LangChain Code Reviewer

AI-powered code review tool that works as a LangChain Tool, powered by Groq (free, no paid API needed).

Features

• Detects bugs
• Flags security issues
• Highlights performance problems
• Provides a quality score (1-10)
• Returns human-readable feedback with issues and suggestions
• Supports multiple languages (e.g., JavaScript, TypeScript, Python, etc.)
• Works as a LangChain Tool (CodeReviewTool)

Installation

npm install langchain-code-reviewer

Setup

1. Create a Groq API key.
2. Set the environment variable:

Windows (PowerShell)

$env:GROQ_API_KEY="your_groq_api_key"

macOS / Linux

export GROQ_API_KEY="your_groq_api_key"

Quick Start

import { CodeReviewTool } from "langchain-code-reviewer";

async function main() {
  const tool = new CodeReviewTool();

  const code = `function divide(a, b) {
  return a / b;
}

// BUG: b may be undefined
console.log(divide(10));`;

  const input = JSON.stringify({
    code,
    language: "javascript",
    focus: "all",
  });

  const review = await tool.call(input);
  console.log(review);
}

main();

Supported Languages

• JavaScript
• TypeScript
• Python
• And other languages supported by passing the appropriate language string

Built With

• TypeScript
• Groq AI
• LLaMA 3 (via Groq)
• LangChain

License

MIT