diff --git a/contrib/test-schema.py b/contrib/test-schema.py
new file mode 100644
index 0000000..ebf0e51
--- /dev/null
+++ b/contrib/test-schema.py
@@ -0,0 +1,27 @@
+"""Check if a file's JSON message passes the given schema."""
+import simplejson
+import sys
+from jsonschema import FormatChecker, ValidationError
+from jsonschema import validate as json_validate
+
+if len(sys.argv) < 2:
+    print(
+f"""
+Usage: {sys.argv[0]} <schema file name> <test data file name>
+
+Note that the entire file will be loaded by simpljson.load() and should
+only contain one JSON object.
+"""
+    )
+    sys.exit(-1)
+
+schema_file_name = sys.argv[1]
+test_file_name = sys.argv[2]
+
+with open(test_file_name, 'r') as test_file:
+    test_event = simplejson.load(test_file)
+
+    with open(schema_file_name, 'r') as schema_file:
+        schema = simplejson.load(schema_file)
+
+    json_validate(test_event, schema, format_checker=FormatChecker())