- logs errors based on environment
- development gets full color-coded errors
- production error logs use syslog error headings so they will be picked up by logwatch et al
- production only logs serious errors (level 3 and below) to reduce noise
- request attrs logged if passed request object
- response returned if passed response object
var logErrors = require('log-errors'),
logProd = logErrors.production,
logDev = logErrors.development;
try {
throw new error("funky");
} catch (e) {
logDev(e);
}This will output in colored text:
Error name: Error
Error object:
{ Error: funky,
message: 'funky',
type: undefined,
stack: Getter/Setter,
arguments: undefined }
Stack trace:
'Error: funky
at Object.<anonymous> (/home/andy/lib/modules/npm/log-errors/lib/development.js:16:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)'It will also log request url + query info.
var logErrors = require('log-errors'),
logProd = logErrors.production,
logDev = logErrors.development;
// add this at very bottom (below all route handlers)
// it is designed to catch the errors passed by next(err) calls
app.configure('production', function() {
app.use(logProd);
});
app.configure('development', function() {
app.use(logDev);
// equates to:
// app.use(function(err, req, res, next) {
// logDev(err, req, res, next);
// });
});Example Output:
Error name: Error
Request:
url: someurl
query: ?some=random&query=params
Error object:
{ Error: funky,
message: 'funky',
type: undefined,
stack: Getter/Setter,
arguments: undefined }
Stack trace:
'Error: funky
at Object.<anonymous> (/home/andy/lib/modules/npm/log-errors/lib/development.js:16:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)'- error name: (err.name)
- error message (err.message)
- error logLevel (err.logLevel)
- error responseCode (err.resCode)
- request url (req.url)
- request query (req.query)
If passed a response object then the logger will return this with the response code specified in the error (err.resCode). It defaults to sending a 500 server error with the body {error: 'Error'}.
var logErrors = require('log-errors'),
logDev = logErrors.development;
// will call res.send(403, {"error":"random"})
logDev({resCode:403, name:"random"}, req, res);- Must be one of the 8 unix log levels used in the Visionmedia Logging Module.
- Defaults to 'info' level if not passed one of the 8 listed.
- Production and development loggers inherit from this.
- If app is an eventEmitter then the 'seriousError' evt will be prodcast when using the productionLogger.
var LogClass = function (env, app) {
this.env = env;
this.app = app;
};- Always prints full error in colored text.
var logDev = require('log-errors').development;
logDev(new Error('development error msg'));- Will only print error info if error.LogLevel is 3 or below, ie ['error', 'critical', 'alert', 'emergency']
var logProd = require('log-errors').production,
err = newError('some message about the error');
err.logLevel = 'critical'
logProd(err);- If error.LogLevel is 3 or below and this.app is an eventEmitter then the 'seriousError' evt will be prodcast when using the productionLogger.
- It will NOT be broadcast if the error.doNotKill is truthy
if (!err.doNotKill) {
appErrorHandler && this.app.emit('seriousError');
}Using in Conjunction with Custom Errors npm Module
- If your errors inherit from the custom errors class then the extra error attrs (logLevel, name, message etc) are already added.
- However, the logger should work fine with the built in base error class too.
var valErr = require('custom-errors').general.ValidationError,
logErrors = require('log-errors'),
logProd = logErrors.production,
logDev = logErrors.development;
try {
throw new valErr("funky");
} catch (e) {
logDev(e);
}Outputs:
Error name: Validation
Error object:
{ logLevel: 'warn',
message: 'funky',
name: 'Validation',
resCode: 400,
[stack]: [Getter/Setter] }
Stack trace:
'Validation: funky
at Object.<anonymous> (/home/andy/lib/modules/npm/log-errors/lib/development.js:18:12)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)'
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