diff --git a/keyboards/handwired/onekey/keymaps/default_json/keymap.json b/keyboards/handwired/onekey/keymaps/default_json/keymap.json
new file mode 100644
index 00000000000..cf30f37b797
--- /dev/null
+++ b/keyboards/handwired/onekey/keymaps/default_json/keymap.json
@@ -0,0 +1,9 @@
+{
+ "keyboard":"handwired/onekey/pytest",
+ "keymap":"default_json",
+ "layout":"LAYOUT",
+ "layers":[["KC_A"]],
+ "author":"qmk",
+ "notes":"This file is a keymap.json file for handwired/onekey/pytest",
+ "version":1
+}
diff --git a/keyboards/handwired/onekey/pytest/templates/keymap.c b/keyboards/handwired/onekey/pytest/templates/keymap.c
index d355210c47f..6cb25d52263 100644
--- a/keyboards/handwired/onekey/pytest/templates/keymap.c
+++ b/keyboards/handwired/onekey/pytest/templates/keymap.c
@@ -1 +1,2 @@
+#include QMK_KEYBOARD_H
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {__KEYMAP_GOES_HERE__};
diff --git a/lib/python/qmk/cli/json2c.py b/lib/python/qmk/cli/json2c.py
index 52184050707..af0d80a9ac9 100755
--- a/lib/python/qmk/cli/json2c.py
+++ b/lib/python/qmk/cli/json2c.py
@@ -18,19 +18,19 @@ def json2c(cli):
     This command uses the `qmk.keymap` module to generate a keymap.c from a configurator export. The generated keymap is written to stdout, or to a file if -o is provided.
     """
     # Error checking
-    if not cli.args.filename.exists():
-        cli.log.error('JSON file does not exist!')
+    if cli.args.filename and cli.args.filename.name == '-':
+        # TODO(skullydazed/anyone): Read file contents from STDIN
+        cli.log.error('Reading from STDIN is not (yet) supported.')
         cli.print_usage()
         exit(1)
 
-    if cli.args.filename.name == '-':
-        # TODO(skullydazed/anyone): Read file contents from STDIN
-        cli.log.error('Reading from STDIN is not (yet) supported.')
+    if not cli.args.filename.exists():
+        cli.log.error('JSON file does not exist!')
         cli.print_usage()
         exit(1)
 
     # Environment processing
-    if cli.args.output.name == ('-'):
+    if cli.args.output and cli.args.output.name == '-':
         cli.args.output = None
 
     # Parse the configurator json
diff --git a/lib/python/qmk/tests/test_cli_commands.py b/lib/python/qmk/tests/test_cli_commands.py
index a93587150cc..768929de1d7 100644
--- a/lib/python/qmk/tests/test_cli_commands.py
+++ b/lib/python/qmk/tests/test_cli_commands.py
@@ -84,3 +84,9 @@ def test_list_keymaps_no_keyboard_found():
     result = check_subcommand('list-keymaps', '-kb', 'asdfghjkl')
     assert result.returncode == 0
     assert 'does not exist' in result.stdout
+
+
+def test_json2c():
+    result = check_subcommand('json2c', 'keyboards/handwired/onekey/keymaps/default_json/keymap.json')
+    assert result.returncode == 0
+    assert result.stdout == '#include QMK_KEYBOARD_H\nconst uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {\t[0] = LAYOUT(KC_A)};\n\n'
diff --git a/lib/python/qmk/tests/test_qmk_keymap.py b/lib/python/qmk/tests/test_qmk_keymap.py
index 2db625600e9..d8669e54985 100644
--- a/lib/python/qmk/tests/test_qmk_keymap.py
+++ b/lib/python/qmk/tests/test_qmk_keymap.py
@@ -8,12 +8,12 @@ def test_template_onekey_proton_c():
 
 def test_template_onekey_pytest():
     templ = qmk.keymap.template('handwired/onekey/pytest')
-    assert templ == 'const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {__KEYMAP_GOES_HERE__};\n'
+    assert templ == '#include QMK_KEYBOARD_H\nconst uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {__KEYMAP_GOES_HERE__};\n'
 
 
 def test_generate_onekey_pytest():
     templ = qmk.keymap.generate('handwired/onekey/pytest', 'LAYOUT', [['KC_A']])
-    assert templ == 'const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {	[0] = LAYOUT(KC_A)};\n'
+    assert templ == '#include QMK_KEYBOARD_H\nconst uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {\t[0] = LAYOUT(KC_A)};\n'
 
 
 # FIXME(skullydazed): Add a test for qmk.keymap.write that mocks up an FD.