diff --git a/conf/.env b/conf/.env
index 2ee41a6..8b3f976 100644
--- a/conf/.env
+++ b/conf/.env
@@ -4,7 +4,7 @@
 NODE_ENV=production
 
 # The path to NODEJS
-PATH=__NODEJS_PATH__
+__YNH_NODE_LOAD_PATH__
 #---------------------------------------------
 # Debug OIDC OAuth2 etc.
 #DEBUG=true
@@ -16,7 +16,7 @@ MONGO_URL=mongodb://127.0.0.1:27017/__DB_NAME__
 # Production: https://example.com/wekan
 # Local: http://localhost:2000
 # ipaddress=$(ifdata -pa eth0)
-ROOT_URL=https://__DOMAIN_URI__
+ROOT_URL=https://__DOMAIN____PATH__
 #---------------------------------------------
 # Working email IS NOT REQUIRED to use Wekan.
 # https://github.com/wekan/wekan/wiki/Adding-users
diff --git a/conf/systemd.service b/conf/systemd.service
index 7b13646..31b859d 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -9,7 +9,7 @@ User=__APP__
 Group=__APP__
 EnvironmentFile=__FINALPATH__/.env
 WorkingDirectory=__FINALPATH__
-ExecStart=__NODEJS_PATH__/node __FINALPATH__/main.js
+ExecStart=__YNH_NODE__ __FINALPATH__/main.js
 Restart=on-failure
 #StartLimitInterval=86400
 #StartLimitBurst=5
diff --git a/scripts/install b/scripts/install
index bd7706c..87e4da9 100755
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,7 @@
 
 source _common.sh
 source ynh_detect_arch__2
+source ynh_add_config
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -133,32 +134,15 @@ ynh_system_user_create --username=$app --home_dir="$final_path"
 ynh_print_info --message="Configuring a systemd service..."
 
 # Create a dedicated systemd config
-ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="../conf/systemd.service"
-ynh_replace_string --match_string="__MONGODB_SERVICENAME__" --replace_string="$mongodb_servicename" --target_file="../conf/systemd.service"
-ynh_add_systemd_config
+ynh_add_systemd_config --others_var="mongodb_servicename ynh_node"
 
 #=================================================
 # MODIFY A CONFIG FILE
 #=================================================
 ynh_print_info --message="Modifying a config file..."
 
-config_file="$final_path/.env"
-cp "../conf/.env" $config_file
-
-ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="$config_file"
-ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$config_file"
-ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$config_file"
-ynh_replace_string --match_string="__DOMAIN_URI__" --replace_string="$domain$path_url" --target_file="$config_file"
-ynh_replace_string --match_string="__PORT__" --replace_string="$port" --target_file="$config_file"
-ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$config_file"
-
-#=================================================
-# STORE THE CONFIG FILE CHECKSUM
-#=================================================
-ynh_print_info --message="Storing the config file checksum..."
-
-# Calculate and store the config file checksum into the app settings
-ynh_store_file_checksum --file="$config_file"
+# Create a dedicated .env config
+ynh_add_config
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 957c1c5..2f0326c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -9,6 +9,7 @@
 source _common.sh
 source ynh_package_version
 source ynh_detect_arch__2
+source ynh_add_config
 source /usr/share/yunohost/helpers
 
 #=================================================
@@ -38,8 +39,8 @@ ynh_print_info --message="Ensuring downward compatibility..."
 
 # If db_name doesn't exist, create it
 if [ -z "$db_name" ]; then
-    db_name=$(ynh_sanitize_dbid --db_name=$app)
-    ynh_app_setting_set --app=$app --key=db_name --value=$db_name
+	db_name=$(ynh_sanitize_dbid --db_name=$app)
+	ynh_app_setting_set --app=$app --key=db_name --value=$db_name
 fi
 
 #=================================================
@@ -47,7 +48,7 @@ fi
 #=================================================
 
 if [ ${PACKAGE_CHECK_EXEC:-0} -eq 1 ]; then
-  sleep 60
+	sleep 60
 fi
 abort_if_up_to_date
 # previous function is what defines 'version', more precisely the 'previous version'
@@ -89,50 +90,50 @@ ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd
 ynh_print_info --message="Managing upgrade from previous version..."
 
 if ynh_version_gt "0.45-2" "${previous_version}" ; then
-    ynh_print_info --message="Upgrading to 0.45-2..."
-    ynh_replace_string --match_string="Environment=ROOT_URL=http://127.0.0.1:$port$path_url" --replace_string="Environment=ROOT_URL=https://$domain$path_url/" --target_file="/etc/systemd/system/$app.service"
-    systemctl daemon-reload
+	ynh_print_info --message="Upgrading to 0.45-2..."
+	ynh_replace_string --match_string="Environment=ROOT_URL=http://127.0.0.1:$port$path_url" --replace_string="Environment=ROOT_URL=https://$domain$path_url/" --target_file="/etc/systemd/system/$app.service"
+	systemctl daemon-reload
 fi
 
 if ynh_version_gt "0.45-3" "${previous_version}" ; then
-    ynh_print_info --message="Upgrading to 0.45-3..."
-    yunohost service add $app
+	ynh_print_info --message="Upgrading to 0.45-3..."
+	yunohost service add $app
 fi
 
 if ynh_version_gt "1.07~ynh2" "${previous_version}" ; then
-    ynh_print_info --message="Upgrading to 1.07~ynh2..."
+	ynh_print_info --message="Upgrading to 1.07~ynh2..."
 
-   # Replace mongodb packages
-   # Assume no other app needs it >.>
-   rm -f /etc/apt/sources.list.d/mongodb-org-3.2.list
-   ynh_remove_app_dependencies
-   ynh_install_app_dependencies "mongodb mongodb-server"
-   yunohost service remove mongod
-   yunohost service add mongodb --log "/var/log/mongodb/mongodb.log"
+	# Replace mongodb packages
+	# Assume no other app needs it >.>
+	rm -f /etc/apt/sources.list.d/mongodb-org-3.2.list
+	ynh_remove_app_dependencies
+	ynh_install_app_dependencies "mongodb mongodb-server"
+	yunohost service remove mongod
+	yunohost service add mongodb --log "/var/log/mongodb/mongodb.log"
 fi
 
 if ynh_version_gt "2.56~ynh1" "${previous_version}" ; then
-    # Create a dedicated .env config
-    config_file="$final_path/.env"
-    touch $config_file
+	# Create a dedicated .env config
+	config_file="$final_path/.env"
+	touch $config_file
 fi
 
 # Create the permission "admin" only if it doesn't exist.
 if ! ynh_permission_exists --permission="admin"
 then
-  ynh_print_info --message="Upgrading Permission configuration..."
+	ynh_print_info --message="Upgrading Permission configuration..."
 
 	ynh_app_setting_delete --app=$app --key=unprotected_uris
 
-  is_public=$(ynh_app_setting_get --app=$app --key=is_public)
+	is_public=$(ynh_app_setting_get --app=$app --key=is_public)
 
-  if [ $is_public -eq 1 ]; then
-    ynh_permission_update --permission "main" --add "visitors"
-  fi
+	if [ $is_public -eq 1 ]; then
+		ynh_permission_update --permission "main" --add "visitors"
+	fi
 
 	ynh_app_setting_delete --app=$app --key=is_public
 
-  ynh_permission_create --permission="admin"
+	ynh_permission_create --permission="admin"
 fi
 
 #=================================================
@@ -142,25 +143,25 @@ fi
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_print_info --message="Upgrading source files..."
-		
-  # Create a temporary directory
-  tmpdir="$(mktemp -d)"
+	
+	# Create a temporary directory
+	tmpdir="$(mktemp -d)"
 
-  # Backup the env file in the temp dir
-  cp -a "$final_path/.env" "$tmpdir/.env"
+	# Backup the env file in the temp dir
+	cp -a "$final_path/.env" "$tmpdir/.env"
 
-  # Remove the app directory securely
-  ynh_secure_remove --file="$final_path"
+	# Remove the app directory securely
+	ynh_secure_remove --file="$final_path"
 
-  architecture=$(ynh_detect_arch)
-  # Download, check integrity, uncompress and patch the source from app.src
+	architecture=$(ynh_detect_arch)
+	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$final_path" --source_id="$architecture"
   
-  #Copy the admin saved settings from tmp directory to final path
-  cp -a  "$tmpdir/.env" "$final_path/.env"
+	#Copy the admin saved settings from tmp directory to final path
+	cp -a  "$tmpdir/.env" "$final_path/.env"
   
-  # Remove the tmp directory securely
-  ynh_secure_remove --file="$tmpdir"
+	# Remove the tmp directory securely
+	ynh_secure_remove --file="$tmpdir"
 fi
 
 #=================================================
@@ -181,11 +182,11 @@ ynh_install_nodejs --nodejs_version=$nodejsversion
 ynh_use_nodejs
 
 if [ "$(lsb_release --codename --short)" = "buster" ]; then
-  ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" --package="$pkg_dependencies_buster" --key="https://www.mongodb.org/static/pgp/server-4.2.asc"
-  mongodb_servicename=$mongodb_buster
+	ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian buster/mongodb-org/4.2 main" --package="$pkg_dependencies_buster" --key="https://www.mongodb.org/static/pgp/server-4.2.asc"
+	mongodb_servicename=$mongodb_buster
 else
-  ynh_install_app_dependencies $pkg_dependencies
-  mongodb_servicename=$mongodb_stretch
+	ynh_install_app_dependencies $pkg_dependencies
+	mongodb_servicename=$mongodb_stretch
 fi
 
 #=================================================
@@ -202,16 +203,7 @@ ynh_system_user_create --username=$app --home_dir="$final_path"
 ynh_print_info --message="Modifying a config file..."
 
 # Create a dedicated .env config
-config_file="$final_path/.env"
-ynh_backup_if_checksum_is_different --file="$config_file"
-cp "../conf/.env" "$config_file"
-ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="$config_file"
-ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$config_file"
-ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$config_file"
-ynh_replace_string --match_string="__DOMAIN_URI__" --replace_string="$domain$path_url" --target_file="$config_file"
-ynh_replace_string --match_string="__PORT__" --replace_string="$port" --target_file="$config_file"
-ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$config_file"
-ynh_store_file_checksum "$config_file"
+ynh_add_config
 
 #=================================================
 # SETUP SYSTEMD
@@ -219,9 +211,7 @@ ynh_store_file_checksum "$config_file"
 ynh_print_info --message="Upgrading systemd configuration..."
 
 # Create a dedicated systemd config
-ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="../conf/systemd.service"
-ynh_replace_string --match_string="__MONGODB_SERVICENAME__" --replace_string="$mongodb_servicename" --target_file="../conf/systemd.service"
-ynh_add_systemd_config
+ynh_add_systemd_config --others_var="mongodb_servicename ynh_node"
 
 #=================================================
 # GENERIC FINALIZATION
@@ -242,7 +232,7 @@ ynh_print_info --message="Starting a systemd service..."
 
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd --line_match="Started Wekan, task board"
 if [ ${PACKAGE_CHECK_EXEC:-0} -eq 1 ]; then
-  sleep 60
+	sleep 60
 fi
 
 #=================================================
diff --git a/scripts/ynh_add_config b/scripts/ynh_add_config
new file mode 100644
index 0000000..9435819
--- /dev/null
+++ b/scripts/ynh_add_config
@@ -0,0 +1,143 @@
+#!/bin/bash
+
+# Create a dedicated  config file
+#
+# usage: ynh_add_config [--origin="origin file"] [--destination="destination file"] [--vars="vars to replace"]
+# | arg: -o, --origin=     - Template config file to use (optionnal, ../conf/.env by default)
+# | arg: -d, --destination=    - Destination of the config file (optionnal, $final_path/.env)
+# | arg: -v, --vars=  - List of variables to replace separated by a space. For example: 'var_1 var_2 ...'
+#
+# This will use the template $origin or ../conf/.env by default
+# to generate a config file $destination or $final_path/.env by default,
+# by replacing the following keywords with global variables
+# that should be defined before calling this helper :
+#   __PATH__      by  $path_url
+#   __DOMAIN__    by $domain
+#   __PORT__    by $port
+#   __NAME__    by $app
+#   __NAMETOCHANGE__    by $app
+#   __USER__    by $app
+#   __APP__    by $app
+#   __FINALPATH__    by $final_path
+#   __PHPVERSION__    by $YNH_PHP_VERSION
+#   __YNH_NPM__    by $ynh_npm
+#   __YNH_NODE__    by $ynh_node
+#   __YNH_NODE_LOAD_PATH__    by $ynh_node_load_PATH
+#   __NODEJS_PATH__    by $nodejs_path
+#   __NODEJS_VERSION__    by $nodejs_version
+#   __DB_NAME__    by $db_name
+#   __DB_USER__    by $db_user
+#   __DB_PWD__    by $db_pwd
+#
+# And dynamic variables (from the last example) :
+#   __VAR_1__    by $var_1
+#   __VAR_2__    by $var_2
+#
+# The helper will verify the checksum and backup the destination file
+# if it's different before applying the new origin file.
+# And it will calculate and store a destination file checksum
+# into the app settings when configuraation is done.
+#
+ynh_add_config () {
+    # Declare an array to define the options of this helper.
+    local legacy_args=odv
+    local -A args_array=( [o]=origin= [d]=destination= [v]=vars= )
+    local origin
+    local destination
+    local vars
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    local origin="${origin:-"../conf/.env"}"
+    local destination="${destination:-"$final_path/.env"}"
+    local vars="${vars:-}"
+
+    ynh_backup_if_checksum_is_different --file="$destination"
+    cp "$origin" "$destination"
+
+    #Replace usual YunoHost variables
+    if test -n "${path_url:-}"
+    then
+        # path_url_slash_less is path_url, or a blank value if path_url is only '/'
+        local path_url_slash_less=${path_url%/}
+        ynh_replace_string --match_string="__PATH__/" --replace_string="$path_url_slash_less/" --target_file="$destination"
+        ynh_replace_string --match_string="__PATH__" --replace_string="$path_url" --target_file="$destination"
+    fi
+    if test -n "${domain:-}"; then
+        ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$destination"
+    fi
+    if test -n "${port:-}"; then
+        ynh_replace_string --match_string="__PORT__" --replace_string="$port" --target_file="$destination"
+    fi
+    if test -n "${app:-}"; then
+        ynh_replace_string --match_string="__NAME__" --replace_string="$app" --target_file="$destination"
+        ynh_replace_string --match_string="__NAMETOCHANGE__" --replace_string="$app" --target_file="$destination"
+        ynh_replace_string --match_string="__USER__" --replace_string="$app" --target_file="$destination"
+        ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$destination"
+    fi
+    if test -n "${final_path:-}"; then
+        ynh_replace_string --match_string="__FINALPATH__" --replace_string="$final_path" --target_file="$destination"
+    fi
+    if test -n "${YNH_PHP_VERSION:-}"; then
+        ynh_replace_string --match_string="__PHPVERSION__" --replace_string="$YNH_PHP_VERSION" --target_file="$destination"
+    fi
+    if test -n "${ynh_npm:-}"; then
+        ynh_replace_string --match_string="__YNH_NPM__" --replace_string="$ynh_npm" --target_file="$destination"
+    fi
+    if test -n "${ynh_node:-}"; then
+        ynh_replace_string --match_string="__YNH_NODE__" --replace_string="$ynh_node" --target_file="$destination"
+    fi
+    if test -n "${ynh_node_load_PATH:-}"; then
+        ynh_replace_string --match_string="__YNH_NODE_LOAD_PATH__" --replace_string="$ynh_node_load_PATH" --target_file="$destination"
+    fi
+    if test -n "${nodejs_path:-}"; then
+        ynh_replace_string --match_string="__NODEJS_PATH__" --replace_string="$nodejs_path" --target_file="$destination"
+    fi
+    if test -n "${nodejs_version:-}"; then
+        ynh_replace_string --match_string="__NODEJS_VERSION__" --replace_string="$nodejs_version" --target_file="$destination"
+    fi
+    if test -n "${db_name:-}"; then
+        ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$destination"
+    fi
+    if test -n "${db_user:-}"; then
+        ynh_replace_string --match_string="__DB_USER__" --replace_string="$db_user" --target_file="$destination"
+    fi
+    if test -n "${db_pwd:-}"; then
+        ynh_replace_string --match_string="__DB_PWD__" --replace_string="$db_pwd" --target_file="$destination"
+    fi
+
+    # Replace all other variables given as arguments
+    for var_to_replace in $vars
+    do
+        # ${var_to_replace^^} make the content of the variable on upper-cases
+        # ${!var_to_replace} get the content of the variable named $var_to_replace 
+        ynh_replace_string --match_string="__${var_to_replace^^}__" --replace_string="${!var_to_replace}" --target_file="$destination"
+    done
+
+    ynh_store_file_checksum --file="$destination"
+}
+
+# Remove the dedicated config
+#
+# usage: ynh_remove_config [--file=file]
+# | arg: -f, --file=     - Config file to remove (optionnal, $final_path/.env)
+#
+#
+ynh_remove_config () {
+    # Declare an array to define the options of this helper.
+    local legacy_args=f
+    local -A args_array=( [f]=file= )
+    local file
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    local service="${file:-}"
+
+    # The default behaviour is to use .env file.
+    if [ -n "$file" ]; then
+        file="final_path/.env"
+    fi
+
+    if [ -e "$file" ]
+    then
+        ynh_secure_remove --file="$file"
+    fi
+}