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Python logging module outputs logs as JSON.

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


pip install json-pyformatter


import logging
from json_pyformmatter import JsonFormatter

logger = logging.getLogger(__name__)
handler = logging.StreamHandler()
fields = ('levelname', 'filename', 'message')

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
levelname Text logging level for the message
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


{"levelname": "INFO", "filename": "", "message": "hello"}

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

  "levelname": "INFO",
  "filename": "",
  "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'

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