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express
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examples/error/index.js
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Rakesh Bisht
lint: remove unused parameters in examples
22 фев 2023, 18:25
22 фев 2023, 18:25
3c1d605
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'use strict' /** * Module dependencies. */ var express = require('../../'); var logger = require('morgan'); var app = module.exports = express(); var test = app.get('env') === 'test' if (!test) app.use(logger('dev')); // error handling middleware have an arity of 4 // instead of the typical (req, res, next), // otherwise they behave exactly like regular // middleware, you may have several of them, // in different orders etc. function error(err, req, res, next) { // log it if (!test) console.error(err.stack); // respond with 500 "Internal Server Error". res.status(500); res.send('Internal Server Error'); } app.get('/', function () { // Caught and passed down to the errorHandler middleware throw new Error('something broke!'); }); app.get('/next', function(req, res, next){ // We can also pass exceptions to next() // The reason for process.nextTick() is to show that // next() can be called inside an async operation, // in real life it can be a DB read or HTTP request. process.nextTick(function(){ next(new Error('oh no!')); }); }); // the error handler is placed after routes // if it were above it would not receive errors // from app.get() etc app.use(error); /* istanbul ignore next */ if (!module.parent) { app.listen(3000); console.log('Express started on port 3000'); }