diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
index 4d4eab84b..f0f3a073b 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
@@ -128,7 +128,7 @@ RED.editor = (function() {
      * @param definition - the node property definitions (either def.defaults or def.creds)
      * @param property - the property name being validated
      * @param value - the property value being validated
-     * @returns {boolean} whether the node proprty is valid
+     * @returns {boolean|string} whether the node proprty is valid. `true`: valid `false|String`: invalid
      */
     function validateNodeProperty(node,definition,property,value) {
         var valid = true;
@@ -165,6 +165,10 @@ RED.editor = (function() {
                 if ((definition[property].validate.length === 2) &&
                     ((typeof valid) === "string")) {
                     return valid;
+                } else {
+                    // Otherwise, a 2.x returns a truth-like/false-like value that
+                    // we should cooerce to a boolean.
+                    valid = !!valid
                 }
             } catch(err) {
                 console.log("Validation error:",node.type,node.id,"property: "+property,"value:",value,err);
diff --git a/packages/node_modules/@node-red/nodes/core/common/20-inject.html b/packages/node_modules/@node-red/nodes/core/common/20-inject.html
index 9f4ee07e0..4811d3ae5 100644
--- a/packages/node_modules/@node-red/nodes/core/common/20-inject.html
+++ b/packages/node_modules/@node-red/nodes/core/common/20-inject.html
@@ -230,17 +230,21 @@
                     for (var i=0;i<v.length;i++) {
                         if (/msg|flow|global/.test(v[i].vt)) {
                             if (!RED.utils.validatePropertyExpression(v[i].v)) {
-                                return RED._("node-red:inject.errors.invalid-prop", { prop: v[i].p, error: v[i].v });
+                                return RED._("node-red:inject.errors.invalid-prop", { prop: 'msg.'+v[i].p, error: v[i].v });
                             }
                         } else if (v[i].vt === "jsonata") {
                             try{ jsonata(v[i].v); }
                             catch(e){
-                                return RED._("node-red:inject.errors.invalid-jsonata", { prop: v[i].p, error: e.message });
+                                return RED._("node-red:inject.errors.invalid-jsonata", { prop: 'msg.'+v[i].p, error: e.message });
                             }
                         } else if (v[i].vt === "json") {
                             try{ JSON.parse(v[i].v); }
                             catch(e){
-                                return RED._("node-red:inject.errors.invalid-json", { prop: v[i].p, error: e.message });
+                                return RED._("node-red:inject.errors.invalid-json", { prop: 'msg.'+v[i].p, error: e.message });
+                            }
+                        } else if (v[i].vt === "num"){
+                            if (!/^[+-]?[0-9]*\.?[0-9]*([eE][-+]?[0-9]+)?$/.test(v[i].v)) {
+                                return RED._("node-red:inject.errors.invalid-prop", { prop: 'msg.'+v[i].p, error: v[i].v });
                             }
                         }
                     }
diff --git a/packages/node_modules/@node-red/nodes/locales/en-US/messages.json b/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
index 134c7019e..db36b8e0f 100755
--- a/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
+++ b/packages/node_modules/@node-red/nodes/locales/en-US/messages.json
@@ -86,10 +86,10 @@
             "failed": "inject failed, see log for details",
             "toolong": "Interval too large",
             "invalid-expr": "Invalid JSONata expression: __error__",
-	    "invalid-jsonata": "__prop__: invalid property expression: __error__",
-	    "invalid-prop": "__prop__: invalid property expression: __error__",
-	    "invalid-json": "__prop__: invalid JSON data: __error__",
-	    "invalid-repeat": "Invalid repeat value"
+            "invalid-jsonata": "__prop__: invalid property expression: __error__",
+            "invalid-prop": "__prop__: invalid property expression: __error__",
+            "invalid-json": "__prop__: invalid JSON data: __error__",
+            "invalid-repeat": "Invalid repeat value"
         }
     },
     "catch": {