How to Validate two JSON API Response key-value pair matches on runtime using python?

Question

I am trying to validate two API JSON response key-value pairs for same key values and throw an error if there is a mismatch in the JSON response.

Eg: 1. www.oldurl.com gives=>

   { "firstName":"alex", "age":31, "dob":"10-12-1988" }

2. www.newurl.com gives =>

   { "firstName":"**alx**", "**ag**":31, "dob":"10-12-1988" }

Here the oldurl and newurl gives the same JSON response but in newurl we see an error in key and values.

Now, I need to catch this error and show the user that there is a mismatch in newurl.com with key firstname and age.

Python code:

import unittest
import requests, json,settings
from requests.auth import HTTPBasicAuth
from jsonschema import validate
class TestOne(unittest.TestCase):
    def setUp(self):

    def test_oldurl(self):
    resp=requests.get('www.oldurl.com',auth=HTTPBasicAuth(settings.USER_NAME,settings.PASSWORD))
    data = resp.text
    print (data)  #Prints json 

    def test_newurl(self):
    resp=requests.get('www.newurl.com',auth=HTTPBasicAuth(settings.USER_NAME,settings.PASSWORD))
    data = resp.text
    print (data)  #Prints json

now I got two JSON response, How can I validate these two responses. Is there any python libraries that can validate and show any error in keys and values.

note: Both JSON response should be same I am doing this as part of validation to avoid any error in the future response.

I also used schema for one JSON responses key validation alone. used:

    def setUp(self):
    with open('Blueprint_schema.json', 'r') as f:
        self.schema = f.read()
        self.file = f
     validate(json.loads(data), json.loads(self.schema))
     self.assertNotEqual(data,'[]')

but this is helping only for one JSON response key alone. So, I need to compare two API's JSON response while executing or by storing it in two files and opening it and validating. I thought these files validation but it will be more coding so thought of reducing the length of code by validating on runtime itself.

Please suggest your ideas.

Tanmay jain · Accepted Answer · 2018-09-23 04:21:14Z

1

# newurl_resp should also give back same key:value pairs as oldurl was giving

#load JSON Data into Dictionary 
import json
f = open("response_oldurl.json")
oldurl_resp= json.load(f)
f.close()
#type(oldurl_resp) --> <class dict>

oldurl_resp = { "firstName":"alex", "age":31, "dob":"10-12-1988" }
newurl_resp = { "firstName":"**alx**", "**ag**":31, "dob":"10-12-1988"}

approach 1 report errors on the fly

def validate_resp(old_resp,new_resp):
    for old_k,old_v in oldurl_resp.items():

        try:
            if old_k in new_resp:
                new_val = new_resp[old_k]
            else:
                raise KeyError('newurl_response doesn\'t have key: '+old_k)

            try:
                if old_v != new_val:
                    raise ValueError('new value = '+str(new_val)+' doesn\'t match with orignal value = '+str(old_v)+' of key: '+str(old_k))

                    #raise ValueError('new value = {} doesn\'t match with orignal value = {} of key: {}'.format(new_val,old_v,old_k))

            except ValueError as v_err:
                print(v_err.args)

        except KeyError as k_err:
            print(k_err.args)


validate_resp(oldurl_resp,newurl_resp)

#("new value = **alx** doesn't match with orignal value = alex of key: firstName",)
#("newurl_response doesn't have key: age",)

approach 2 saves them for later use

items_with_value_err = []
missing_keys = []

def validate_resp(old_resp,new_resp):
    for old_k,old_v in oldurl_resp.items():
        if old_k in new_resp:
            if new_resp[old_k] != old_v:
                # key is same but new_resp contains different value
                items_with_value_err.append((old_k,old_v,new_resp[old_k]))
        else:
            missing_keys.append(old_k)

    if len(items_with_value_err) == 0 and len(missing_keys) == 0:
        return True
    else:
        return False

print(validate_resp(oldurl_resp, newurl_resp)) #prints False

edited Sep 23, 2018 at 4:21

answered Sep 22, 2018 at 3:35

Tanmay jain

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5 Comments

dow Over a year ago

Thank you @tanmay for the solution, It will be helpful if you explain the code as it contains two parts

Tanmay jain Over a year ago

@dow thanks for accepting the answer, glad I could help.

Tanmay jain Over a year ago

@dow stackoverflow.com/questions/2052390/…

Tanmay jain Over a year ago

@dow pastebin.com can you paste more complex json here there maybe more edge cases. and you can do print where I am appending the key, values to list approach 2 this will work for everything I guess if all you want to do is print key, values having error

Tanmay jain Over a year ago

@dow replace that line with this raise ValueError('new value = '+str(new_val)+' doesn\'t match with orignal value = '+str(old_v)+' of key: '+str(old_k))

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