JSON logging for Python 
This library provides Python logging formatters to output JSON, 2 formatters are specific for Logstash message format version 0 or 1.
Installation
Using pip:
pip install json-logging-py
From source:
python setup.py install
Usage
The name of the library is jsonlogging, it provides 3 formatters:
JSONFormatter
{
"tags": [
"env=prod",
"role=www"
],
"timestamp": "2015-09-22T22:40:56.178715Z",
"level": "ERROR",
"host": "server-01.example.com",
"path": "example.py",
"message": "hello world!",
"logger": "root"
}
LogstashFormatterV0
{
"@source": "JSON://server-01.example.com/example.py",
"@source_host": "server-01.example.com",
"@message": "hello world!",
"@tags": [
"env=prod",
"role=www"
],
"@fields": {
"logger": "root",
"levelname": "ERROR"
},
"@timestamp": "2015-09-22T22:42:02.094525Z",
"@source_path": "example.py",
"@type": "JSON"
}
LogstashFormatterV1
{
"host": "server-01.example.com",
"logger": "root",
"type": "JSON",
"tags": [
"env=prod",
"role=www"
],
"path": "example.py",
"@timestamp": "2015-09-22T22:43:11.966558Z",
"@version": 1,
"message": "hello world!",
"levelname": "ERROR"
}
Python example
import logging
import jsonlogging
logger = logging.getLogger()
logHandler = logging.StreamHandler()
# You can also use LogstashFormatterV0 or LogstashFormatterV1
formatter = jsonlogging.JSONFormatter(
hostname="server-01.example.com"
tags=["env=prod", "role=www"],
indent=4)
logHandler.setFormatter(formatter)
logger.addHandler(logHandler)
# You can pass additional tags
logger.error('hello world!', extra={"tags": ["hello=world"]})
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