diff --git a/manager/api/migrations/0010_auto_20220914_1542.py b/manager/api/migrations/0010_auto_20220914_1542.py
new file mode 100644
index 00000000..85545a05
--- /dev/null
+++ b/manager/api/migrations/0010_auto_20220914_1542.py
@@ -0,0 +1,37 @@
+# Generated by Django 3.1.14 on 2022-09-14 15:42
+
+import api.models
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("api", "0009_configfile_selected_by_users"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="configfile",
+            name="config_file",
+            field=models.FileField(
+                default="configs/default.json",
+                upload_to="configs/",
+                validators=[
+                    api.models.ConfigFile.validate_file_extension,
+                    api.models.ConfigFile.validate_json_file,
+                ],
+            ),
+        ),
+        migrations.AlterField(
+            model_name="configfile",
+            name="selected_by_users",
+            field=models.ManyToManyField(
+                blank=True,
+                related_name="selected_config_file",
+                to=settings.AUTH_USER_MODEL,
+            ),
+        ),
+    ]
diff --git a/manager/api/models.py b/manager/api/models.py
index 95fb7241..211b5f3f 100644
--- a/manager/api/models.py
+++ b/manager/api/models.py
@@ -5,6 +5,7 @@
 https://docs.djangoproject.com/en/2.2/topics/db/models/
 """
 import os
+import json
 from django.conf import settings
 from django.db import models
 from django.db.models import F
@@ -82,10 +83,16 @@ class ConfigFile(BaseModel):
 
     def validate_file_extension(value):
         ext = os.path.splitext(value.name)[1]  # [0] returns path+filename
-        valid_extensions = [".json", ".sh"]
+        valid_extensions = [".json"]
         if not ext.lower() in valid_extensions:
             raise ValidationError("Unsupported file extension.")
 
+    def validate_json_file(value):
+        try:
+            json.loads(value.read().decode("ascii"))
+        except Exception:
+            raise ValidationError("Malformatted JSON object.")
+
     user = models.ForeignKey(
         settings.AUTH_USER_MODEL,
         related_name="config_files",
@@ -100,12 +107,12 @@ def validate_file_extension(value):
     config_file = models.FileField(
         upload_to="configs/",
         default="configs/default.json",
-        validators=[validate_file_extension],
+        validators=[validate_file_extension, validate_json_file],
     )
     """Reference to the config file"""
 
     selected_by_users = models.ManyToManyField(
-        settings.AUTH_USER_MODEL, related_name="selected_config_file"
+        settings.AUTH_USER_MODEL, related_name="selected_config_file", blank=True,
     )
 
 
diff --git a/manager/api/serializers.py b/manager/api/serializers.py
index 5483dfc8..2eae6072 100644
--- a/manager/api/serializers.py
+++ b/manager/api/serializers.py
@@ -75,7 +75,7 @@ class TimeDataSerializer(serializers.Serializer):
 
 
 class ConfigSerializer(serializers.Serializer):
-    """Custom Serializer to describe the confi file field for the Apidocs."""
+    """Custom Serializer to describe the config file field for the Apidocs."""
 
     config_file = serializers.JSONField()