Validate if a file a valid jsonl file

validate_jsonl.py

import fileinput
import json

def valid_json(json_str):
    try:
        json.loads(json_str)
        return True
    except:
        return False
    return True

for ln, line in enumerate(fileinput.input()):
    if not valid_json(line):
        print("Error in line %s" % str(ln+1))
        print("line: %s" % line)