I am facing an issue while decoding json string using json.loads

sajuptpm sajuptpm at gmail.com
Wed Dec 26 08:14:41 CET 2012


I am facing an issue while decoding json string using json.loads(jstring). Its working, if i do json.dumps(eval(jstring)) before json.loads(jstring). I could not figure out the issue. I want to avoide use of "eval" here.



########## Failing without json.dumps(eval(jstring)) ############


def format_json_string(self, jstring):
	"""
	"""
	from pprint import pprint
	print "===string before urllib.unquote===", pprint(jstring)
	jstring = urllib.unquote(jstring)##For revert encode change applied in the javascript
	print "===string after urllib.unquote===", pprint(jstring)
	jstring = json.loads(jstring)
	print "===string after json.loads(jstring) ===", pprint(jstring)




===string from client (javascript)========u'{"selected_objects":{"datacenter-2":{"name":"Data !@#$%25^&*()_ {}[]|%5c%2f.,?><:\\"`Center8(Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8)","type":"Datacenter","moid":"datacenter-2","actual_name":"Data !@#$%25^&*()_ {}[]|%5c%2f.,?><:\\"`Center8","server_pools":[{"name":"cluster ~!@#$%25^&*()_ {}|\\":?><,.%2f;\'%5c][=-`(cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`)","type":"ClusterComputeResource","moid":"domain-c401","actual_name":"cluster ~!@#$%25^&*()_ {}|\\":?><,.%2f;\'%5c][=-`","hosts":[{"name":"192.168.1.13","type":"HostSystem","moid":"host-27","actual_name":"192.168.1.13"}]}]}}}'
None



===string after urllib.unquote========u'{"selected_objects":{"datacenter-2":{"name":"Data !@#$%^&*()_ {}[]|\\/.,?><:\\"`Center8(Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8)","type":"Datacenter","moid":"datacenter-2","actual_name":"Data !@#$%^&*()_ {}[]|\\/.,?><:\\"`Center8","server_pools":[{"name":"cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\][=-`(cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`)","type":"ClusterComputeResource","moid":"domain-c401","actual_name":"cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\][=-`","hosts":[{"name":"192.168.1.13","type":"HostSystem","moid":"host-27","actual_name":"192.168.1.13"}]}]}}}'
None
Traceback (most recent call last):
  File "/home/saju/cvt/tk/src/cct/web/cct/cct/controllers/VcenterController.py", line 69, in import_managed_objects_from_vcenter
    self.vcenter_service.validate_vcenter(session['auth'], vcenter_id, context)
  File "/home/saju/cvt/tk/src/cct/web/cct/cct/viewModel/VcenterService.py", line 360, in validate_vcenter
    context = self.format_json_string(context)
  File "/home/saju/cvt/tk/src/cct/web/cct/cct/viewModel/VcenterService.py", line 747, in format_json_string
    jstring = json.loads(jstring)
  File "/home/saju/cms/cct-enterprise/tg2env/local/lib/python2.7/site-packages/simplejson-2.5.0-py2.7-linux-x86_64.egg/simplejson/__init__.py", line 451, in loads
    return _default_decoder.decode(s)
  File "/home/saju/cms/cct-enterprise/tg2env/local/lib/python2.7/site-packages/simplejson-2.5.0-py2.7-linux-x86_64.egg/simplejson/decoder.py", line 402, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/saju/cms/cct-enterprise/tg2env/local/lib/python2.7/site-packages/simplejson-2.5.0-py2.7-linux-x86_64.egg/simplejson/decoder.py", line 418, in raw_decode
    obj, end = self.scan_once(s, idx)
JSONDecodeError: Invalid \escape: line 1 column 289 (char 289)




########### Working with json.dumps(eval(jstring)) #########



But, here i have to do json.dumps(eval(jstring)) before json.loads(). How to do it without eval ??? 



def format_json_string(self, jstring):
	"""
	"""
	from pprint import pprint
	print "===string from client (javascript)===", pprint(jstring)
	jstring = urllib.unquote(jstring)##For revert encode change applied in the javascript
	print "===string after urllib.unquote===", pprint(jstring)
	jstring = json.dumps(eval(jstring))
	print "===string after json.dumps(eval(jstring) ===", pprint(jstring)
	jstring = json.loads(jstring)
	print "===string after json.loads(jstring) ===", pprint(jstring)




===string from client (javascript)========u'{"selected_objects":{"datacenter-2":{"name":"Data !@#$%25^&*()_ {}[]|%5c%2f.,?><:\\"`Center8(Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8)","type":"Datacenter","moid":"datacenter-2","actual_name":"Data !@#$%25^&*()_ {}[]|%5c%2f.,?><:\\"`Center8","server_pools":[{"name":"cluster ~!@#$%25^&*()_ {}|\\":?><,.%2f;\'%5c][=-`(cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`)","type":"ClusterComputeResource","moid":"domain-c401","actual_name":"cluster ~!@#$%25^&*()_ {}|\\":?><,.%2f;\'%5c][=-`","hosts":[{"name":"192.168.1.13","type":"HostSystem","moid":"host-27","actual_name":"192.168.1.13"}]}]}}}'
None



===string after urllib.unquote===u'{"selected_objects":{"datacenter-2":{"name":"Data !@#$%^&*()_ {}[]|\\/.,?><:\\"`Center8(Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8)","type":"Datacenter","moid":"datacenter-2","actual_name":"Data !@#$%^&*()_ {}[]|\\/.,?><:\\"`Center8","server_pools":[{"name":"cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\][=-`(cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`)","type":"ClusterComputeResource","moid":"domain-c401","actual_name":"cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\][=-`","hosts":[{"name":"192.168.1.13","type":"HostSystem","moid":"host-27","actual_name":"192.168.1.13"}]}]}}}'
None



===string after json.dumps(eval(jstring)========'{"selected_objects": {"datacenter-2": {"actual_name": "Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8", "moid": "datacenter-2", "type": "Datacenter", "name": "Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8(Data !@#$%^&*()_ {}[]|\\\\/.,?><:\\"`Center8)", "server_pools": [{"hosts": [{"actual_name": "192.168.1.13", "moid": "host-27", "type": "HostSystem", "name": "192.168.1.13"}], "actual_name": "cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`", "moid": "domain-c401", "type": "ClusterComputeResource", "name": "cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`(cluster ~!@#$%^&*()_ {}|\\":?><,./;\'\\\\][=-`)"}]}}}'
None



===string after json.loads(jstring)========{'selected_objects': {'datacenter-2': {'actual_name': 'Data !@#$%^&*()_ {}[]|\\/.,?><:"`Center8',
                                       'moid': 'datacenter-2',
                                       'name': 'Data !@#$%^&*()_ {}[]|\\/.,?><:"`Center8(Data !@#$%^&*()_ {}[]|\\/.,?><:"`Center8)',
                                       'server_pools': [{'actual_name': 'cluster ~!@#$%^&*()_ {}|":?><,./;\'\\][=-`',
                                                         'hosts': [{'actual_name': '192.168.1.13',
                                                                    'moid': 'host-27',
                                                                    'name': '192.168.1.13',
                                                                    'type': 'HostSystem'}],
                                                         'moid': 'domain-c401',
                                                         'name': 'cluster ~!@#$%^&*()_ {}|":?><,./;\'\\][=-`(cluster ~!@#$%^&*()_ {}|":?><,./;\'\\][=-`)',
                                                         'type': 'ClusterComputeResource'}],
                                       'type': 'Datacenter'}}}




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