json

gogstash json filter module

This filter parses a JSON string in the log event message back to a map structure. The JSON structure can either be appended to a new key or merged into the log event structure.

Synopsis

filter:
  - type: json
    # (optional) key of the parsed JSON map that contains the original log message
    message: msg
    # (optional) new key to append JSON map to
    appendkey: logmsg
    # (optional) key of the parsed JSON map that contains the log timestamp
    timestamp: time
    # (mandantory if timestamp is set) format string of the time
    timeformat: 2006-01-02T15:04:05.999999999Z

Example for JSON append

Input string (from dockerlog input):

"{\"name\":\"Proxy\",\"hostname\":\"gogstash\",\"pid\":18,\"level\":30,\"module\":\"MQTT\",\"msg\":\"New close event for close.user.f30c2659cf56\",\"time\":\"2017-09-14T15:39:42.626Z\",\"v\":0}"

Config:

filter:
  - type: json
    appendkey: logmsg
    timestamp: time
    timeformat: 2006-01-02T15:04:05.999999999Z

Produces the following output:

{
    "@timestamp": "2017-09-14T15:39:42.626834631Z",
    "containerid": "ab5aa92191773848e2a1b28368b333e6afb5cc722ee4d243c8a754485aad8836",
    "containername": "proxy",
    "host": "localhost",
    "logmsg": {
        "hostname": "gogstash",
        "level": "30",
        "module": "MQTT",
        "msg": "New close event for close.user.f30c2659cf56",
        "name": "Proxy",
        "pid": 18,
        "time": "2017-09-14T15:39:42.626Z",
        "v": 0
    }
}

Example for JSON merge

Input string (from dockerlog input):

"{\"name\":\"Proxy\",\"hostname\":\"gogstash\",\"pid\":18,\"level\":30,\"module\":\"MQTT\",\"msg\":\"New close event for close.user.f30c2659cf56\",\"time\":\"2017-09-14T15:39:42.626Z\",\"v\":0}"

Config:

filter:
  - type: json
    message: msg
    timestamp: time
    timeformat: 2006-01-02T15:04:05.999999999Z

Produces the following output:

{
    "@timestamp": "2017-09-14T15:39:42.626834631Z",
    "containerid": "ab5aa92191773848e2a1b28368b333e6afb5cc722ee4d243c8a754485aad8836",
    "containername": "proxy",
    "host": "localhost",
    "hostname": "gogstash",
    "level": "30",
    "module": "MQTT",
    "message": "New close event for close.user.f30c2659cf56",
    "name": "Proxy",
    "pid": 18,
    "time": "2017-09-14T15:39:42.626Z",
    "v": 0
}