diff --git a/src/ert/storage/local_ensemble.py b/src/ert/storage/local_ensemble.py
index 5c10872b57f..b0f9d71671d 100644
--- a/src/ert/storage/local_ensemble.py
+++ b/src/ert/storage/local_ensemble.py
@@ -147,7 +147,7 @@ def create(
         )
 
         storage._write_transaction(
-            path / "index.json", index.model_dump_json().encode("utf-8")
+            path / "index.json", index.model_dump_json(indent=2).encode("utf-8")
         )
 
         return cls(storage, path, Mode.WRITE)
@@ -341,7 +341,7 @@ def set_failure(
             type=failure_type, message=message if message else "", time=datetime.now()
         )
         self._storage._write_transaction(
-            filename, error.model_dump_json().encode("utf-8")
+            filename, error.model_dump_json(indent=2).encode("utf-8")
         )
 
     def unset_failure(
diff --git a/src/ert/storage/local_experiment.py b/src/ert/storage/local_experiment.py
index e735359abb3..ef4d88b78ed 100644
--- a/src/ert/storage/local_experiment.py
+++ b/src/ert/storage/local_experiment.py
@@ -119,7 +119,9 @@ def create(
         if name is None:
             name = datetime.today().strftime("%Y-%m-%d")
 
-        (path / "index.json").write_text(_Index(id=uuid, name=name).model_dump_json())
+        (path / "index.json").write_text(
+            _Index(id=uuid, name=name).model_dump_json(indent=2)
+        )
 
         parameter_data = {}
         for parameter in parameters or []:
diff --git a/src/ert/storage/migration/to5.py b/src/ert/storage/migration/to5.py
index 1b7c79108f4..42efddc5fdd 100644
--- a/src/ert/storage/migration/to5.py
+++ b/src/ert/storage/migration/to5.py
@@ -31,7 +31,7 @@ def migrate(path: Path) -> None:
             print(
                 _Index(
                     id=UUID(experiment.name), name="default_experiment_name"
-                ).model_dump_json(),
+                ).model_dump_json(indent=2),
                 file=f,
             )