this command in GitBash Windows console to get latest version:
#
#     $ curl -Ls https://gist.github.com/andkirby/raw/node-npm-git-bash-win.sh | bash
#
# Last update: 2022-04-29

set -o errexit
set -o pipefail
set -o nounset
#set -o xtrace

readonly ERR_FATAL=1
readonly ERR_LOGIC=2
readonly ERR_PARAMS=3

# colors
t_red='\e[0;31m'
t_green='\e[0;32m'
t_yellow='\e[0;33m'
t_cyan='\e[0;36m'
t_reset='\e[0m'

echo_head() {
  echo -e "${t_green}${@}${t_reset}"
}
echo_note() {
  echo -e "${t_cyan}${@}${t_reset}"
}
echo_notice() {
  echo -e "${t_yellow}notice:${t_reset} ${@}"
}
echo_warning() {
  echo -e "${t_red}warning:${t_reset} ${@}"
}
check_error () {
  local status=${1}
  shift
  if [ '0' != "${status}" ]; then
    echo "error: $@" > /dev/stderr
    exit ${status}
  fi
}


init() {
  echo_head ' == Install NodeJS == '
  printf 'Making NodeJS home dir ~/.node/...'
  mkdir -p ~/.node
  init_user_home_bin
}

init_user_home_bin() {
  if [ ! -d "${HOME}/bin" ]; then
    mkdir -p "${HOME}/bin"
  fi
}

is_node_installed() {
  test -d ~/.node/${node_name}
}

fetch_node() {
  echo 'Fetching NodeJS files...'
  releases_url='https://nodejs.org/dist/'
  os='win'
  os_mode='x64'
  # === Download nodeJS ===
  # determine version
  node_version=$(curl -s ${releases_url} | grep -Eo '>v[^<]+' | tr -d '>/' | sort -V | tail -1)
  export node_version
  [ -z "${node_version}" ] && check_error ${ERR_LOGIC} 'Cannot find last NodeJS version.'

  echo "Found node version: ${node_version}"
  export node_name="node-${node_version}-${os}-${os_mode}"
  export node_base_dir="${HOME}/.node"
  export node_archive="${node_base_dir}/${node_name}.zip"
  export node_dir="${node_base_dir}/${node_name}"
  if is_node_installed; then
    check_error ${ERR_LOGIC} "The node version ${node_name} already installed."
  fi
  if [[ -e "${node_archive}" ]]; then
    echo_notice "Found archive ${node_archive/${HOME}/'~'}. Ignore downloading."
  else
    curl -s "${releases_url}${node_version}/${node_name}.zip" -o ${node_archive}
    echo 'OK'
  fi
}

unpack_node() {
  mkdir -p ${node_dir}
  echo "Unzipping: ${node_archive/${HOME}/'~'}..."
  unzip -qq -o ${node_archive} -d ${node_base_dir}
  # validate unpacked node.exe
  if [ ! -f ${node_dir}/node.exe ]; then
    check_error ${ERR_FATAL} "No binary file by path: ${node_dir}/node.exe"
  fi
  # Remove archive
  rm -f ${node_archive}
}

define_binaries() {
  export bin_path=${HOME}'/bin'
  node_dir_abs=$(echo ${node_dir} | sed -r 's|~|'${HOME}'|g')
  ###########################################
  # Generate binary input files
  short_version=$(echo ${node_version} | grep -Eo '([0-9]+)' | head -1)

  # bin files for BASH
  set_bin 'node.exe' ${short_version}
  set_bin 'npm' ${short_version}
  set_bin 'npx' ${short_version}

  echo_head 'Binary files:'
  echo '  EXE: '${node_dir/${HOME}/'~'}'/node.exe'
  echo '  '${bin_path/${HOME}/'~'}'/node'
  echo '  '${bin_path/${HOME}/'~'}'/node'${short_version}
  echo_note '  (Windows CMD)'
  echo '  '${bin_path/${HOME}/'~'}'/node.cmd'
  echo '  '${bin_path/${HOME}/'~'}'/node'${short_version}'.cmd'
  echo_note '  EXE: '${node_dir/${HOME}/'~'}'/npm'
  echo '  '${bin_path/${HOME}/'~'}'/npm'
  echo '  '${bin_path/${HOME}/'~'}'/npm'${short_version}
  echo_note '  (Windows CMD)'
  echo '  '${bin_path/${HOME}/'~'}'/npm.cmd'
  echo '  '${bin_path/${HOME}/'~'}'/npm'${short_version}'.cmd'
  echo_note '  EXE: '${node_dir/${HOME}/'~'}'/npx'
  echo '  '${bin_path/${HOME}/'~'}'/npx'
  echo '  '${bin_path/${HOME}/'~'}'/npx'${short_version}
  echo_note '  (Windows CMD)'
  echo '  '${bin_path/${HOME}/'~'}'/npx.cmd'
  echo '  '${bin_path/${HOME}/'~'}'/npx'${short_version}'.cmd'
}

set_bin() {
  binary_name=$(basename ${1})
  short_version=${2}
  binary_ref_name="${binary_name%.*}"

  # bin files for BASH
  cat << EOS > ${bin_path}/${binary_ref_name}
#!/usr/bin/env bash
${node_dir}/${binary_name} \${@}
EOS

  if [[ -n "${short_version}" ]]; then
    cat << EOS > ${bin_path}/${binary_ref_name}${short_version}
#!/usr/bin/env bash
${node_dir}/${binary_name} \${@}
EOS
  fi

  # set bin files for native CMD in Windows
  node_dir_abs_win=$(echo ${node_dir_abs} | sed -r 's|^[/]([a-z])[/]|\1:/|' | tr '/' '\\')
  if [[ -f ${node_dir_abs_win}\\${binary_ref_name}.cmd ]]; then
    # set Windows .cmd extension
    binary_name=${binary_ref_name}.cmd
  fi
  cat << EOS > ${bin_path}/${binary_ref_name}.cmd
${node_dir_abs_win}\\${binary_name} %*
EOS
  cat << EOS > ${bin_path}/${binary_ref_name}${short_version}.cmd
${node_dir_abs_win}\\${binary_name} %*
EOS
}

######################
# Init

init
fetch_node
unpack_node
define_binaries

To execute this script, run:

curl -Ls https://gist.github.com/andkirby/raw/node-npm-git-bash-win.sh | bash