diff --git a/README.mime.type-javascript-mjs b/README.mime.type-javascript-mjs
new file mode 100644
index 0000000..516cd02
--- /dev/null
+++ b/README.mime.type-javascript-mjs
@@ -0,0 +1,15 @@
+# ---
+# Serving mjs files with nginx
+# ---
+
+
+# In file '/etc/nginx/mime.types' find line 
+#
+#     application/javascript    js;
+#
+# and replace this line with
+#
+#
+#     application/javascript    js mjs;
+#
+perl -i -n -p -e "s#^(\s*application/javascript\s+)js;#\1js mjs;#" /etc/nginx/mime.types
diff --git a/add-mime-types-for-mjs-files.sh b/add-mime-types-for-mjs-files.sh
new file mode 100755
index 0000000..52e4116
--- /dev/null
+++ b/add-mime-types-for-mjs-files.sh
@@ -0,0 +1,233 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+LOCK_DIR="$(mktemp -d)"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+backup_date="$(date +%Y-%m-%d-%H%M)"
+
+nginx_file_mime_types=/etc/nginx/mime.types
+
+# ----------
+# Base Function(s)
+# ----------
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
+   else
+      echo -e "   [ Fatal ] $*"
+   fi
+   echo ""
+   if $terminal ; then
+      echo -e "             \033[1mScript terminated\033[m.."
+   else
+      echo -e "             Script terminated.."
+   fi
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+warn (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[33m\033[1mWarn\033[m ]  $*"
+      else
+         echo "   [ Warn ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+info (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+      else
+         echo "   [ Info ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+ok (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mOk\033[m ]    $*"
+      else
+         echo "   [ Ok ]    $*"
+      fi
+      echo ""
+   fi
+}
+
+echo_done() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mdone\033[m ]"
+   fi
+}
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+echo_wait(){
+   if $terminal ; then
+      echo -en "\033[75G[ \033[5m\033[1m...\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+# ----------
+# - Jobhandling
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   terminal=false
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+fi
+
+restart_nginx_service=false
+
+if [[ ! -d "/etc/nginx" ]] ; then
+   fatal "No Nginx installation found!"
+fi
+
+if [[ ! -f "/etc/nginx/mime.types" ]] ; then
+   fatal "File \033[1m/etc/nginx/mime.types\033[m not found!"
+fi
+
+blank_line
+echononl "Add .mjs to known JavaScripz MIME types .."
+
+if $(grep -E -q "^\s*application/javascript\s+.*mjs" ${nginx_file_mime_types} 2> /dev/null) ; then
+   echo_skipped
+else
+   if $(grep -E -q "^\s*application/javascript\s+" ${nginx_file_mime_types} 2> /dev/null) ; then
+      perl -i -n -p -e "s#^(\s*application/javascript\s+.*);#\1 mjs;#" ${nginx_file_mime_types} 2> ${log_file}
+      if [[ $? -ne 0 ]]; then
+         echo_failed
+         error "$(cat $log_file)"
+      else
+         echo_ok
+         restart_nginx_service=true
+      fi
+   else
+      echo_skipped
+      warn "No line 'application/javascript' found!"
+      echononl "Add entry \033[1mapplication/javascript js mjs\033[m to mime.types."
+      perl -i -n -p -e "s#^(\s*types\s+{)#\1\n\n    application/javascript                js mjs;\n#" \
+         ${nginx_file_mime_types} 2> ${log_file}
+      if [[ $? -ne 0 ]]; then
+         echo_failed
+         error "$(cat $log_file)"
+      else
+         echo_ok
+         restart_nginx_service=true
+      fi
+
+   fi
+fi
+
+blank_line
+echononl "Restart Nginx WebsService"
+if $restart_nginx_service ; then
+
+   systemctl start nginx > "$log_file" 2>&1
+   if [[ $? -ne 0 ]]; then
+      echo_failed
+      error "$(cat $log_file)"
+   else
+      echo_ok
+   fi
+else
+   echo_skipped
+fi
+
+clean_up 0