env_logger

[0.11.9] - 2026-02-11

[0.11.8] - 2025-04-01

Compatibility

• (kv) Deprecate the unstable-kv feature which may be removed in a future patch release

Features

• (kv) Stabilize key-value support behind the kv feature
• Expose ConfigurableFormat to build custom [Builder::format]s that leverage this

[0.11.7] - 2025-03-10

Internal

• Replaced humantime with jiff

[0.11.6] - 2024-12-20

Features

• Opt-in file and line rendering

Features

• Experimental support for key-value logging behind unstable-kv

Fixes

• Allow styling with Target::Pipe

Migration Guide

env_logger::fmt::Style: The bespoke styling API, behind color, was removed, in favor of accepting any ANSI styled string and adapting it to the target stream's capabilities.

Possible styling libraries include:

• anstyle is a minimal, runtime string styling API and is re-exported as env_logger::fmt::style
• owo-colors is a feature rich runtime string styling API
• color-print for feature-rich compile-time styling API

custom_format.rs uses anstyle via Formatter::default_level_style

Breaking Change

• Removed bespoke styling API
  • env_logger::fmt::Formatter::style
  • env_logger::fmt::Formatter::default_styled_level
  • env_logger::fmt::Style
  • env_logger::fmt::Color
  • env_logger::fmt::StyledValue
• Removed env_logger::filter in favor of env_filter

Compatibility

MSRV changed to 1.71

Features

• Automatically adapt ANSI escape codes in logged messages to the current terminal's capabilities
• Add support for NO_COLOR and CLICOLOR_FORCE, see https://bixense.com/clicolors/

Fixes

• Print colors when is_test(true)

Performance

• Avoid extra UTF-8 validation performed in some cases

Fixes

• Ensure custom pipes/stdout get flushed
• Don't panic on broken pipes when color is disabled

Performance

• Avoid hashing directives and accessing RNG on startup

Documentation

• Tweak RUST_LOG documentation

MSRV changed to 1.60 to hide optional dependencies

Fixes

• Resolved soundness issue by switching from atty to is-terminal

Breaking Changes

To open room for changing dependencies:

• Renamed termcolor feature to color
• Renamed atty feature to auto-color

• Fix a regression from v0.9.2 where env_logger would fail to compile with the termcolor feature turned off.

• Fix and un-deprecate Target::Pipe, which was basically not working at all before and deprecated in 0.9.1.

Breaking Changes

• Default message format now prints the target instead of the module

Improvements

• Added a method to print the module instead of the target

<!-- next-url --> [Unreleased]: https://github.com/rust-cli/env_logger/compare/v0.11.11...HEAD [0.11.11]: https://github.com/rust-cli/env_logger/compare/v0.11.10...v0.11.11 [0.11.10]: https://github.com/rust-cli/env_logger/compare/v0.11.9...v0.11.10 [0.11.9]: https://github.com/rust-cli/env_logger/compare/v0.11.8...v0.11.9 [0.11.8]: https://github.com/rust-cli/env_logger/compare/v0.11.7...v0.11.8 [0.11.7]: https://github.com/rust-cli/env_logger/compare/v0.11.6...v0.11.7 [0.11.6]: https://github.com/rust-cli/env_logger/compare/v0.11.5...v0.11.6 [0.11.5]: https://github.com/rust-cli/env_logger/compare/v0.11.4...v0.11.5 [0.11.4]: https://github.com/rust-cli/env_logger/compare/v0.11.3...v0.11.4 [0.11.3]: https://github.com/rust-cli/env_logger/compare/v0.11.2...v0.11.3 [0.11.2]: https://github.com/rust-cli/env_logger/compare/v0.11.1...v0.11.2 [0.11.1]: https://github.com/rust-cli/env_logger/compare/v0.11.0...v0.11.1 [0.11.0]: https://github.com/rust-cli/env_logger/compare/v0.10.2...v0.11.0 [0.10.2]: https://github.com/rust-cli/env_logger/compare/v0.10.1...v0.10.2 [0.10.1]: https://github.com/rust-cli/env_logger/compare/v0.10.0...v0.10.1 [0.10.0]: https://github.com/rust-cli/env_logger/compare/v0.9.3...v0.10.0 [0.9.3]: https://github.com/rust-cli/env_logger/compare/v0.9.2...v0.9.3 [0.9.2]: https://github.com/rust-cli/env_logger/compare/v0.9.0...v0.9.2 [0.9.0]: https://github.com/rust-cli/env_logger/compare/v0.8.4...v0.9.0