diff --git a/README.md b/README.md
index 8c559bd..71f48a8 100644
--- a/README.md
+++ b/README.md
@@ -48,16 +48,16 @@ Custom options:
 --allocation_requirements=<requirements>                 Resource requirements to be allocate
 --allocation_timeout=<timeout>, default=10               Allocation timeout in seconds
 --allocation_resource_list_file=<filename>, default=resources.json 
-                                                         Resource to be allocate
---allocation_lock_folder=<folder>, default= os tmp path  allocation lock folder
+                                                         Available resorces list
+--allocation_lock_folder=<folder>, default=<os-tmp-path> allocation lockfiles folder
 ```
 
 *`<requirements>`* can be json-string or key-value pairs. requirements have to match available resources to make allocation possible. Key-value pairs example: `key=value&key2=value2` 
 
 Example:
+
+See [example test](example/test_example.py). Usage:
 ```
 cd example
 pytest --allocation_hostname localhost -s --allocation_lock_folder .  .
 ```
-
-
diff --git a/lockable/plugin.py b/lockable/plugin.py
index b0dfa6b..28d68f7 100644
--- a/lockable/plugin.py
+++ b/lockable/plugin.py
@@ -8,7 +8,7 @@
 from contextlib import contextmanager
 import tempfile
 import pytest
-from pydash import filter_, merge
+from pydash import filter_, merge, count_by
 from func_timeout import func_timeout, FunctionTimedOut
 from filelock import Timeout, FileLock
 
@@ -21,8 +21,8 @@ def pytest_addoption(parser):
     parser.addoption("--allocation_hostname", default=socket.gethostname(), help="Allocation host")
     parser.addoption("--allocation_requirements", default=None, help="Resource requirements to be allocate")
     parser.addoption("--allocation_timeout", default=10, help="Allocation timeout")
-    parser.addoption("--allocation_resource_list_file", default='resources.json', help="Resource to be allocate")
-    parser.addoption("--allocation_lock_folder", default=tempfile.gettempdir(), help="allocation lock folder")
+    parser.addoption("--allocation_resource_list_file", default='resources.json', help="Available resorces list")
+    parser.addoption("--allocation_lock_folder", default=tempfile.gettempdir(), help="Allocation lockfiles folder")
 
 
 def read_resources_list(filename):
@@ -30,9 +30,22 @@ def read_resources_list(filename):
     with open(filename) as json_file:
         data = json.load(json_file)
         assert isinstance(data, list), 'data is not an list'
+        validate_json(data)
     return data
 
 
+def validate_json(data):
+    counts = count_by(data, lambda obj: obj.get('id'))
+    no_ids = filter_(counts.keys(), lambda key: key is None)
+    if no_ids:
+        raise AssertionError('Invalid json, id property is missing')
+
+    duplicates = filter_(counts.keys(), lambda key: counts[key] > 1)
+    if duplicates:
+        print(duplicates)
+        raise AssertionError(f"Invalid json, duplicate ids in {duplicates}")
+
+
 def parse_requirements(requirements_str):
     """ Parse requirements """
     if not requirements_str:
@@ -70,7 +83,6 @@ def release():
                 os.remove(lock_file)
             except OSError as error:
                 print(error, file=sys.stderr)
-
         return candidate, release
     except Timeout:
         raise AssertionError('not success')
@@ -135,5 +147,5 @@ def test_foo(lockable_resource):
     print(f"Resource list: {json.dumps(resource_list)}")
     with lock(predicate, resource_list, timeout_s, lock_folder) as resource:
         for key, value in resource.items():
-            record_testsuite_property(key, value)
+            record_testsuite_property(f'resource_{key}', value)
         yield resource
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index 83c5cb3..3a65b51 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -11,7 +11,7 @@
 import multiprocessing as mp
 from tempfile import mktemp
 from contextlib import contextmanager
-from lockable.plugin import read_resources_list, parse_requirements, lock
+from lockable.plugin import read_resources_list, parse_requirements, lock, validate_json
 
 
 HOSTNAME = socket.gethostname()
@@ -135,3 +135,17 @@ def test_e2e(self):
             "--allocation_hostname", "localhost",
             join(example_root, "test_example.py")])
         self.assertEqual(exit_code, 0)
+
+    def test_valid_json(self):
+        data = [{"id": "12345"}]
+        validate_json(data)
+
+    def test_duplicate_id_in_json(self):
+        data = [{"id": "1234"}, {"id": "12345"}, {"id": "12345"}]
+        with self.assertRaises(AssertionError):
+            validate_json(data)
+
+    def test_missing_id_in_json(self):
+        data = [{"a": "1234"}, {"id": "12345"}, {"id": "123456"}]
+        with self.assertRaises(AssertionError):
+            validate_json(data)