diff --git a/third_party/2and3/ujson.pyi b/third_party/2and3/ujson.pyi
new file mode 100644
index 000000000..147f67a56
--- /dev/null
+++ b/third_party/2and3/ujson.pyi
@@ -0,0 +1,45 @@
+# Stubs for ujson
+# See: https://pypi.python.org/pypi/ujson
+from typing import Any, IO, Optional
+
+__version__ = ...  # type: str
+
+def encode(obj: Any,
+    ensure_ascii: bool = ...,
+    double_precision: bool = ...,
+    encode_html_chars: bool = ...,
+    escape_forward_slashes: bool = ...,
+    sort_keys: bool = ...,
+    indent: int = ...,
+    ) -> str: ...
+
+def dumps(obj: Any,
+    ensure_ascii: bool = ...,
+    double_precision: bool = ...,
+    encode_html_chars: bool = ...,
+    escape_forward_slashes: bool = ...,
+    sort_keys: bool = ...,
+    indent: int = ...,
+    ) -> str: ...
+
+def dump(obj: Any,
+    fp: IO[str],
+    ensure_ascii: bool = ...,
+    double_precision: bool = ...,
+    encode_html_chars: bool = ...,
+    escape_forward_slashes: bool = ...,
+    sort_keys: bool = ...,
+    indent: int = ...,
+    ) -> None: ...
+
+def decode(s: str,
+    precise_float: bool = ...,
+    ) -> Any: ...
+
+def loads(s: str,
+    precise_float: bool = ...,
+    ) -> Any: ...
+
+def load(fp: IO[str],
+    precise_float: bool = ...,
+    ) -> Any: ...