LangChain Experimentation

A Node.js project exploring LangChain's structured output capabilities with OpenAI. Features include generating structured jokes using GPT-4o with both simple and chained approaches.

Prerequisites

• Node.js v20.17.0
• npm (latest stable)
• OpenAI API key

Setup

1. Install dependencies:

npm install

2. Configure environment:

cp .env.example .env

Edit .env and add your OpenAI API key.

Running Examples

Simple Structured Output

node simple.js

Demonstrates basic structured output using a Zod schema to generate a joke with setup and punchline.

Advanced Chain Example

node chain.js

Shows a more complex example that generates a joke and then rates it using a chain of operations.

Project Structure

• simple.js - Simple structured output example
• chain.js - Advanced chaining example with joke generation and rating
• .env - Environment configuration (not in git)
• .env.example - Environment template

Dependencies

• @langchain/core
• @langchain/openai
• langchain
• zod
• dotenv

Notes

The project uses GPT-4o for optimal results. Ensure your OpenAI API key has GPT-4o access.