Introduction to Boundary

Boundary is a production-grade TypeScript SDK that provides a unified interface for interacting with third-party APIs. It normalizes responses, standardizes error handling, and implements resilience patterns across all providers.

Problem Statement

Applications integrating multiple APIs face:

• Inconsistent response formats
• Different error structures
• Varying rate limit behaviors
• Diverse pagination strategies

Solution

Boundary provides a single abstraction layer that normalizes these differences while maintaining type safety and implementing proven resilience patterns.

Key Features

• Unified Request Pipeline: Auth → Rate Limit → Circuit Breaker → Retry → Fetch
• Predictable Responses: Always NormalizedResponse<T>
• Resilience First: Per-provider circuit breakers and adaptive retries
• Pluggable Observability: Monitor health and performance events
• Zero Runtime Dependencies: Lightweight and production-ready