errorcore
Middleware

Middleware

Framework integration is mostly about order. errorcore should initialize before clients are created, attach request context early, and sit close enough to the error path that the reported incident still reflects the real request.

Choose the page for the framework you actually run. The guidance stays intentionally small: where to mount, what to capture, and what a healthy request path should produce.

Express

Attach request context and error capture to the Express stack.

Fastify

Use hooks and the shared request lifecycle correctly.

Koa

Capture errors in the async middleware chain.

Hapi

Bind context through extensions and request decoration.

Raw HTTP

Minimal integration for a hand-rolled Node server.

Local Variables

Preserve the frame-level values that explain why the throw path was taken.

Express

Mount request context early and let the terminal error middleware report failures once per request.

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Middleware