Reply to this Comment tangxinfa Nov 4, 2015 at 12:55 AM 1 Comments Nice post, this is a ready to work solution.As a enhancement, you can use verror(https://www.joyent.com/developers/node/modules/verror) as the base Error was originally a character in the hit video game, "Zelda". If you need additional methods/properties, you can add them to the object before returning it. URIError An error when encoding or decoding the URI has occurred (ie: when calling encodeURI()). this contact form
But it's a bit tricky to correctly create a custom error class in Node.js, so here is an example. Tweet This Groovy post by @BenNadel - Creating Custom Error Objects In Node.js With Error.captureStackTrace() Thanks my man — you rock the party that rocks the body! This is basically zero value-add.this.name = "AppError";// Since I am used to ColdFusion, I am modeling the custom error structure on the// CFThrow functionality. So, for example, if we were to generate the stacktrace inside of an error Factory function, we could tell V8 to exclude the factory function when generating the stack. more info here
calidion commented Jul 10, 2016 Thanks for the code snippet. Periodically, I see people throwing errors by just providing the string, such as this: throw "message"; Doing so will cause an error to be thrown, but not all browsers respond the Subscribe by Email Enter your email address: Sponsors My Books More of Me Twitter Follow @slicknet LinkedIn GitHub Slideshare Amazon Google+ Archives 2015 2014 2013 2012 2011 2010 2009 2008 2007 The common way to do this is demonstrated below.
Do not use it on production sites facing the Web: it will not work for every user. machine learning Make a "Ceeeeeeee" program Can Mage Hand wield a Shield? You'd break this rule if you somehow changed what notFound.statusCode did. Es6 Extend Error Sometimes writing error handling code feels like a chore, but it shouldn't be an afterthought.
Overrides the Object.prototype.toString() method. Share Clone via HTTPS Clone with Git or checkout with SVN using the repository's web address. ReferenceError An illegal reference has occurred. Also, notice with NotImplementedError2, when I don't set the .name explicitly, it is equal to "Error".
asked 7 years ago viewed 67457 times active 30 days ago Upcoming Events 2016 Community Moderator Election ends in 3 days Linked 1 How to throw error properly for a missing Venemo commented Jun 8, 2015 In the test suite, there is a small typo: assert(err.name = 'CustomError'); should be assert(err.name === 'CustomError'); or assert.strictEqual(err.name, 'CustomError'); tallesl commented Jul 10, 2015 Error.captureStackTrace It allows instanceof checks to behave as usual plus type and message are correctly reported in Firefox and V8 (Chome, nodejs). his comment is here Why Custom Error Objects?
In the V8 engine, the stacktrace of an error is gathered using the Error.captureStackTrace() method:Error.captureStackTrace( errorObject, localContextFunction )This method injects a "stack" property into the first argument and, optionally, excludes the If you're using an API like this, you'll probably use something like if (err) return handleError(err) at the top of your callback. ECMAScript 5.1 (ECMA-262)The definition of 'Error' in that specification. I'm saying the call to Error here is constructing a new object, which is thrown away; not initializing the already constructed object which is assigned to nie. –Dave Jul 29 '13
It is succint and the exception created this way will behave correctly in all situations. Input Validation Example This example examines input. If you've written a database layer, don't raise the previous NotFound error from something that loads data from the database. share|improve this answer edited Aug 10 '13 at 0:50 answered May 16 '12 at 11:56 sinisterchipmunk 1,5261217 This answer doesn't set the message...
You may need an array of error messages or some kind of error code in addition to the error message. Featured node errors The Art of Error Posted by Alex R. If the value is wrong, an exception (err) is thrown. I only noticed today while browsing my history.