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langchain4j
Java

langchain4j

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It i

by langchain4j · GitHub
13k
Stars
2.5k
Forks
+103 this week
Trending
Apache-2.0
License
2023
Created
2 days ago
Last commit
anthropic
Category
Java
Language
Likely
Self-hostable
anthropicchatgptchromaApache-2.0JavaSelf-hostable
View on GitHub
In plain words

Build applications that use advanced AI tools with a simple and consistent interface in Java.

From the README

Documentation ↗

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📈 Star history
13.0k12.5k
2026-07-042026-08-31
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📄 About

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It i

langchain4j has 13k stars on GitHub. It has been forked 2.5k times. langchain4j is written mainly in Java. It has been in active development since 2023. langchain4j is available under the Apache-2.0 license. Its main topics are anthropic, chatgpt, chroma, embeddings.

❓ Frequently asked questions

What is langchain4j?

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It i

Is langchain4j open source?

langchain4j is an open-source project. It is released under the Apache-2.0 license.

Is langchain4j free?

Yes. langchain4j is free and open source — you can use, modify and self-host it.

What license does langchain4j use?

langchain4j is available under the Apache-2.0 license.

What language is langchain4j written in?

langchain4j is written mainly in Java.

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