ChatGPT plugins extend the AI's capabilities by integrating with external APIs via a manifest file and OpenAPI specification. The architecture follows a request-response model where ChatGPT sends user intents to your endpoint, and your service returns structured data or actions. This section breaks down the manifest schema, endpoint requirements, and how to handle streaming responses for real-time interactions.
Begin by installing Node.js 18+, Python 3.9+, or any language with HTTP server support. Use tools like ngrok for local tunneling to expose your development server to ChatGPT's verification endpoints. We'll walk through creating a basic plugin with Express.js, including CORS handling, rate limiting, and environment variable management for API keys.
OAuth 2.0 is the recommended authentication flow, with support for client credentials and authorization code grants. Implement JWT tokens with short expiration times (15 minutes) and refresh token rotation. The guide covers best practices for sanitizing user inputs, validating request signatures, and using HTTPS-only endpoints to prevent man-in-the-middle attacks.
Use ChatGPT's built-in plugin tester to simulate user queries and inspect API responses. Employ tools like Postman for endpoint validation and Winston for structured logging. We'll cover common pitfalls like timeout errors (5-second limit), response size caps (25KB), and how to use the debug mode in ChatGPT's UI to trace request/response cycles.
Deploy your plugin to AWS Lambda, Google Cloud Run, or Vercel with auto-scaling configurations. Ensure your manifest file includes proper icons, descriptions, and legal info for OpenAI's review process. The section details how to handle versioning, monitor usage with Datadog, and set up CI/CD pipelines with GitHub Actions for seamless updates.
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Any language that can serve HTTP endpoints works, but Node.js and Python are most common due to their extensive libraries and quick setup times. The guide focuses on Node.js with Express.js examples, but principles apply universally.
Initial reviews typically take 3-7 business days after submission, but can extend if your plugin requires complex authentication or handles sensitive data. Prepare all legal documentation and testing evidence in advance to speed up approval.
Yes, you can implement subscription models via OAuth payment gates or usage-based billing. OpenAI currently allows plugins to link to external payment systems, but they must comply with their monetization policies outlined in the developer terms.