API Integration

Modern web applications rarely exist in isolation. They need to send emails, process payments, store files, send notifications, and connect to dozens of third-party services. Each integration traditionally requires reading API documentation, handling authentication, managing rate limits, implementing error handling, and writing serialization code. Fabricate reduces this process to a single natural language description.

The AI understands the patterns behind API integration and generates complete client code for any REST API. When you describe what you need, Fabricate creates typed API clients with proper authentication headers, request serialization, response deserialization, error handling, and retry logic. The generated code is structured to be maintainable and follows the adapter pattern for easy swapping of providers.

Security is paramount when working with external APIs. Fabricate stores API credentials as environment secrets on Cloudflare Workers, ensuring they are never bundled into client-side code or exposed through version control. The AI generates server-side proxy endpoints that make API calls on behalf of the client, keeping credentials completely isolated from the browser.

Webhook handling is a common requirement for event-driven integrations. When external services need to notify your application about events like successful payments, new form submissions, or status changes, Fabricate generates webhook endpoints with proper signature verification, idempotent event processing, and error recovery. The generated handlers follow best practices for each specific service's webhook format.

For complex integrations that combine multiple services, Fabricate generates orchestration logic that coordinates between APIs. For example, building a notification system that sends emails via SendGrid and push notifications via a separate service involves coordinating multiple API calls with proper error handling for partial failures. The AI generates this orchestration code with appropriate fallback logic.

Fabricate generates API integrations using a layered architecture with typed clients, server-side proxies, and secure credential management. The API client layer provides typed methods for each endpoint, with request and response interfaces generated from API documentation or inferred from usage patterns.

Credentials are managed through Cloudflare Workers environment secrets, bound to your Worker at deploy time. The AI generates server-side API routes that act as proxies between your frontend and external APIs, preventing credential exposure. Each proxy endpoint includes request validation, response transformation, and error mapping to your application's error types.

Rate limiting is implemented at the proxy layer to prevent exceeding API provider limits. The generated code tracks request counts per time window and queues or rejects requests that would exceed limits. For APIs with complex rate limiting schemes like sliding windows or tiered limits, the AI generates appropriate throttling logic.

Webhook endpoints use provider-specific signature verification to prevent spoofed requests. For Stripe, this means validating the Stripe-Signature header with your webhook secret. For GitHub, it verifies the X-Hub-Signature-256 header. Each webhook handler processes events idempotently using event ID tracking to prevent duplicate processing.