diff --git a/odoo/addons/base/models/ir_http.py b/odoo/addons/base/models/ir_http.py
index e7613af207a..ab2f903183d 100644
--- a/odoo/addons/base/models/ir_http.py
+++ b/odoo/addons/base/models/ir_http.py
@@ -194,7 +194,12 @@ class IrHttp(models.AbstractModel):
                 return serve
 
         # Don't handle exception but use werkzeug debugger if server in --dev mode
-        if 'werkzeug' in tools.config['dev_mode'] and not isinstance(exception, werkzeug.exceptions.NotFound):
+        # Don't intercept JSON request to respect the JSON Spec and return exception as JSON
+        # "The Response is expressed as a single JSON Object, with the following members:
+        #   jsonrpc, result, error, id"
+        if ('werkzeug' in tools.config['dev_mode']
+                and not isinstance(exception, werkzeug.exceptions.NotFound)
+                and request._request_type != 'json'):
             raise exception
 
         try: