JavaScriptSolidServer/src/utils/error-handler.js at patchAppend · bourgeoa/JavaScriptSolidServer · GitHub

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/**

* Top-level Fastify error handler that logs the full stack for any 5xx.

* Without this, 500 responses carry only Fastify's default 91-byte body and

* leave no trace in logs — production debugging has to infer the exception

* from the response body alone (see #309 investigation for why that's bad).

* 4xx errors carry their own statusCode and don't need stack logging — they

* are expected client errors with self-explanatory messages.

export function registerErrorHandler(fastify) {

fastify.setErrorHandler(function (err, request, reply) {

const statusCode = err.statusCode ?? 500;

if (statusCode >= 500) {

request.log.error({

err,

method: request.method,

url: request.url,

hostname: request.hostname

}, 'Unhandled 5xx error');

}

reply.send(err);

});

}