diff --git a/swh/web/admin/deposit.py b/swh/web/admin/deposit.py
--- a/swh/web/admin/deposit.py
+++ b/swh/web/admin/deposit.py
@@ -3,16 +3,14 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import json
-import requests
-
 from django.core.cache import cache
 from django.conf import settings
 from django.contrib.admin.views.decorators import staff_member_required
 from django.core.paginator import Paginator
-from django.http import HttpResponse
+from django.http import JsonResponse
 from django.shortcuts import render
 
+import requests
 from requests.auth import HTTPBasicAuth
 import sentry_sdk
 
@@ -108,4 +106,4 @@
             "An error occurred while retrieving " "the list of deposits !"
         )
 
-    return HttpResponse(json.dumps(table_data), content_type="application/json")
+    return JsonResponse(table_data)
diff --git a/swh/web/admin/origin_save.py b/swh/web/admin/origin_save.py
--- a/swh/web/admin/origin_save.py
+++ b/swh/web/admin/origin_save.py
@@ -3,13 +3,11 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import json
-
 from django.conf import settings
 from django.contrib.admin.views.decorators import staff_member_required
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.paginator import Paginator
-from django.http import HttpResponse
+from django.http import HttpResponse, JsonResponse
 from django.shortcuts import render
 from django.views.decorators.http import require_POST
 
@@ -56,8 +54,7 @@
     paginator = Paginator(urls_query_set, length)
     urls_query_set = paginator.page(page).object_list
     table_data["data"] = [{"url": u.url} for u in urls_query_set]
-    table_data_json = json.dumps(table_data, separators=(",", ": "))
-    return HttpResponse(table_data_json, content_type="application/json")
+    return JsonResponse(table_data)
 
 
 @admin_route(
diff --git a/swh/web/browse/views/content.py b/swh/web/browse/views/content.py
--- a/swh/web/browse/views/content.py
+++ b/swh/web/browse/views/content.py
@@ -4,11 +4,10 @@
 # See top-level LICENSE file for more information
 
 import difflib
-import json
 
 from distutils.util import strtobool
 
-from django.http import HttpResponse
+from django.http import HttpResponse, JsonResponse
 from django.shortcuts import render
 from django.template.defaultfilters import filesizeformat
 import sentry_sdk
@@ -174,8 +173,7 @@
 
     diff_data["diff_str"] = diff_str
     diff_data["language"] = language
-    diff_data_json = json.dumps(diff_data, separators=(",", ": "))
-    return HttpResponse(diff_data_json, content_type="application/json")
+    return JsonResponse(diff_data)
 
 
 @browse_route(
diff --git a/swh/web/browse/views/revision.py b/swh/web/browse/views/revision.py
--- a/swh/web/browse/views/revision.py
+++ b/swh/web/browse/views/revision.py
@@ -7,7 +7,7 @@
 import json
 import textwrap
 
-from django.http import HttpResponse
+from django.http import JsonResponse
 from django.shortcuts import render
 from django.template.defaultfilters import filesizeformat
 from django.utils.safestring import mark_safe
@@ -187,8 +187,7 @@
         "changes": changes[:_max_displayed_file_diffs],
         "changes_msg": changes_msg,
     }
-    diff_data_json = json.dumps(diff_data, separators=(",", ": "))
-    return HttpResponse(diff_data_json, content_type="application/json")
+    return JsonResponse(diff_data)
 
 
 NB_LOG_ENTRIES = 100
diff --git a/swh/web/misc/coverage.py b/swh/web/misc/coverage.py
--- a/swh/web/misc/coverage.py
+++ b/swh/web/misc/coverage.py
@@ -3,11 +3,9 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import json
-
 from django.conf.urls import url
 from django.core.cache import caches
-from django.http import HttpResponse
+from django.http import JsonResponse
 from django.shortcuts import render
 from django.views.decorators.cache import never_cache
 from django.views.decorators.clickjacking import xframe_options_exempt
@@ -203,11 +201,10 @@
                     "origin_types": code_provider["origin_types"],
                 }
             )
-        results = json.dumps(results)
     except Exception as exc:
         return handle_view_exception(request, exc, html_response=False)
 
-    return HttpResponse(results, content_type="application/json")
+    return JsonResponse(results)
 
 
 urlpatterns = [
diff --git a/swh/web/misc/origin_save.py b/swh/web/misc/origin_save.py
--- a/swh/web/misc/origin_save.py
+++ b/swh/web/misc/origin_save.py
@@ -3,11 +3,9 @@
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import json
-
 from django.conf.urls import url
 from django.core.paginator import Paginator
-from django.http import HttpResponse, HttpResponseForbidden, HttpResponseServerError
+from django.http import JsonResponse
 from django.shortcuts import render
 
 from rest_framework.decorators import api_view, authentication_classes
@@ -42,23 +40,17 @@
     per user to avoid being possibly flooded by bots.
     """
     try:
-        response = json.dumps(
-            create_save_origin_request(visit_type, origin_url), separators=(",", ": ")
-        )
-        return HttpResponse(response, content_type="application/json")
+        response = create_save_origin_request(visit_type, origin_url)
+        return JsonResponse(response)
     except ForbiddenExc as exc:
-        return HttpResponseForbidden(
-            json.dumps({"detail": str(exc)}), content_type="application/json"
-        )
+        return JsonResponse({"detail": str(exc)}, status=403)
     except Exception as exc:
-        return HttpResponseServerError(
-            json.dumps({"detail": str(exc)}), content_type="application/json"
-        )
+        return JsonResponse({"detail": str(exc)}, status=500)
 
 
 def _visit_save_types_list(request):
-    visit_types = json.dumps(get_savable_visit_types(), separators=(",", ": "))
-    return HttpResponse(visit_types, content_type="application/json")
+    visit_types = get_savable_visit_types()
+    return JsonResponse(visit_types, safe=False)
 
 
 def _origin_save_requests_list(request, status):
@@ -98,8 +90,7 @@
     table_data["recordsFiltered"] = len(save_requests)
     paginator = Paginator(save_requests, length)
     table_data["data"] = paginator.page(page).object_list
-    table_data_json = json.dumps(table_data, separators=(",", ": "))
-    return HttpResponse(table_data_json, content_type="application/json")
+    return JsonResponse(table_data)
 
 
 def _save_origin_task_info(request, save_request_id):
@@ -109,7 +100,7 @@
     for date_field in ("scheduled", "started", "ended"):
         if date_field in request_info and request_info[date_field] is not None:
             request_info[date_field] = request_info[date_field].isoformat()
-    return HttpResponse(json.dumps(request_info), content_type="application/json")
+    return JsonResponse(request_info)
 
 
 urlpatterns = [
diff --git a/swh/web/misc/urls.py b/swh/web/misc/urls.py
--- a/swh/web/misc/urls.py
+++ b/swh/web/misc/urls.py
@@ -10,7 +10,7 @@
 
 from django.conf.urls import url, include
 from django.contrib.staticfiles import finders
-from django.http import HttpResponse
+from django.http import JsonResponse
 from django.shortcuts import render
 
 from swh.web.common import service
@@ -28,7 +28,7 @@
 
 
 def _stat_counters(request):
-    stat = service.stat_counters()
+    stat_counters = service.stat_counters()
     url = get_config()["history_counters_url"]
     stat_counters_history = "null"
     if url:
@@ -37,11 +37,11 @@
             stat_counters_history = response.text
         except Exception as exc:
             sentry_sdk.capture_exception(exc)
-    json_data = '{"stat_counters": %s, "stat_counters_history": %s}' % (
-        json.dumps(stat),
-        stat_counters_history,
-    )
-    return HttpResponse(json_data, content_type="application/json")
+    counters = {
+        "stat_counters": stat_counters,
+        "stat_counters_history": stat_counters_history,
+    }
+    return JsonResponse(counters)
 
 
 urlpatterns = [