json_diffs.py

# -*- coding: utf-8 -*-
#==============================================================================
#title           :json_diffs.py
#description     :This script compares each object of two JSON files
#author          :Patrick Alves (cpatrickalves@gmail.com)
#creation date   :10-07-2019
#python_version  :3.7
#==============================================================================

import json
import sys

# The main function
def compare_object(j1, j2, pathTillNow=""):
    ''' Compares two JSON objects

    Parameters
    ----------
    j1, j2 : JSON objects


    Returns
    -------
    bool
        Indicates whether j1 and j2 are equal
    '''

    if type(j1) != type(j2):
        print(f"The object type of {j1} and {j2} is different")
        return False

    elif type(j1) is dict:
        return compare_dict(j1, j2, pathTillNow)

    elif type(j1) is list:
        return compare_list(j1, j2, pathTillNow)

    else:
        return j1 == j2


def compare_dict(d1, d2, pathTillNow=""):
    ''' Compares each key and value in input dictionaries

    Parameters
    ----------
    d1, d2 : Input dictionaries


    Returns
    -------
    are_equal : bool
        Indicates whether d1 and d2 are equal
    '''

    # Default value
    are_equal = True

    # Compare the lengths
    if len(d1) != len(d2):
        print(f"Failed at '{pathTillNow}': The lengths of '{d1}' and '{d2}' are different")
        return False

    else:
        # Compare the keys and values
        for k, v in d1.items():
            if not k in d2:
                print(f"Failed at '{pathTillNow}': The key {k} was not found in '{d2}'")
                return False
            else:
                # Compare the objects
                if not compare_object(v, d2[k], pathTillNow+'/'+k):
                    # Print only values
                    if type(v) is not dict:
                        if type(v) is list and type(v[0]) is dict:
                            pass
                        else:
                            print(f"Failed at '{pathTillNow}': The values in object '{k}' are different: '{v}' != '{d2[k]}'")

                    are_equal = False

    return are_equal


def compare_list(l1, l2, pathTillNow=""):
    ''' Compares two lists

    Parameters
    ----------
    l1, l2 : Input lists


    Returns
    -------
    are_equal : bool
        Indicates whether l1 and l2 are equal
    '''

    # Default value
    are_equal = True

    # Compare the lengths
    if len(l1) != len(l2):
        print(f"Failed at '{pathTillNow}': The lengths of '{l1}' and '{l2}' are different")
        return False

    else:
        # Compare each element/object of the list
        for i in range(len(l1)):
            if not compare_object(l1[i], l2[i], pathTillNow):
                are_equal = False

    return are_equal


def main():

    # Json files
    json_f1 = None
    json_f2 = None

    # Each if there are input files in arguments
    if len(sys.argv) < 3:
        print(f"Error: Two input files required")
        print(f"<usage>: python json_diffs.py file01.json file02.json")
        sys.exit()

    # Try to load the files
    try:
        with open(sys.argv[1]) as json_file:
            json_f1 = json.load(json_file)
        with open(sys.argv[2]) as json_file:
            json_f2 = json.load(json_file)

    except Exception as exc:
        print(str(exc))
        sys.exit()

    result = compare_object(json_f1, json_f2)

    if result:
        print("The data in JSON files are equal")
    else:
        print("The data in JSON files are different")


# Running the script
if __name__ == "__main__":
    main()