diff --git a/projects/simplejson/fuzz_encode.py b/projects/simplejson/fuzz_encode.py
new file mode 100644
index 000000000..5e68e38b0
--- /dev/null
+++ b/projects/simplejson/fuzz_encode.py
@@ -0,0 +1,42 @@
+#!/usr/bin/python3
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+import atheris
+import simplejson
+
+
+def TestOneInput(data):
+  fdp = atheris.FuzzedDataProvider(data)
+  original = fdp.ConsumeUnicodeNoSurrogates(sys.maxsize)
+  encoder = simplejson.JSONEncoder()
+  try:
+    # Anything that can be decoded shold be able to be encoded
+    encoder.encode(simplejson.loads(original))
+  except simplejson.JSONDecodeError:
+    pass
+  except RecursionError:
+    pass
+  return
+
+
+def main():
+  atheris.instrument_all()
+  atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
+  atheris.Fuzz()
+
+
+if __name__ == "__main__":
+  main()