diff --git a/app/api/__init__.py b/app/api/__init__.py
index a3c77eb976..bb8f6cc5c4 100644
--- a/app/api/__init__.py
+++ b/app/api/__init__.py
@@ -1,8 +1,8 @@
 """api.__init__
 """
-
+from flask_json import as_json
 from flask import Blueprint
-from flask import request, g, jsonify
+from flask import request, g
 from app import db
 from app.scodoc import sco_utils as scu
 from app.scodoc.sco_exceptions import ScoException
@@ -35,6 +35,7 @@ def requested_format(default_format="json", allowed_formats=None):
     return None
 
 
+@as_json
 def get_model_api_object(model_cls: db.Model, model_id: int, join_cls: db.Model = None):
     """
     Retourne une réponse contenant la représentation api de l'objet "Model[model_id]"
@@ -48,7 +49,7 @@ def get_model_api_object(model_cls: db.Model, model_id: int, join_cls: db.Model
         query = query.join(join_cls).filter_by(dept_id=g.scodoc_dept_id)
     unique: model_cls = query.first_or_404()
 
-    return jsonify(unique.to_dict(format_api=True))
+    return unique.to_dict(format_api=True)
 
 
 from app.api import tokens
diff --git a/app/api/assiduites.py b/app/api/assiduites.py
index 5853e3ff0f..17ccf816c4 100644
--- a/app/api/assiduites.py
+++ b/app/api/assiduites.py
@@ -6,7 +6,8 @@
 """ScoDoc 9 API : Assiduités
 """
 from datetime import datetime
-from flask import g, jsonify, request
+from flask_json import as_json
+from flask import g, request
 from flask_login import login_required, current_user
 
 import app.scodoc.sco_assiduites as scass
@@ -52,6 +53,7 @@ def assiduite(assiduite_id: int = None):
 @api_web_bp.route("/assiduites/<int:etudid>/count/query", defaults={"with_query": True})
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def count_assiduites(etudid: int = None, with_query: bool = False):
     """
@@ -109,10 +111,8 @@ def count_assiduites(etudid: int = None, with_query: bool = False):
     if with_query:
         metric, filtered = _count_manager(request)
 
-    return jsonify(
-        scass.get_assiduites_stats(
-            assiduites=etud.assiduites, metric=metric, filtered=filtered
-        )
+    return scass.get_assiduites_stats(
+        assiduites=etud.assiduites, metric=metric, filtered=filtered
     )
 
 
@@ -122,6 +122,7 @@ def count_assiduites(etudid: int = None, with_query: bool = False):
 @api_web_bp.route("/assiduites/<int:etudid>/query", defaults={"with_query": True})
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def assiduites(etudid: int = None, with_query: bool = False):
     """
@@ -178,13 +179,14 @@ def assiduites(etudid: int = None, with_query: bool = False):
         data = ass.to_dict(format_api=True)
         data_set.append(data)
 
-    return jsonify(data_set)
+    return data_set
 
 
 @bp.route("/assiduites/group/query", defaults={"with_query": True})
 @api_web_bp.route("/assiduites/group/query", defaults={"with_query": True})
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def assiduites_group(with_query: bool = False):
     """
@@ -252,7 +254,7 @@ def assiduites_group(with_query: bool = False):
         data = ass.to_dict(format_api=True)
         data_set.get(data["etudid"]).append(data)
 
-    return jsonify(data_set)
+    return data_set
 
 
 @bp.route(
@@ -271,6 +273,7 @@ def assiduites_group(with_query: bool = False):
 )
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def assiduites_formsemestre(formsemestre_id: int, with_query: bool = False):
     """Retourne toutes les assiduités du formsemestre"""
@@ -291,7 +294,7 @@ def assiduites_formsemestre(formsemestre_id: int, with_query: bool = False):
         data = ass.to_dict(format_api=True)
         data_set.append(data)
 
-    return jsonify(data_set)
+    return data_set
 
 
 @bp.route(
@@ -312,6 +315,7 @@ def assiduites_formsemestre(formsemestre_id: int, with_query: bool = False):
 )
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def count_assiduites_formsemestre(
     formsemestre_id: int = None, with_query: bool = False
@@ -334,12 +338,13 @@ def count_assiduites_formsemestre(
     if with_query:
         metric, filtered = _count_manager(request)
 
-    return jsonify(scass.get_assiduites_stats(assiduites_query, metric, filtered))
+    return scass.get_assiduites_stats(assiduites_query, metric, filtered)
 
 
 @bp.route("/assiduite/<int:etudid>/create", methods=["POST"])
 @api_web_bp.route("/assiduite/<int:etudid>/create", methods=["POST"])
 @scodoc
+@as_json
 @login_required
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
@@ -382,12 +387,13 @@ def assiduite_create(etudid: int = None):
 
     db.session.commit()
 
-    return jsonify({"errors": errors, "success": success})
+    return {"errors": errors, "success": success}
 
 
 @bp.route("/assiduites/create", methods=["POST"])
 @api_web_bp.route("/assiduites/create", methods=["POST"])
 @scodoc
+@as_json
 @login_required
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
@@ -435,7 +441,7 @@ def assiduites_create():
         else:
             success[i] = obj
 
-    return jsonify({"errors": errors, "success": success})
+    return {"errors": errors, "success": success}
 
 
 def _create_singular(
@@ -515,6 +521,7 @@ def _create_singular(
 @api_web_bp.route("/assiduite/delete", methods=["POST"])
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def assiduite_delete():
@@ -543,7 +550,7 @@ def assiduite_delete():
         else:
             output["success"][f"{i}"] = {"OK": True}
     db.session.commit()
-    return jsonify(output)
+    return output
 
 
 def _delete_singular(assiduite_id: int, database):
@@ -558,6 +565,7 @@ def _delete_singular(assiduite_id: int, database):
 @api_web_bp.route("/assiduite/<int:assiduite_id>/edit", methods=["POST"])
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def assiduite_edit(assiduite_id: int):
@@ -625,13 +633,14 @@ def assiduite_edit(assiduite_id: int):
 
     db.session.add(assiduite_unique)
     db.session.commit()
-    return jsonify({"OK": True})
+    return {"OK": True}
 
 
 @bp.route("/assiduites/edit", methods=["POST"])
 @api_web_bp.route("/assiduites/edit", methods=["POST"])
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def assiduites_edit():
@@ -666,7 +675,7 @@ def assiduites_edit():
 
     db.session.commit()
 
-    return jsonify({"errors": errors, "success": success})
+    return {"errors": errors, "success": success}
 
 
 def _edit_singular(assiduite_unique, data):
diff --git a/app/api/justificatifs.py b/app/api/justificatifs.py
index 6228bcf867..e2cfe61ebd 100644
--- a/app/api/justificatifs.py
+++ b/app/api/justificatifs.py
@@ -7,6 +7,7 @@
 """
 from datetime import datetime
 
+from flask_json import as_json
 from flask import g, jsonify, request
 from flask_login import login_required, current_user
 
@@ -57,6 +58,7 @@ def justificatif(justif_id: int = None):
 @api_web_bp.route("/justificatifs/<int:etudid>/query", defaults={"with_query": True})
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 def justificatifs(etudid: int = None, with_query: bool = False):
     """
@@ -100,13 +102,14 @@ def justificatifs(etudid: int = None, with_query: bool = False):
         data = just.to_dict(format_api=True)
         data_set.append(data)
 
-    return jsonify(data_set)
+    return data_set
 
 
 @bp.route("/justificatif/<int:etudid>/create", methods=["POST"])
 @api_web_bp.route("/justificatif/<int:etudid>/create", methods=["POST"])
 @scodoc
 @login_required
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_create(etudid: int = None):
@@ -145,7 +148,7 @@ def justif_create(etudid: int = None):
         else:
             success[i] = obj
     compute_assiduites_justified(Justificatif.query.filter_by(etudid=etudid), True)
-    return jsonify({"errors": errors, "success": success})
+    return {"errors": errors, "success": success}
 
 
 def _create_singular(
@@ -221,6 +224,7 @@ def _create_singular(
 @api_web_bp.route("/justificatif/<int:justif_id>/edit", methods=["POST"])
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_edit(justif_id: int):
@@ -296,23 +300,22 @@ def justif_edit(justif_id: int):
     db.session.add(justificatif_unique)
     db.session.commit()
 
-    return jsonify(
-        {
-            "couverture": {
-                "avant": avant_ids,
-                "après": compute_assiduites_justified(
-                    Justificatif.query.filter_by(etudid=justificatif_unique.etudid),
-                    True,
-                ),
-            }
+    return {
+        "couverture": {
+            "avant": avant_ids,
+            "après": compute_assiduites_justified(
+                Justificatif.query.filter_by(etudid=justificatif_unique.etudid),
+                True,
+            ),
         }
-    )
+    }
 
 
 @bp.route("/justificatif/delete", methods=["POST"])
 @api_web_bp.route("/justificatif/delete", methods=["POST"])
 @login_required
 @scodoc
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_delete():
@@ -342,7 +345,7 @@ def justif_delete():
             output["success"][f"{i}"] = {"OK": True}
     db.session.commit()
 
-    return jsonify(output)
+    return output
 
 
 def _delete_singular(justif_id: int, database):
@@ -371,6 +374,7 @@ def _delete_singular(justif_id: int, database):
 @api_web_bp.route("/justificatif/<int:justif_id>/import", methods=["POST"])
 @scodoc
 @login_required
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_import(justif_id: int = None):
@@ -407,7 +411,7 @@ def justif_import(justif_id: int = None):
         db.session.add(justificatif_unique)
         db.session.commit()
 
-        return jsonify({"filename": fname})
+        return {"filename": fname}
     except ScoValueError as err:
         return json_error(404, err.args[0])
 
@@ -447,6 +451,7 @@ def justif_export(justif_id: int = None, filename: str = None):
 @api_web_bp.route("/justificatif/<int:justif_id>/remove", methods=["POST"])
 @scodoc
 @login_required
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_remove(justif_id: int = None):
@@ -504,13 +509,14 @@ def justif_remove(justif_id: int = None):
     except ScoValueError as err:
         return json_error(404, err.args[0])
 
-    return jsonify({"response": "removed"})
+    return {"response": "removed"}
 
 
 @bp.route("/justificatif/<int:justif_id>/list", methods=["GET"])
 @api_web_bp.route("/justificatif/<int:justif_id>/list", methods=["GET"])
 @scodoc
 @login_required
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_list(justif_id: int = None):
@@ -534,7 +540,7 @@ def justif_list(justif_id: int = None):
             archive_name, justificatif_unique.etudid
         )
 
-    return jsonify(filenames)
+    return filenames
 
 
 # Partie justification
@@ -542,6 +548,7 @@ def justif_list(justif_id: int = None):
 @api_web_bp.route("/justificatif/<int:justif_id>/justifies", methods=["GET"])
 @scodoc
 @login_required
+@as_json
 @permission_required(Permission.ScoView)
 # @permission_required(Permission.ScoAssiduiteChange)
 def justif_justifies(justif_id: int = None):
@@ -557,7 +564,7 @@ def justif_justifies(justif_id: int = None):
 
     assiduites_list: list[int] = scass.justifies(justificatif_unique)
 
-    return jsonify(assiduites_list)
+    return assiduites_list
 
 
 # -- Utils --
diff --git a/migrations/versions/dbcf2175e87f_modèles_assiduites_justificatifs.py b/migrations/versions/dbcf2175e87f_modèles_assiduites_justificatifs.py
index b74fa27d7f..8b4b39d432 100755
--- a/migrations/versions/dbcf2175e87f_modèles_assiduites_justificatifs.py
+++ b/migrations/versions/dbcf2175e87f_modèles_assiduites_justificatifs.py
@@ -11,7 +11,7 @@ import sqlalchemy as sa
 
 # revision identifiers, used by Alembic.
 revision = "dbcf2175e87f"
-down_revision = "6520faf67508"
+down_revision = "b8df1b913c79"
 branch_labels = None
 depends_on = None
 
diff --git a/tests/unit/test_assiduites.py b/tests/unit/test_assiduites.py
index 567c49ad5d..3ba691a530 100644
--- a/tests/unit/test_assiduites.py
+++ b/tests/unit/test_assiduites.py
@@ -395,7 +395,7 @@ def verifier_filtrage_justificatifs(etud: Identite, justificatifs: list[Justific
 
     # Justifications des assiduites
 
-    assert len(scass.justifies(justificatifs[2])) == 1, "Justifications mauvais"
+    assert len(scass.justifies(justificatifs[2])) == 2, "Justifications mauvais"
     assert len(scass.justifies(justificatifs[0])) == 0, "Justifications mauvais"