Building an API Gateway with Koa and AppSignal
SMRTR summary
Building an API gateway with Koa and AppSignal is simpler than it sounds. Koa's onion-style middleware keeps validation, upstream fetching, and response enrichment cleanly separated, while AppSignal's Node.js agent auto-instruments Koa for traces and errors with minimal setup. The walkthrough covers proxying JSONPlaceholder data, parallel upstream calls, input validation, and catching upstream failures before they silently become 500s.
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