diff --git a/packages/concerto-core/lib/introspect/decorator.js b/packages/concerto-core/lib/introspect/decorator.js
index 557be91b7..775d2d299 100644
--- a/packages/concerto-core/lib/introspect/decorator.js
+++ b/packages/concerto-core/lib/introspect/decorator.js
@@ -159,6 +159,25 @@ class Decorator {
                                 this.handleError(validationOptions.invalidDecorator, err);
                             }
                             break;
+                        case 'DecoratorJSON': {
+                            if (argType !== 'object') {
+                                const err = `Decorator ${this.getName()} has invalid decorator argument. Expected object for JSON. Found ${argType}, with value ${JSON.stringify(arg)}`;
+                                this.handleError(validationOptions.invalidator, err);
+                            }
+                            const keys = Object.keys(arg);
+                            keys.forEach(key => {
+                                if (typeof key !=='string') {
+                                    const err = `Decorator ${this.getName()} has an invalid key in the JSON object. Expected string, but found ${typeof key}.`;
+                                    this.handleError(validationOptions.invalidDecorator, err);
+                                }
+                                const valueType = typeof arg[key];
+                                if (!['string', 'number', 'boolean'].includes(valueType)) {
+                                    const err = `Decorator ${this.getName()} has an invalid value type in the JSON object, Expected string, number, or boolean, but found ${valueType} for key ${key}.`;
+                                    this.handleError(validationOptions.invalidDecorator, err);
+                                }
+                            });
+                            break;
+                        }
                         default: {
                             if (argType !== 'object' || arg?.type !== 'Identifier') {
                                 const err = `Decorator ${this.getName()} has invalid decorator argument. Expected object. Found ${argType}, with value ${JSON.stringify(arg)}`;
diff --git a/packages/concerto-cto/lib/parser.pegjs b/packages/concerto-cto/lib/parser.pegjs
index 845b74535..b0bf7a48c 100644
--- a/packages/concerto-cto/lib/parser.pegjs
+++ b/packages/concerto-cto/lib/parser.pegjs
@@ -918,11 +918,29 @@ DecoratorIdentifier =
       }
   }
 
+DecoratorJSON = 
+  "{" _ pairs:(KeyValue ("," _ KeyValue)*)? _ "}" {
+      return {
+        $class: "concerto.metamodel@1.0.0.DecoratorJSON",
+        value: pairs ? pairs.reduce(obj, pair) => {
+          obj[pair.key] = pair.value;
+          return obj;
+        }, {} : {},
+        ...buildRange(location())
+      };
+  }
+
+KeyValue = 
+  key:StringLiteral _ ":" _ value:DecoratorLiteral {
+    return { key: key.value, value:value };
+  }
+
 DecoratorLiteral =
   DecoratorString
   / DecoratorBoolean
   / DecoratorNumber
   / DecoratorIdentifier
+  / DecoratorJSON
 
 DecoratorArguments
   = "(" __ first:(d:DecoratorLiteral __ "," __ {return d;})* last:DecoratorLiteral? __ ")" {