What is errorhandler?
The errorhandler npm package is an error handler middleware for use with Express.js applications. It provides full stack traces and error message responses for errors during development, and a minimal response not leaking internal information in production.
What are errorhandler's main functionalities?
Development Error Handling
In a development environment, errorhandler can provide detailed stack traces and error messages to the console and the client, helping developers debug issues.
app.use(errorhandler({ log: errorNotification }))
function errorNotification(err, str, req) {
var title = 'Error in ' + req.method + ' ' + req.url;
console.error(title, str);
}
Production Error Handling
In a production environment, errorhandler can be used to send a generic error message to the client, without leaking sensitive stack trace information.
if (process.env.NODE_ENV === 'production') {
app.use(errorhandler());
}
Other packages similar to errorhandler
express-async-errors
This package is a drop-in replacement for Express's default error handler. It automatically catches errors from async routes and passes them to your error handlers. It does not provide the same level of detail for stack traces as errorhandler, but it is useful for handling errors in asynchronous code.
strong-error-handler
This is an error handler for use with Express.js applications, similar to errorhandler. It is designed to provide a more secure, production-ready error handling solution. It can be configured to hide or show stack traces and error details based on the environment.
errorhandler
Previously connect.errorHandler()
.
Install
$ npm install errorhandler
API
errorhandler()
Create new middleware to handle errors and respond with content negotiation.
This middleware is only intended to be used in a development environment, as
the full error stack traces will be send back to the client when an error
occurs.
Example
var connect = require('connect')
var errorhandler = require('errorhandler')
var app = connect()
if (process.env.NODE_ENV === 'development') {
app.use(errorhandler())
}
License
The MIT License (MIT)
Copyright (c) 2014 Jonathan Ong me@jongleberry.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.