json-pyformatter

Python logging outputs as JSON.
This JsonFormatter is written in Pure Python.

Installation

pip install json-pyformatter

Usage

import logging
from json_pyformmatter import JsonFormatter

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
fields = ('levelname', 'filename', 'message')
handler.setFormatter(JsonFormatter(fields=fields))
logger.addHandler(hander)

logger.info('hello')

default fields is ('asctime', 'levelname', 'message')
Other supported fields are:

field name	description
name	Name of the logger (logging channel)
levelno	Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL)
levelname	Text logging level for the message ("DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL")
pathname	Full pathname of the source file where the logging call was issued
filename	Filename portion of pathname
module	Module (name portion of filename)
lineno	Source line number where the logging call was issued
funcName	Function name
created	Time when the LogRecord was created (time.time()return value)
asctime	Textual time when the LogRecord was created
msecs	Millisecond portion of the creation time
relativeCreated	Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded (typically at application startup time)
thread	Thread ID
threadName	Thread name
process	Process ID
message	The result of record.getMessage(), computed just as the record is emitted

In details, please refere to logrecord-attributes

Output

{"levelname": "INFO", "filename": "test_formatter.py", "message": "hello"}

If specify indent option as 2, the result is as follows:

{
  "levelname": "INFO",
  "filename": "test_formatter.py",
  "message": "hello"
}

When exc_info is True, the result includes traceback infomation as follows:

{
  'asctime': '2019-12-01 13:58:34',
  'levelname': 'ERROR',
  'message': 'error occurred !!',
  'traceback': [
    'Traceback (most rec...ll last):',
    'File "/example/test..._exc_info',
    'raise TypeError(message)',
    'TypeError: error occurred !!'
  ]
}

Logging message type is dict:

{
  'asctime': '2019-12-01 23:34:32',
  'levelname': 'INFO',
  'message': {
    'id': '001',
    'msg': 'This is test.',
    'name': 'test'
  }
}