A simple python script to format json logs getting pipped in from stdin

json_tail.py

#!/usr/bin/env python

import sys
import json


def print_json(l):
    try:
        j = json.loads(l)
        print json.dumps(j, indent=4, sort_keys=True)
        print
        print "-" * 50
    except:
        pass

try:
    buff = ''
    while True:
        buff += sys.stdin.read(1)
        if buff.endswith('\n'):
            print_json(buff[:-1])
            buff = ''
except KeyboardInterrupt:
   sys.stdout.flush()
   pass

usage

chmod +x /path/to/json_print.py
tail -f file.log |  /path/to/json_print.py


Example


{
    "level": "info",
    "message": "publishing check request",
    "payload": {
        "command": "/usr/lib64/sensu/plugins/check_rabbitmq_cluster.py",
        "issued": 1438012694,
        "name": "check_rabbitmq_cluster"
    },
    "subscribers": [
        "rabbit"
    ],
    "timestamp": "2015-07-27T15:58:14.118235+0000"
}

--------------------------------------------------
{
    "level": "info",
    "message": "publishing check request",
    "payload": {
        "command": "/usr/lib64/sensu/plugins/check_devcenter.py",
        "issued": 1438012694,
        "name": "check_devcenter"
    },
    "subscribers": [
        "monitor"
    ],
    "timestamp": "2015-07-27T15:58:14.449236+0000"
}

--------------------------------------------------