A user-friendly interface to find the latest slf4j-api version (currently 2.0.17 as of early 2025) and download the JAR directly. 2. Why You Might Need This JAR
The most reliable way to get the slf4j-api.jar is through official repositories: download jar org.slf4j.loggerfactory
To download the JAR file for org.slf4j.LoggerFactory , you actually need to download the module. LoggerFactory is the core utility class within this API that produces loggers for various frameworks. 1. Where to Download the JAR A user-friendly interface to find the latest slf4j-api
For specific versions, you can browse and download the standalone JAR from the Maven Central org/slf4j/slf4j-api directory. LoggerFactory is the core utility class within this
However, . SLF4J is a "facade," meaning it provides the interface but not the actual logging logic. To actually see logs, you must also include a "binding" or "provider" JAR, such as: org.slf4j » slf4j-api - Maven Repository
If you are seeing a java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory , it means your Java project is missing the SLF4J API on its classpath.
You can download a complete distribution (ZIP or tar.gz) containing all necessary JAR files from the SLF4J Download Page .