langchain4j
langchain4j is an open-source Java project with 12.3k GitHub stars. It is associated with anthropic, chatgpt, chroma, embeddings. The repository is actively maintained, with recent commits.
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[](https://opensources.dev/resource/langchain4j)Apache-2.0Permissive — free to use in commercial and proprietary software, with attribution.View license →
Production readiness
4/5- Actively maintainedCommits in the last 6 months
- No known vulnerabilitiesNot yet scanned
- Clear, usable licenseApache-2.0 (permissive)
- Proven adoptionWidely used
- Has documentationDocumentation indexed
LangChain4j Documentation
Table of Contents
This is built using Docusaurus, a modern static docs/website generator.
Prerequisites
Node.JS (20+)
If Node.js is managed by Node Version Manager (nvm), run:
nvm use
Installation
This command installs all the Node dependencies.
npm ci
Build
This command builds the deployable static artifacts (i.e., html, js, css, etc) under the build directory. This static content can then be deployed to GitHub pages or Vercel, etc.
npm run build
Local Development
This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
npm run start