diff --git a/packages/node_modules/@node-red/runtime/lib/flows/Flow.js b/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
index 489ec42cb..2e1e97c4b 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/Flow.js
@@ -416,23 +416,50 @@ class Flow {
         return this.activeNodes;
     }
 
-    /*!
-     * Get value of environment variable defined in group node.
-     * @param {String} group - group node
-     * @param {String} name - name of variable
-     * @return {Object} object containing the value in val property or null if not defined
+
+    /**
+     * Group callback signature
+     *
+     * @callback GroupEnvCallback
+     * @param {Error} err The error object (or null)
+     * @param {[result: {val:Any}, name: String]} result The result of the callback
+     * @returns {void}
      */
-    getGroupEnvSetting(node, group, name) {
+
+    /**
+    * @function getGroupEnvSetting
+    * Get a group setting value synchronously.
+    * This currently automatically defers to the parent
+    * @overload
+     * @param {Object} node
+     * @param {Object} group
+     * @param {String} name
+     * @returns {Any}
+     *
+     * Get a group setting value asynchronously.
+     * @overload
+     * @param {Object} node
+     * @param {Object} group
+     * @param {String} name
+     * @param {GroupEnvCallback} callback
+     * @returns {void}
+    */
+
+    getGroupEnvSetting(node, group, name, callback) {
+        /** @type {GroupEnvCallback} */
+        const returnOrCallback = (err, [result, newName]) => {
+            if (callback) {
+                callback(err, [result, newName]);
+                return
+            }
+            return [result, newName];
+        }
         if (group) {
             if (name === "NR_GROUP_NAME") {
-                return [{
-                    val: group.name
-                }, null];
+                return returnOrCallback(null, [{ val: group.name }, null]);
             }
             if (name === "NR_GROUP_ID") {
-                return [{
-                    val: group.id
-                }, null];
+                return returnOrCallback(null, [{ val: group.id }, null]);
             }
 
             if (group.credentials === undefined) {
@@ -457,33 +484,32 @@ class Flow {
                     if (env) {
                         let value = env.value;
                         const type = env.type;
-                        if ((type !== "env") ||
-                            (value !== name)) {
+                        if ((type !== "env") || (value !== name)) {
                             if (type === "env") {
                                 value = value.replace(new RegExp("\\${"+name+"}","g"),"${$parent."+name+"}");
-                            }
-                            if (type === "bool") {
-                                const val
-                                      = ((value === "true") ||
-                                         (value === true));
-                                return [{
-                                    val: val
-                                }, null];
+                            } else if (type === "bool") {
+                                const val = ((value === "true") || (value === true));
+                                return returnOrCallback(null, [{ val: val }, null])
                             }
                             if (type === "cred") {
-                                return [{
-                                    val: value
-                                }, null];
+                                return returnOrCallback(null, [{ val: value }, null])
                             }
                             try {
-                                var val = redUtil.evaluateNodeProperty(value, type, node, null, null);
-                                return [{
-                                    val: val
-                                }, null];
+                                if (!callback) {
+                                    var val = redUtil.evaluateNodeProperty(value, type, node, null, null);
+                                    return [{ val: val }, null];
+                                } else {
+                                    redUtil.evaluateNodeProperty(value, type, node, null, (err, value) => {
+                                        return returnOrCallback(err, [{ val: value }, null])
+                                    });
+                                    return
+                                }
                             }
                             catch (e) {
-                                this.error(e);
-                                return [null, null];
+                                if (!callback) {
+                                    this.error(e);
+                                }
+                                return returnOrCallback(e, null);
                             }
                         }
                     }
@@ -494,27 +520,47 @@ class Flow {
             }
             if (group.g) {
                 const parent = this.getGroupNode(group.g);
-                return this.getGroupEnvSetting(node, parent, name);
+                const gVal = this.getGroupEnvSetting(node, parent, name, callback);
+                if (callback) {
+                    return;
+                }
+                return gVal;
             }
         }
-        return [null, name];
+        return returnOrCallback(null, [null, name]);
     }
 
-
+    /**
+     * Settings callback signature
+     *
+     * @callback SettingsCallback
+     * @param {Error} err The error object (or null)
+     * @param {Any} result The result of the callback
+     * @returns {void}
+     */
     /**
      * Get a flow setting value. This currently automatically defers to the parent
      * flow which, as defined in ./index.js returns `process.env[key]`.
      * This lays the groundwork for Subflow to have instance-specific settings
-     * @param  {[type]} key [description]
-     * @return {[type]}     [description]
+     * @param  {String} key The settings key
+     * @param  {SettingsCallback} callback Optional callback function
+     * @return {Any}
      */
-    getSetting(key) {
+    getSetting(key, callback) {
+        /** @type {SettingsCallback} */
+        const returnOrCallback = (err, result) => {
+            if (callback) {
+                callback(err, result);
+                return
+            }
+            return result;
+        }
         const flow = this.flow;
         if (key === "NR_FLOW_NAME") {
-            return flow.label;
+            return returnOrCallback(null, flow.label);
         }
         if (key === "NR_FLOW_ID") {
-            return flow.id;
+            return returnOrCallback(null, flow.id);
         }
         if (flow.credentials === undefined) {
             flow.credentials = credentials.get(flow.id) || {};
@@ -544,15 +590,14 @@ class Flow {
                         }
                         try {
                             if (type === "bool") {
-                                const val = ((value === "true") ||
-                                             (value === true));
-                                return val;
+                                const val = ((value === "true") || (value === true));
+                                return returnOrCallback(null, val);
                             }
                             if (type === "cred") {
-                                return value;
+                                return returnOrCallback(null, value);
                             }
                             var val = redUtil.evaluateNodeProperty(value, type, null, null, null);
-                            return val;
+                            return returnOrCallback(null, val);
                         }
                         catch (e) {
                             this.error(e);
@@ -564,7 +609,11 @@ class Flow {
                 key = key.substring(8);
             }
         }
-        return this.parent.getSetting(key);
+        const pVal = this.parent.getSetting(key, callback);
+        if (callback) {
+            return;
+        }
+        return pVal;
     }
 
     /**
diff --git a/packages/node_modules/@node-red/runtime/lib/flows/index.js b/packages/node_modules/@node-red/runtime/lib/flows/index.js
index e18861f17..9c6133ea5 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/index.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/index.js
@@ -780,7 +780,7 @@ const flowAPI = {
     getNode: getNode,
     handleError: () => false,
     handleStatus: () => false,
-    getSetting: k => flowUtil.getEnvVar(k),
+    getSetting: (k, callback) => flowUtil.getEnvVar(k, callback),
     log: m => log.log(m)
 }
 
diff --git a/packages/node_modules/@node-red/runtime/lib/flows/util.js b/packages/node_modules/@node-red/runtime/lib/flows/util.js
index 868657c7b..39ff820b4 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/util.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/util.js
@@ -308,16 +308,34 @@ module.exports = {
             runtime.settings.envVarExcludes.forEach(v => envVarExcludes[v] = true);
         }
     },
-    getEnvVar: function(k) {
-        if (!envVarExcludes[k]) {
-            const item = getGlobalEnv(k);
+    /**
+     * Get the value of an environment variable
+     * Call with a callback to get the value asynchronously
+     * or without to get the value synchronously
+     * @param {String} key The name of the environment variable
+     * @param {(err: Error, val: Any)} [callback] Optional callback for asynchronous call
+     * @returns {Any | void} The value of the environment variable or undefined if not found
+     */
+    getEnvVar: function(key, callback) {
+        const returnOrCallback = function(err, val) {
+            if (callback) {
+                callback(err, val);
+                return;
+            }
+            return val;
+        }
+        if (!envVarExcludes[key]) {
+            const item = getGlobalEnv(key);
             if (item) {
-                const val = redUtil.evaluateNodeProperty(item.value, item.type, null, null, null);
+                const val = redUtil.evaluateNodeProperty(item.value, item.type, null, null, callback);
+                if (callback) {
+                    return;
+                }
                 return val;
             }
-            return process.env[k];
+            return returnOrCallback(null, process.env[key]);
         }
-        return undefined;
+        return returnOrCallback(undefined);
     },
     diffNodes: diffNodes,
     mapEnvVarProperties: mapEnvVarProperties,
diff --git a/packages/node_modules/@node-red/util/lib/util.js b/packages/node_modules/@node-red/util/lib/util.js
index ad05d45f1..8511376d7 100644
--- a/packages/node_modules/@node-red/util/lib/util.js
+++ b/packages/node_modules/@node-red/util/lib/util.js
@@ -18,6 +18,7 @@
 /**
  * @mixin @node-red/util_util
  */
+/** @typedef {import('../../runtime/lib/flows/Flow.js').Flow} RuntimeLibFlowsFlow */
 
 const clonedeep = require("lodash.clonedeep");
 const jsonata = require("jsonata");
@@ -526,37 +527,67 @@ function setObjectProperty(msg,prop,value,createMissing) {
     return true;
 }
 
-/*!
+/**
  * Get value of environment variable.
  * @param {Node} node - accessing node
  * @param {String} name - name of variable
+ * @param {RuntimeLibFlowsFlow} flow_ - (optional) flow to check for setting
+ * @param  {(err: Error, result: Any) => void} callback - (optional) called when the property is evaluated
  * @return {String} value of env var
  */
-function getSetting(node, name, flow_) {
+function getSetting(node, name, flow_, callback) {
+    const returnOrCallback = (err, result) => {
+        if (callback) {
+            callback(err, result);
+            return
+        }
+        return result;
+    }
     if (node) {
         if (name === "NR_NODE_NAME") {
-            return node.name;
+            return returnOrCallback(null, node.name);
         }
         if (name === "NR_NODE_ID") {
-            return node.id;
+            return returnOrCallback(null, node.id);
         }
         if (name === "NR_NODE_PATH") {
-            return node._path;
+            return returnOrCallback(null, node._path);
         }
     }
+
+    /** @type {RuntimeLibFlowsFlow} */
     var flow = (flow_ ? flow_ : (node ? node._flow : null));
     if (flow) {
         if (node && node.g) {
             const group = flow.getGroupNode(node.g);
-            const [result, newName] = flow.getGroupEnvSetting(node, group, name);
-            if (result) {
-                return result.val;
+            if (callback) {
+                flow.getGroupEnvSetting(node, group, name, (e, [result, newName]) => {
+                    if (e) {
+                        callback(e);
+                        return
+                    }
+                    if (result) {
+                        callback(null, result.val);
+                    }
+                    name = newName;
+                    flow.getSetting(name, callback);
+                });
+                return
+            } else {
+                const [result, newName] = flow.getGroupEnvSetting(node, group, name);
+                if (result) {
+                    return result.val;
+                }
+                name = newName;
             }
-            name = newName;
         }
-        return flow.getSetting(name);
+        const fVal = flow.getSetting(name, callback)
+        if (callback) {
+            return
+        }
+        return fVal;
     }
-    return process.env[name];
+    return returnOrCallback(null, process.env[name]);
 }
 
 
@@ -568,19 +599,34 @@ function getSetting(node, name, flow_) {
  * will return `Hello Joe!`.
  * @param  {String} value - the string to parse
  * @param  {Node} node - the node evaluating the property
+ * @param  {(err: Error, result: Any) => void} callback - (optional) called when the property is evaluated
  * @return {String} The parsed string
  * @memberof @node-red/util_util
  */
-function evaluateEnvProperty(value, node) {
+function evaluateEnvProperty(value, node, callback) {
+    const returnOrCallback = (err, result) => {
+        if (callback) {
+            callback(err, result);
+            return
+        }
+        return result;
+    }
+    /** @type {RuntimeLibFlowsFlow}  */
     var flow = (node && hasOwnProperty.call(node, "_flow")) ? node._flow : null;
     var result;
     if (/^\${[^}]+}$/.test(value)) {
         // ${ENV_VAR}
         var name = value.substring(2,value.length-1);
-        result = getSetting(node, name, flow);
+        result = getSetting(node, name, flow, callback);
+        if (callback) {
+            return
+        }
     } else if (!/\${\S+}/.test(value)) {
         // ENV_VAR
-        result = getSetting(node, value, flow);
+        result = getSetting(node, value, flow, callback);
+        if (callback) {
+            return
+        }
     } else {
         // FOO${ENV_VAR}BAR
         return value.replace(/\${([^}]+)}/g, function(match, name) {
@@ -588,8 +634,7 @@ function evaluateEnvProperty(value, node) {
             return (val === undefined)?"":val;
         });
     }
-    return (result === undefined)?"":result;
-
+    return returnOrCallback(null, (result === undefined)?"":result);
 }
 
 
@@ -677,7 +722,10 @@ function evaluateNodeProperty(value, type, node, msg, callback) {
             return
         }
     } else if (type === 'env') {
-        result = evaluateEnvProperty(value, node);
+        result = evaluateEnvProperty(value, node, callback);
+        if (callback) {
+            return
+        }
     }
     if (callback) {
         callback(null,result);