diff --git a/problems/factorial.json b/problems/factorial.json
new file mode 100644
index 0000000..ec9d813
--- /dev/null
+++ b/problems/factorial.json
@@ -0,0 +1,7 @@
+[
+  { "input": [0], "expected": 1 },
+  { "input": [1], "expected": 1 },
+  { "input": [5], "expected": 120 },
+  { "input": [7], "expected": 5040 },
+  { "input": [10], "expected": 3628800 }
+]