# Apache Log4j

**Canonical:** https://apis.io/providers/log4j/  
**Website:** https://logging.apache.org/log4j/2.x/  
**APIs profiled:** 2

Apache Log4j is a versatile, industrial-grade Java logging framework composed of an API, its implementation, and components to assist deployment for various use cases. It is part of the Apache Logging Services project. Log4j is a Java library distributed as Maven artifacts and is consumed via its Java API rather than over the network; no public HTTP/REST surface is published.

## Kin Score — 17.0 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 17.0).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Education & Research**: 22.2 (matched via tags).

## Agent readiness — 3.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (2)

- **Log4j API** — The logging facade providing a feature-rich Java interface for application logging. Applications code against this stable API while delegating to a backing implementation such a...
- **Log4j Core** — The reference implementation of the Log4j API providing appenders, layouts, filters, lookups and configuration that route log events to consoles, files, databases, network endpo...

## Security (2)

- **Log4J Domain Security** — TLSv1.3 · HSTS · DMARC
- **Log4J Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Log4J Plans Pricing**

## Tags

Apache, Debugging, Java, Library, Logging, Monitoring, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/log4j/). Scores are computed from the provider's own public artifacts under a published rubric.