[dependabot]

Bumps python-json-logger from 3.3.0 to 4.2.0.

Release notes

Sourced from python-json-logger's releases.

4.2.0

4.2.0 - 2026-08-15

Changed

• Logging a dict no longer modifies it. exc_info and stack_info were previously added to the caller's dict. #66
• Move development dependencies from project.optional-dependencies.dev to [dependency-groups].dev (PEP 735). #46

Fixed

• $ style formats now support unbraced $name fields, not just ${name}. #18

Thanks @​gaoflow, @​prateek-dagar, @​Sanjays2402

4.1.0

4.1.0 - 2026-03-29

Added

• Add support for Python 3.14, PyPy 3.11

Removed

• Remove support for Python 3.8, 3.9 (includes PyPy versions).

4.0.0

4.0.0 - 2025-10-06

Added

• Support DictConfigurator prefixes for rename_fields and static_fields. #45
  • Allows using values like ext://sys.stderr in fileConfig/dictConfig value fields.
• Support comma seperated lists for Formatter fmt (style=",") e.g. "asctime,message,levelname" #15
  • Note that this style is specific to python-json-logger and thus care should be taken not to pass this format to other logging Formatter implementations.
• Supports sequences of strings (e.g. lists and tuples) of field names for Formatter fmt. #16

Changed

• Rename pythonjsonlogger.core.LogRecord and log_record arguments to avoid confusion / overlapping with logging.LogRecord. #38
  • Affects arguments to pythonjsonlogger.core.BaseJsonFormatter (and any child classes).
    • serialize_log_record
    • add_fields
    • jsonify_log_record
    • process_log_record
  • Note: functions referring to log_record have not had their function name changed.

Removed

• Remove support for providing strings instead of objects when instantiating formatters. Instead use the DictConfigurator ext:// prefix format when using fileConfig/dictConfig. #47
  • Affects pythonjsonlogger.json.JsonFormatter: json_default, json_encoder, json_serializer.
  • Affects pythonjsonlogger.orjson.OrjsonFormatter: json_default.
  • Affects pythonjsonlogger.msgspec.MsgspecFormatter: json_default.

Thanks @​rubensa

v4.0.0.rc1

... (truncated)

Changelog

Sourced from python-json-logger's changelog.

4.2.0 - 2026-08-15

Changed

• Logging a dict no longer modifies it. exc_info and stack_info were previously added to the caller's dict. #66
• Move development dependencies from project.optional-dependencies.dev to [dependency-groups].dev (PEP 735). #46

Fixed

• $ style formats now support unbraced $name fields, not just ${name}. #18

Thanks @​gaoflow, @​prateek-dagar, @​Sanjays2402

4.1.0 - 2026-03-29

Added

• Add support for Python 3.14, PyPy 3.11

Removed

• Remove support for Python 3.8, 3.9 (includes PyPy versions).

4.0.0 - 2025-10-06

Added

• Support DictConfigurator prefixes for rename_fields and static_fields. #45
  • Allows using values like ext://sys.stderr in fileConfig/dictConfig value fields.
• Support comma separated lists for Formatter fmt (style=",") e.g. "asctime,message,levelname" #15
  • Note that this style is specific to python-json-logger and thus care should be taken not to pass this format to other logging Formatter implementations.
• Supports sequences of strings (e.g. lists and tuples) of field names for Formatter fmt. #16

Changed

• Rename pythonjsonlogger.core.LogRecord and log_record arguments to avoid confusion / overlapping with logging.LogRecord. #38
  • Affects arguments to pythonjsonlogger.core.BaseJsonFormatter (and any child classes).
    • serialize_log_record
    • add_fields
    • jsonify_log_record
    • process_log_record
  • Note: functions referring to log_record have not had their function name changed.

Removed

• Remove support for providing strings instead of objects when instantiating formatters. Instead use the DictConfigurator ext:// prefix format when using fileConfig/dictConfig. #47
  • Affects pythonjsonlogger.json.JsonFormatter: json_default, json_encoder, json_serializer.
  • Affects pythonjsonlogger.orjson.OrjsonFormatter: json_default.
  • Affects pythonjsonlogger.msgspec.MsgspecFormatter: json_default.

Thanks @​rubensa

Commits

• 806dba9 Release 4.2.0
• 010b730 [core] Fixup doc-strings, remove outdated comments
• b865bd3 [core] support unbraced $name fields in $ style formats (#69)
• 23a2c12 test: Add tests for exception notes, exception groups, and exception note gro...
• 355e44f docs: fix spelling typos in docs and core docstrings (#71)
• 0fcfc06 Move development dependencies to dependency-groups (PEP 735) (#70)
• 2557bbc fix: prevent mutation of original dict when record.msg is a dict (#66)
• 3cc30fc Fix tox build failure under PyPy 3.10 by conditionally pinning mypy<2 (#68)
• 01cb83c [docs.security] Fix type on last date
• d80c68d Release v4.1.0
• Additional commits viewable in compare view

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Summary by cubic

Bumps python-json-logger from 3.3.0 to 4.2.0 in the backend. This major update introduces breaking changes to formatter APIs.

Breaking changes

• Renamed log_record arguments in BaseJsonFormatter methods (serialize_log_record, add_fields, jsonify_log_record, process_log_record) to avoid conflict with logging.LogRecord.
• Removed support for passing strings as formatter options like json_default, json_encoder, json_serializer; use objects or ext:// prefixes instead.
• Logging a dict no longer mutates it, so callers relying on the old side effect need to adjust.

^{Written for commit 093a122. Summary will update on new commits.}

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