diff --git a/src/vws/_json_utils.py b/src/vws/_json_utils.py
index 9d827ed62..09575bffb 100644
--- a/src/vws/_json_utils.py
+++ b/src/vws/_json_utils.py
@@ -3,21 +3,25 @@
 import json
 from typing import TypeGuard
 
+from beartype import beartype
 from beartype.door import TypeHint
 
 from vws.json_types import JSONValue
 
 
+@beartype
 def _is_json_object(value: object, /) -> TypeGuard[dict[str, JSONValue]]:
     """Return whether a decoded JSON value is an object."""
     return TypeHint(hint=dict[str, JSONValue]).is_bearable(obj=value)
 
 
+@beartype
 def _is_object_list(value: object, /) -> TypeGuard[list[JSONValue]]:
     """Return whether a decoded JSON value is an array."""
     return TypeHint(hint=list[JSONValue]).is_bearable(obj=value)
 
 
+@beartype
 def _validated_object(*, value: object) -> dict[str, JSONValue]:
     """Return a decoded JSON object."""
     if not _is_json_object(value):
@@ -26,12 +30,14 @@ def _validated_object(*, value: object) -> dict[str, JSONValue]:
     return value
 
 
+@beartype
 def json_object(*, value: str | bytes | bytearray) -> dict[str, JSONValue]:
     """Decode and validate a JSON object."""
     loaded: object = json.loads(s=value)
     return _validated_object(value=loaded)
 
 
+@beartype
 def object_field(
     *, value: dict[str, JSONValue], name: str
 ) -> dict[str, JSONValue]:
@@ -39,6 +45,7 @@ def object_field(
     return _validated_object(value=value[name])
 
 
+@beartype
 def string_value(*, value: object, name: str) -> str:
     """Return a JSON value after validating that it is a string."""
     if not isinstance(value, str):
@@ -47,11 +54,13 @@ def string_value(*, value: object, name: str) -> str:
     return value
 
 
+@beartype
 def string_field(*, value: dict[str, JSONValue], name: str) -> str:
     """Return a required string field from a JSON object."""
     return string_value(value=value[name], name=name)
 
 
+@beartype
 def string_list_field(
     *,
     value: dict[str, JSONValue],
@@ -67,6 +76,7 @@ def string_list_field(
     return [item for item in items if isinstance(item, str)]
 
 
+@beartype
 def object_list_field(
     *,
     value: dict[str, JSONValue],
diff --git a/src/vws/exceptions/vws_exceptions.py b/src/vws/exceptions/vws_exceptions.py
index bd42ae7b8..f1631356f 100644
--- a/src/vws/exceptions/vws_exceptions.py
+++ b/src/vws/exceptions/vws_exceptions.py
@@ -14,6 +14,7 @@
 from vws.exceptions.base_exceptions import VWSError
 
 
+@beartype
 def _target_id_from_url(*, url: str) -> str:
     """Return the target ID from a VWS response URL.
 
diff --git a/src/vws/reports.py b/src/vws/reports.py
index 9aaa739e3..a99d933ff 100644
--- a/src/vws/reports.py
+++ b/src/vws/reports.py
@@ -27,6 +27,7 @@ def _is_type[T](value: object, hint: type[T], /) -> TypeIs[T]:
     return TypeHint(hint=hint).is_bearable(obj=value)
 
 
+@beartype
 def _number(value: object, /) -> int | float:
     """Return a runtime-validated JSON number."""
     if isinstance(value, bool) or not isinstance(value, int | float):
@@ -35,6 +36,7 @@ def _number(value: object, /) -> int | float:
     return value
 
 
+@beartype
 def _optional_string(value: object, /) -> str | None:
     """Return a runtime-validated optional string."""
     if value is not None and not isinstance(value, str):