Apache Log4j

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.

Apache Log4j publishes 2 APIs on the APIs.io network. Tagged areas include Apache, Debugging, Java, Library, and Logging.

Apache Log4j’s developer surface includes documentation, getting-started guide, release notes, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

25.3/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemium

2 APIs

ApacheDebuggingJavaLibraryLoggingMonitoringOpen Source

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 25.3/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 7.5 / 13

Governance 0.0 / 12

Discoverability 5.9 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/log4j: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Log4J Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

SourceCode

SourceCode

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Security

Security

Operate 1

Status, limits, changes, and where to get help

ReleaseNotes

ReleaseNotes

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Performance

Performance

Source (apis.yml)

aid: log4j
name: Apache Log4j
description: 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.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/log4j.png
tags:
- Apache
- Debugging
- Java
- Library
- Logging
- Monitoring
- Open Source
url: https://raw.githubusercontent.com/api-evangelist/log4j/refs/heads/main/apis.yml
created: '2024-01-15'
modified: '2026-04-28'
specificationVersion: '0.19'
apis:
- aid: log4j:log4j-api
  name: Log4j API
  description: 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 as Log4j Core.
  humanURL: https://logging.apache.org/log4j/2.x/manual/api.html
  tags:
  - API
  - Facade
  - Java
  - Logging
  properties:
  - type: Documentation
    url: https://logging.apache.org/log4j/2.x/manual/api.html
  - type: Reference
    url: https://logging.apache.org/log4j/2.x/javadoc.html
  - type: SourceCode
    url: https://github.com/apache/logging-log4j2
- aid: log4j:log4j-core
  name: Log4j Core
  description: The reference implementation of the Log4j API providing appenders, layouts, filters, lookups and configuration
    that route log events to consoles, files, databases, network endpoints and more.
  humanURL: https://logging.apache.org/log4j/2.x/manual/configuration.html
  tags:
  - Core
  - Implementation
  - Java
  - Logging
  properties:
  - type: Documentation
    url: https://logging.apache.org/log4j/2.x/manual/configuration.html
  - type: Reference
    url: https://logging.apache.org/log4j/2.x/javadoc.html
  - type: SourceCode
    url: https://github.com/apache/logging-log4j2
common:
- type: VulnerabilityDisclosure
  url: security/log4j-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/log4j-domain-security.yml
- type: Website
  url: https://logging.apache.org/log4j/2.x/
- type: Documentation
  url: https://logging.apache.org/log4j/2.x/manual/
- type: GettingStarted
  url: https://logging.apache.org/log4j/2.x/manual/getting-started.html
- type: Security
  url: https://logging.apache.org/security.html
- type: ReleaseNotes
  url: https://logging.apache.org/log4j/2.x/release-notes.html
- type: Performance
  url: https://logging.apache.org/log4j/2.x/performance.html
- type: SourceCode
  url: https://github.com/apache/logging-log4j2
- type: License
  url: https://www.apache.org/licenses/LICENSE-2.0
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Apache Log4j

Kin Score

APIs 2

Log4j API

Log4j Core

Pricing Plans 1

Log4J Plans Pricing