diff --git a/lib/ansible/plugins/filter/cast_type.py b/lib/ansible/plugins/filter/cast_type.py
new file mode 100644
index 0000000000..d9a6d2cfd2
--- /dev/null
+++ b/lib/ansible/plugins/filter/cast_type.py
@@ -0,0 +1,63 @@
+# Author Ken Celenza <ken@networktocode.com>
+# Author Jason Edelman <jason@networktocode.com>
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.errors import AnsibleError, AnsibleFilterError
+
+
+def cast_list_to_dict(data, key):
+    new_obj = {}
+
+    if not isinstance(data, list):
+        raise AnsibleFilterError("Type is not a valid list")
+    for item in data:
+        if not isinstance(item, dict):
+            raise AnsibleFilterError("List item is not a valid dict")
+        try:
+            key_elem = item.get(key)
+        except Exception as e:
+            raise AnsibleFilterError(str(e))
+        if new_obj.get(key_elem):
+            raise AnsibleFilterError("Key {0} is not unique, cannot correctly turn into dict".format(key_elem))
+        elif not key_elem:
+            raise AnsibleFilterError("Key {0} was not found".format(key))
+        else:
+            new_obj[key_elem] = item
+    return new_obj
+
+
+def cast_dict_to_list(data, key_name):
+    new_obj = []
+
+    if not isinstance(data, dict):
+        raise AnsibleFilterError("Type is not a valid dict")
+    for key, value in data.items():
+        if not isinstance(value, dict):
+            raise AnsibleFilterError("Type of key {0} value {1} is not a valid dict".format(key, value))
+        if value.get(key_name):
+            raise AnsibleFilterError("Key name {0} is already in use, cannot correctly turn into dict".format(key_name))
+        value[key_name] = key
+        new_obj.append(value)
+    return new_obj
+
+
+class FilterModule(object):
+    '''Convert a list to a dictionary provided a key that exists in all dicts.
+        If it does not, that dict is omitted
+    '''
+    def filters(self):
+        return {
+            'cast_list_to_dict': cast_list_to_dict,
+            'cast_dict_to_list': cast_dict_to_list,
+        }
+
+
+if __name__ == "__main__":
+    list_data = [{"proto": "eigrp", "state": "enabled"}, {"proto": "ospf", "state": "enabled"}]
+    print(cast_list_to_dict(list_data, 'proto'))
+
+    dict_data = {'eigrp': {'state': 'enabled', 'as': '1'}, 'ospf': {'state': 'enabled', 'as': '2'}}
+    print(cast_dict_to_list(dict_data, 'proto'))
diff --git a/test/units/plugins/filter/test_cast_types.py b/test/units/plugins/filter/test_cast_types.py
new file mode 100644
index 0000000000..2edaa40fe2
--- /dev/null
+++ b/test/units/plugins/filter/test_cast_types.py
@@ -0,0 +1,63 @@
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.compat.tests import unittest
+from ansible.plugins.filter.cast_type import (cast_list_to_dict, cast_dict_to_list)
+from ansible.errors import AnsibleError, AnsibleFilterError
+
+
+class TestTypeFilter(unittest.TestCase):
+    def test_cast_list_to_dict(self):
+        # Good test
+        list_original = [{"proto": "eigrp", "state": "enabled"}, {"proto": "ospf", "state": "enabled"}]
+        key = 'proto'
+        dict_return = {'eigrp': {'state': 'enabled', 'proto': 'eigrp'}, 'ospf': {'state': 'enabled', 'proto': 'ospf'}}
+        self.assertEqual(cast_list_to_dict(list_original, key), dict_return)
+
+        # Fail when key is not found
+        key = 'key_not_to_be_found'
+        self.assertRaisesRegexp(AnsibleFilterError, 'was not found', cast_list_to_dict, list_original, key)
+
+        # Fail when key is duplicated
+        list_original = [{"proto": "eigrp", "state": "enabled"}, {"proto": "ospf", "state": "enabled"}, {"proto": "ospf", "state": "enabled"}]
+        key = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, 'is not unique', cast_list_to_dict, list_original, key)
+
+        # Fail when list item is not a dict
+        list_original = [{"proto": "eigrp", "state": "enabled"}, "ospf"]
+        key = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, 'List item is not a valid dict', cast_list_to_dict, list_original, key)
+
+        # Fail when a non list is sent
+        list_original = {"proto": "eigrp", "state": "enabled"}
+        key = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, 'not a valid list', cast_list_to_dict, list_original, key)
+
+    def test_cast_dict_to_list(self):
+        # Good test
+        dict_original = {'eigrp': {'state': 'enabled', 'as': '1'}, 'ospf': {'state': 'enabled', 'as': '2'}}
+        key_name = 'proto'
+        list_return = [{'state': 'enabled', 'proto': 'ospf', 'as': '2'}, {'state': 'enabled', 'proto': 'eigrp', 'as': '1'}]
+        actual_return = cast_dict_to_list(dict_original, key_name)
+
+        try:
+            _assertItemsEqual = self.assertCountEqual
+            _assertItemsEqual(actual_return, list_return)
+        except AttributeError:
+            self.assertEqual(sorted(actual_return), sorted(list_return))
+
+        # Fail when dict key is already used
+        dict_original = {'eigrp': {'state': 'enabled', 'as': '1', 'proto': 'bgp'}, 'ospf': {'state': 'enabled', 'as': '2'}}
+        key_name = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, ' already in use, cannot correctly turn into dict', cast_dict_to_list, dict_original, key_name)
+
+        # Fail when sending a non-dict
+        dict_original = [{'eigrp': {'state': 'enabled', 'as': '1'}, 'ospf': {'state': 'enabled', 'as': '2'}}]
+        key_name = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, 'Type is not a valid dict', cast_dict_to_list, dict_original, key_name)
+
+        # Fail when dict value is not a dict
+        dict_original = {'eigrp': [{'state': 'enabled', 'as': '1'}], 'ospf': {'state': 'enabled', 'as': '2'}}
+        key_name = 'proto'
+        self.assertRaisesRegexp(AnsibleFilterError, 'Type of key', cast_dict_to_list, dict_original, key_name)