Added the JSONIFY_PRETTYPRINT_REGULAR config variable. This fixes #725

CHANGES

@@ -62,6 +62,7 @@ Release date to be decided.
 - Changed how the teardown system is informed about exceptions.  This is now
   more reliable in case something handles an exception halfway through
   the error handling process.
+- Added the ``JSONIFY_PRETTYPRINT_REGULAR`` configuration variable.
 
 Version 0.9
 -----------

docs/config.rst

@@ -149,6 +149,11 @@ The following configuration values are used internally by Flask:
                                   unicode strings.  ``jsonfiy`` will
                                   automatically encode it in ``utf-8``
                                   then for transport for instance.
+``JSONIFY_PRETTYPRINT_REGULAR``   If this is set to ``True`` (the default)
+                                  jsonify responses will be pretty printed
+                                  if they are not requested by an
+                                  XMLHttpRequest object (controlled by
+                                  the ``X-Requested-With`` header)
 ================================= =========================================
 
 .. admonition:: More on ``SERVER_NAME``
@@ -192,7 +197,7 @@ The following configuration values are used internally by Flask:
    ``PREFERRED_URL_SCHEME``
 
 .. versionadded:: 0.10
-   ``JSON_AS_ASCII``
+   ``JSON_AS_ASCII``, ``JSONIFY_PRETTYPRINT_REGULAR``
 
 Configuring from Files
 ----------------------

flask/app.py

@@ -290,7 +290,8 @@ class Flask(_PackageBoundObject):
         'TRAP_BAD_REQUEST_ERRORS':              False,
         'TRAP_HTTP_EXCEPTIONS':                 False,
         'PREFERRED_URL_SCHEME':                 'http',
-        'JSON_AS_ASCII':                        True
+        'JSON_AS_ASCII':                        True,
+        'JSONIFY_PRETTYPRINT_REGULAR':          True,
     })
 
     #: The rule object to use for URL rules created.  This is used by

flask/json.py

@@ -194,8 +194,16 @@ def jsonify(*args, **kwargs):
     For security reasons only objects are supported toplevel.  For more
     information about this, have a look at :ref:`json-security`.
 
+    This function's response will be pretty printed if it was not requested
+    with ``X-Requested-With: XMLHttpRequest`` to simplify debugging unless
+    the ``JSONIFY_PRETTYPRINT_REGULAR`` config parameter is set to false.
+
     .. versionadded:: 0.2
     """
+    indent = None
+    if current_app.config['JSONIFY_PRETTYPRINT_REGULAR'] \
+        and not request.is_xhr:
+        indent = 2
     return current_app.response_class(dumps(dict(*args, **kwargs),
-        indent=None if request.is_xhr else 2),
+        indent=indent),
         mimetype='application/json')