diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index a58035c6..06b8d1c5 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -5,6 +5,7 @@
 **Fixed**
 
 - fix: avoid '.csv' been converted to '_csv'
+- fix: convert har to JSON format testcase
 
 ## 3.0.12 (2020-06-14)
 
diff --git a/httprunner/ext/har2case/__init__.py b/httprunner/ext/har2case/__init__.py
index c1a074b4..4a503962 100644
--- a/httprunner/ext/har2case/__init__.py
+++ b/httprunner/ext/har2case/__init__.py
@@ -67,7 +67,7 @@ def main_har2case(args):
 
     if args.to_yaml:
         output_file_type = "YAML"
-    elif args.to_yaml:
+    elif args.to_json:
         output_file_type = "JSON"
     else:
         output_file_type = "pytest"
diff --git a/httprunner/ext/har2case/core.py b/httprunner/ext/har2case/core.py
index 3c491cf5..acb62951 100644
--- a/httprunner/ext/har2case/core.py
+++ b/httprunner/ext/har2case/core.py
@@ -338,8 +338,6 @@ class HarParser(object):
             capture_exception(ex)
             raise
 
-        logger.debug("prepared testcase: {}".format(testcase))
-
         if file_type == "JSON":
             output_testcase_file = f"{harfile}.json"
             utils.dump_json(testcase, output_testcase_file)