node.js 捕获 express bodyParser 错误
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Catch express bodyParser error
提问by Gabriel Llamas
I want to catch the error from the bodyParser() middleware when I send a json object and it is invalid because I want to send a custom response instead of a generic 400 error.
我想在发送 json 对象时从 bodyParser() 中间件中捕获错误，但它无效，因为我想发送自定义响应而不是通用 400 错误。
This is what I have and it works:
这就是我所拥有的并且它有效：
app.use (express.bodyParser ());
app.use (function (error, req, res, next){
//Catch bodyParser error
if (error.message === "invalid json"){
sendError (res, myCustomErrorMessage);
}else{
next ();
}
});
But this seems to me a very ugly approach because I'm comparing the error message which could change in future express versions. There's any other way to catch bodyParser() errors?
但这在我看来是一种非常丑陋的方法，因为我正在比较可能在未来快速版本中更改的错误消息。还有其他方法可以捕获 bodyParser() 错误吗？
EDIT:
编辑：
This is the error when the request body has an invalid json:
这是请求正文包含无效 json 时的错误：
{
stack: 'Error: invalid json\n at Object.exports.error (<path>/node_modules/express/node_modules/connect/lib/utils.js:55:13)\n at IncomingMessage.<anonymous> (<path>/node_modules/express/node_modules/connect/lib/middleware/json.js:74:71)\n at IncomingMessage.EventEmitter.emit (events.js:92:17)\n at _stream_readable.js:872:14\n at process._tickDomainCallback (node.js:459:13)',
arguments: undefined,
type: undefined,
message: 'invalid json',
status: 400
}
Pretty printed stack:
漂亮的印刷堆栈：
Error: invalid json
at Object.exports.error (<path>/node_modules/express/node_modules/connect/lib/utils.js:55:13)
at IncomingMessage.<anonymous> (<path>/node_modules/express/node_modules/connect/lib/middleware/json.js:74:71)
at IncomingMessage.EventEmitter.emit (events.js:92:17)
at _stream_readable.js:872:14
at process._tickDomainCallback (node.js:459:13)
采纳答案by Gabriel Llamas
Ok, found it:
好的，找到了：
bodyParser() is a convenience function for json(), urlencoded() and multipart(). I just need to call to json(), catch the error and call to urlencoded() and multipart().
bodyParser() 是 json()、urlencoded() 和 multipart() 的便捷函数。我只需要调用 json()，捕获错误并调用 urlencoded() 和 multipart()。
app.use (express.json ());
app.use (function (error, req, res, next){
//Catch json error
sendError (res, myCustomErrorMessage);
});
app.use (express.urlencoded ());
app.use (express.multipart ());
回答by robertklep
I think your best bet is to check for SyntaxError:
我认为你最好的办法是检查SyntaxError：
app.use(function (error, req, res, next) {
if (error instanceof SyntaxError) {
sendError(res, myCustomErrorMessage);
} else {
next();
}
});
回答by Daniel Pérez
From the answer of @alexander but with an example of usage
来自@alexander的回答，但有一个用法示例
app.use((req, res, next) => {
bodyParser.json({
verify: addRawBody,
})(req, res, (err) => {
if (err) {
console.log(err);
res.sendStatus(400);
return;
}
next();
});
});
function addRawBody(req, res, buf, encoding) {
req.rawBody = buf.toString();
}
回答by Erick Garcia
what I did was just:
我所做的只是：
app.use(bodyParser.json({ limit: '10mb' }))
// body parser error catcher
app.use((err, req, res, next) => {
if (err) {
res.status(400).send('error parsing data')
} else {
next()
}
})
回答by dudko
I found checking for SyntaxErrorto be not enough, therefore I do:
我发现检查SyntaxError是不够的，因此我这样做：
if (err instanceof SyntaxError &&
err.status >= 400 && err.status < 500 &&
err.message.indexOf('JSON') !== -1) {
// process filtered exception here
}
回答by Alexander Aleksandrovi? Klimov
(bodyParser, req, res) => new Promise((resolve, reject) => {
try {
bodyParser(req, res, err => {
if (err instanceof Error) {
reject(err);
} else {
resolve();
}
});
} catch (e) {
reject(e);
}
})
Bullet-proof. Future-aware. WTFPL-Licensed. And also useful w/ async/await.
防弹。未来意识。WTFPL-许可。并且也很有用，带有异步/等待。
