Errors

throw new Error('undefined is undefined in anon:30')

Operational vs Exceptional

• https://www.joyent.com/developers/node/design/errors
• Operational errors represent run-time problems experienced by correctly-written programs
• Programmer errors are bugs in the program

Catching errors

• Catch and respond to op errors, log exceptional at the correct level and throw up
• Controllers in express... on next tick >_<

Uncaught exception handling

• Crash and burn!
• "By the very nature of how throw works in JavaScript, there is almost never any way to safely 'pick up where you left off', without leaking references, or creating some other sort of undefined brittle state."
• http://nodejs.org/api/domain.html#domain_warning_don_t_ignore_errors

Error, VError and WError

• Getting more context from your errors
• https://github.com/davepacheco/node-verror

Bluebird hacks

• .error vs .catch
• https://github.com/petkaantonov/bluebird/blob/master/API.md

Domains

• http://nodejs.org/api/domain.html
• Good for clustering and streams

Errors in streams (Errors in gulp) -> shitty errors

• emit the error event! but wait....
• gulp-plumber or event-stream get around this
• or wrap your stream up in a domain, this preserves stack traces
• Huge thread on how shit errors are in {node|io}.js: nodejs/node#89

Logging

• https://github.com/trentm/node-bunyan
• https://github.com/flatiron/winston
• https://loggly.com

Error notification

• https://getsentry.com/welcome/
• https://raygun.io/
• https://bugsnag.com