diff --git a/base_import_pdf_by_template/models/base_import_pdf_template.py b/base_import_pdf_by_template/models/base_import_pdf_template.py
index 3c341b893f..99744d72e9 100644
--- a/base_import_pdf_by_template/models/base_import_pdf_template.py
+++ b/base_import_pdf_by_template/models/base_import_pdf_template.py
@@ -1,5 +1,6 @@
 # Copyright 2024 Tecnativa - Víctor Martínez
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+import json
 import re
 from datetime import datetime
 
@@ -339,6 +340,7 @@ def _get_fixed_field_name_ttype_mapped(self):
             "integer": "fixed_value_integer",
             "selection": "fixed_value_selection",
             "text": "fixed_value_text",
+            "json": "fixed_value_text",
             "many2one": "fixed_value",
         }
 
@@ -348,6 +350,8 @@ def _get_fixed_value(self):
         f_value = self[f_name]
         if self.field_ttype == "selection":
             f_value = f_value.value
+        elif self.field_ttype == "json":
+            f_value = json.loads(f_value)
         return f_value
 
     def _replace_text(self, text, letters, prefix):
diff --git a/base_import_pdf_by_template/views/base_import_pdf_template_line_views.xml b/base_import_pdf_by_template/views/base_import_pdf_template_line_views.xml
index 02d923386b..2f62e40379 100644
--- a/base_import_pdf_by_template/views/base_import_pdf_template_line_views.xml
+++ b/base_import_pdf_by_template/views/base_import_pdf_template_line_views.xml
@@ -101,7 +101,7 @@
                         <field
                             name="fixed_value_text"
                             string="Fixed value"
-                            invisible="value_type != 'fixed' or field_ttype != 'text'"
+                            invisible="value_type != 'fixed' or field_ttype not in ('text', 'json')"
                         />
                         <field
                             name="fixed_value"