Created
January 3, 2012 05:30
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Properties of Error instances in the latest V8 included by node@0.6.6 are not enumerable. And thus cannot be serialized through JSON.stringify
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> var err = new Error('wtf?'); | |
> JSON.stringify(err) | |
'{"stack":"Error: wtf?\\n at [object Context]:1:11\\n at Interface.<anonymous> (repl.js:179:22)\\n at Interface.emit (events.js:64:17)\\n at Interface._onLine (readline.js:153:10)\\n at Interface._line (readline.js:408:8)\\n at Interface._ttyWrite (readline.js:585:14)\\n at ReadStream.<anonymous> (readline.js:73:12)\\n at ReadStream.emit (events.js:81:20)\\n at ReadStream._emitKey (tty_posix.js:307:10)\\n at ReadStream.onData (tty_posix.js:70:12)","message":"wtf?"}' | |
> Object.keys(err); | |
[ 'stack', 'arguments', 'type', 'message' ] | |
> Object.getOwnPropertyDescriptor(err, 'stack'); | |
{ get: [Function], set: [Function], enumerable: true, configurable: true } | |
> process.versions.v8 | |
'3.1.8.26' |
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$ node | |
> var err = new Error('wtf?'); | |
undefined | |
> JSON.stringify(err); | |
'{}' | |
> Object.keys(err); | |
[ ] | |
> Object.getOwnPropertyDescriptor(err, 'stack'); | |
{ get: [Function], set: [Function], enumerable: false, configurable: true } | |
> console.dir('wtffff fuuuuuuu'); | |
'wtffff fuuuuuuu' | |
> process.versions.v8 | |
'3.6.6.14' |
Dirty hack fix would be something like having Error.prototype.toJSON
return an object with the enumerable properties
Error.prototype.toJSON = function () {
var json = {};
Object.getOwnPropertyNames(this).forEach(addToJSON, this);
return json;
function addToJSON(name) {
var pd = Object.getOwnPropertyDescriptor(this, name);
pd.enumerable = true;
Object.defineProperty(json, name, pd);
}
}
I can confirm this is still an issue in v8 3.14.5.9 and node 0.10.15
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I had the problem in v0.6.6. Was wondering why do we have a ghost error object!