14log

14log is an open-source logging library designed to provide structured, cross-language log events with low-latency I/O. It aims to standardize log formats across platforms and support multiple backends for distributed systems.

Core features include structured logging with key-value fields, ISO 8601 timestamps, and configurable log levels. By default it emits JSON, with an optional human-readable mode. It supports rotation, compression, and multiple sinks such as files, stdout, syslog, and cloud logging services.

Bindings are available for C, C++, Python, Go, and JavaScript, with a common API that lets applications emit logs from multiple languages without re-implementing the formatter. The engine emphasizes non-blocking I/O, batching, and minimal allocations to reduce latency in high-throughput environments.

Configuration is via YAML or JSON, with environment-variable overrides and dynamic reconfiguration at runtime. Redaction features help secure sensitive fields, and integration points with tracing systems (including OpenTelemetry) enable correlation across services.

14log originated within the open-source community as a lightweight alternative to heavier logging stacks. The project is maintained by volunteers and released under the MIT license, with public repositories and regular releases.

See also: log4j, slf4j, OpenTelemetry.