LangChain Install & Auth

Overview

Set up LangChain SDK packages and configure provider authentication. Covers the modular @langchain/* package ecosystem for Node.js/TypeScript and langchain-* packages for Python.

Prerequisites

• Node.js 18+ or Python 3.9+
• Package manager (npm/pnpm or pip/poetry)
• API key from at least one LLM provider (OpenAI, Anthropic, Google)

Instructions

Step 1: Install Core Packages (TypeScript)

set -euo pipefail
# Core + one provider (pick what you need)
npm install @langchain/core @langchain/openai