How to compare 2 JSONs in python only with keys

Question

I checked this thread on comparing JSON objects.

JSON a:

{
    "errors": [
        {"error": "invalid", "field": "email"},
        {"error": "required", "field": "name"}
    ],
    "success": false
}

` JSON b: with extra field

{
    "errors": [
        {"error": "invalid", "field": "email"},
        {"error": "required", "field": "name"},
        { "key1": : "value2", }

    ],
    "success": false
}

I want to compare these 2 jsons in python such that it will tell me

IF JSON is same and found extra key-value pair then it should give result that Found new field: { "key1: : "value2", } and rest of the json is same.
1. If JSON is exactly same means if keys are matching in order then it will say TRUE.
2. If JSON Keys are same but values are different then it will say, for the below keys the values are different.

You need to write your own logic for this. There is no inbuilt function for this. — Moinuddin Quadri, Apr 14 '16 at 23:29
`import json` and load your json strings to python dictionaries. Then try some of the suggestions in [these search results](https://stackoverflow.com/search?q=python+compare+dictionaries) — jDo, Apr 15 '16 at 00:00
Which of the several JSON diffing modules doesn't do what you want? — Ignacio Vazquez-Abrams, Apr 15 '16 at 05:14
If the order of the keys is important, than you'll need to use `collections.OrderedDict` — magni-, Apr 15 '16 at 05:31
tried but still not able to find out. ll see how far I can go and ll post here. — born2Learn, Apr 18 '16 at 15:03

Prakhar · Answer 1 · 2016-05-14T12:05:48.800

you can do something like this,

import json

a = json.loads(json_1) #your json
b = json.loads(json_2) #json you want to compare

#iterating through all keys in b

for key in b.keys():
    value = b[key] 
    if key not in a:
       print "found new key {0} with value {1}".format(key, value)
    else:
       #check if values are not same
       if a[key] != value: print "for key %s values are different" % key

score 1 · Accepted Answer · answered Mar 05 '19 at 11:19

If you want to print only the difference in subjson (and not the whole structure from the root), you may want to use recursive request

def json_compare(json1, json2):
    #Compare all keys
    for key in json1.keys():
        #if key exist in json2:
        if key in json2.keys():
            #If subjson
            if type(json1[key]) == dict:
                json_compare(json1[key], json2[key])
            else: 
                if json1[key] != json2[key]:
                    print "These entries are different:"
                    print json1[key]
                    print json2[key]
        else:
            print "found new key in json1 %r" % key
    return True

How to compare 2 JSONs in python only with keys

2 Answers2