👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-07

fastapi langchain openai python

I'm having trouble with I've looked through the documentation and I'm still confused about I've been banging my head against this for hours. I'm currently trying to integrate the LangChain library with FastAPI to create a simple application that utilizes OpenAI's GPT model for generating responses. However, I keep working with an behavior that states `OpenAI API Key Not Found` whenever I make a request to my endpoint. I've ensured that my environment variable for the API key is set correctly, but it still doesn't seem to work. Here's what I've done so far: 1. I've set the environment variable in my terminal using `export OPENAI_API_KEY='your_api_key_here'`, and I've confirmed that it's correctly set by running `echo $OPENAI_API_KEY`. 2. In my FastAPI application, I'm using the following code snippet to initialize the OpenAI wrapper with LangChain: ```python from fastapi import FastAPI from langchain.llms import OpenAI app = FastAPI() # Attempting to initialize the OpenAI model llm = OpenAI(model_name="gpt-3.5-turbo") @app.post("/generate") async def generate_response(prompt: str): response = llm(prompt) return response ``` 3. I have also included `python-dotenv` to load environment variables from a `.env` file, with the following code: ```python from dotenv import load_dotenv import os load_dotenv() # Load environment variables from .env file ``` Despite these steps, when I make a POST request to `/generate` using Postman, I receive the following behavior: ``` behavior: OpenAI API Key Not Found ``` I've also tried restarting the FastAPI server and double-checking the API key for any typos, but nothing seems to resolve this scenario. Have I missed any crucial steps in the setup or configuration that could lead to this behavior? Any guidance would be greatly appreciated! For context: I'm using Python on Windows. Am I missing something obvious? Thanks, I really appreciate it!