diff --git a/datacontract/export/jsonschema_converter.py b/datacontract/export/jsonschema_converter.py
index 8299f02c..f219a150 100644
--- a/datacontract/export/jsonschema_converter.py
+++ b/datacontract/export/jsonschema_converter.py
@@ -46,9 +46,22 @@ def to_property(field: Field) -> dict:
     if field.unique:
         property["unique"] = True
     if json_type == "object":
-        property["properties"] = to_properties(field.fields)
+        # TODO: any better idea to distinguish between properties and patternProperties?
+        if next(iter(field.fields.keys())).startswith("^"):
+            property["patternProperties"] = to_properties(field.fields)
+        else:
+            property["properties"] = to_properties(field.fields)
         property["required"] = to_required(field.fields)
 
+    if field.pattern:
+        property["pattern"] = field.pattern
+    if field.enum:
+        property["enum"] = field.enum
+    if field.minLength:
+        property["minLength"] = field.minLength
+    if field.maxLength:
+        property["maxLength"] = field.maxLength
+    
     # TODO: all constraints
     return property
 
diff --git a/tests/fixtures/local-json-complex/data/sts_data.json b/tests/fixtures/local-json-complex/data/sts_data.json
new file mode 100644
index 00000000..14a06e25
--- /dev/null
+++ b/tests/fixtures/local-json-complex/data/sts_data.json
@@ -0,0 +1,15 @@
+{
+    "id": "11111111",
+    "sts_data": {
+        "connection_test": "SUCCESS",
+        "key_list": {
+            "0": {
+                "key": "12345678"
+            },
+            "1": {
+                "key": "23456789"
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/tests/fixtures/local-json-complex/datacontract.yaml b/tests/fixtures/local-json-complex/datacontract.yaml
new file mode 100644
index 00000000..25f275e5
--- /dev/null
+++ b/tests/fixtures/local-json-complex/datacontract.yaml
@@ -0,0 +1,53 @@
+dataContractSpecification: 0.9.3
+id: jsonschema-complex-data
+info:
+  title: sts data
+  version: 1.0.0
+  owner: Checkout Team
+models:
+  sts_data:
+    type: table
+    fields:
+      id:
+        type: string
+        minLength: 1
+        maxLength: 10
+        pattern: "^[0-9]{8}$"
+        required: true
+      sts_data:
+        type: object
+        required: true
+        fields:
+          connection_test:
+            type: string
+            enum: ["SUCCESS", "FAIL", "NULL"]
+            required: true
+          key_list:
+            type: object
+            required: true
+            fields:
+              ^[0-5]$:
+                type: object
+                fields:
+                  key:
+                    type: string
+                    pattern: "^[0-9]{8}$"
+                    required: true
+examples:
+  - type: json # csv, json, yaml, custom
+    model: sts_data
+    data: | # expressed as string or inline yaml or via "$ref: data.csv"
+      {
+        "id": "11111111",
+        "sts_data": {
+            "connection_test": "SUCCESS",
+            "key_list": {
+                "0": {
+                    "key": "12345678"
+                },
+                "1": {
+                    "key": "23456789"
+                }
+            }
+        }
+      }
\ No newline at end of file
diff --git a/tests/test_export_jsonschema.py b/tests/test_export_jsonschema.py
index 9b3f87d3..8855b5a1 100644
--- a/tests/test_export_jsonschema.py
+++ b/tests/test_export_jsonschema.py
@@ -48,13 +48,16 @@ def test_to_jsonschemas():
       "type": "string"
     },
     "1_Auspraegung_Code": {
-      "type": "string"
+      "type": "string",
+      "enum": ["DG"]
     },
     "1_Auspraegung_Label": {
-      "type": "string"
+      "type": "string",
+      "enum": ["Deutschland"]
     },
     "2_Merkmal_Code": {
-      "type": "string"
+      "type": "string",
+      "enum": ["MONAT"]
     },
     "2_Merkmal_Label": {
       "type": "string"
@@ -107,7 +110,6 @@ def test_to_jsonschemas():
 """
 
     result = to_jsonschemas(data_contract)
-
     assert result["verbraucherpreisindex"] == json.loads(expected_json_schema)
 
 
@@ -165,6 +167,69 @@ def test_to_jsonschemas_complex():
     assert result["inventory"] == json.loads(expected_json_schema)
 
 
+def test_to_jsonschemas_complex_2():
+    data_contract_file = "fixtures/local-json-complex/datacontract.yaml"
+    file_content = read_file(data_contract_file=data_contract_file)
+    data_contract = DataContractSpecification.from_string(file_content)
+    expected_json_schema = """{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "properties": {
+    "id": {
+      "type": "string",
+      "pattern": "^[0-9]{8}$",
+      "minLength": 1,
+      "maxLength": 10
+    },
+    "sts_data": {
+      "type": "object",
+      "properties": {
+        "connection_test": {
+          "type": "string",
+          "enum": [
+            "SUCCESS",
+            "FAIL",
+            "NULL"
+          ]
+        },
+        "key_list": {
+          "type": "object",
+          "patternProperties": {
+            "^[0-5]$": {
+              "type": [
+                "object",
+                "null"
+              ],
+              "properties": {
+                "key": {
+                  "type": "string",
+                  "pattern": "^[0-9]{8}$"
+                }
+              },
+              "required": [
+                "key"
+              ]
+            }
+          },
+          "required": []
+        }
+      },
+      "required": [
+        "connection_test",
+        "key_list"
+      ]
+    }
+  },
+  "required": [
+    "id",
+    "sts_data"
+  ]
+}
+"""
+    result = to_jsonschemas(data_contract)
+    assert result["sts_data"] == json.loads(expected_json_schema)
+
+
 def read_file(data_contract_file):
     if not os.path.exists(data_contract_file):
         print(f"The file '{data_contract_file}' does not exist.")