1.Check if the key is loaded:

console.log(process.env.OPENAI_API_KEY);

If it's undefined, dotenv didn't load it correctly.

2.Check if your network block access to external APIs by using curl.

curl https://api.openai.com/v1/models -H "Authorization: Bearer your-api-key"

If this fails, it's a network issue, not your code.

Please provide the complete error message and your config to analyze the problem.