import json

import re

def fix_json(json_string):

"""

Attempts to fix common JSON errors in a string.

Includes defensive checks to avoid crashing on invalid input.

"""

try:

# Attempt to load the JSON string

data = json.loads(json_string)

return data # Return if valid JSON

except json.JSONDecodeError as e:

print(f"Initial JSON decode error: {e}")

# Attempt to fix common errors: missing commas, trailing commas

fixed_string = json_string.replace('}{', '},{') #Fixes trailing commas

fixed_string = re.sub(r',}', ')', fixed_string) #Fixes missing commas

try:

data = json.loads(fixed_string)

return data # Return if fixed JSON

except json.JSONDecodeError as e2:

print(f"Fixing JSON decode error: {e2}")

return None # Return None if fixing fails

if __name__ == '__main__':

#Example Usage

#Valid JSON

valid_json = '{"name": "John", "age": 30}'

fixed_data = fix_json(valid_json)

if fixed_data:

print(f"Valid JSON fixed: {fixed_data}")

#JSON with trailing comma

trailing_comma_json = '{"name": "John", "age": 30,}'

fixed_data = fix_json(trailing_comma_json)

if fixed_data:

print(f"Trailing comma JSON fixed: {fixed_data}")

#JSON with missing comma

missing_comma_json = '{"name": "John" "age": 30}'

fixed_data = fix_json(missing_comma_json)

if fixed_data:

print(f"Missing comma JSON fixed: {fixed_data}")

#Invalid JSON

invalid_json = '{"name": "John", "age": 30'

fixed_data = fix_json(invalid_json)

if fixed_data is None:

print("Invalid JSON not fixed.")