Daily Archives: August 31, 2018

在 https://github.com/expressjs/express/blob/master/lib/router/index.js#L46 function router(req, res, next) { router.handle(req, res, next); } express router不會catch error，所以error handler定義在router內無法作用 要直接定義在app那層，參考doc Error-handling middleware app.use(function(err, req, res, next) { console.error(err.stack); res.status(500).send(‘Something broke!’); }); 另外是順序也很重要，next(err)會依照順序往下找，因此error handler應該定義在最後面 參考來源: https://stackoverflow.com/questions/45431595/express-error-handler-inside-router-doesnt-work