我正在使用 multer 在 NodeJS 中编写图片上传代码
我的代码是
var upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 5
},
fileFilter: (req, file, cb) => {
if (file.mimetype == "image/png" || file.mimetype == "image/jpg" || file.mimetype == "image/jpeg") {
cb(null, true);
} else {
return cb(JSON.stringify({ "success": false, "message": "invalid mime type" }), false);
}
}
});
router.post('/upload', upload.single('image'), (req, res, next) => {
const io = req.app.get('io');
const product = new db.product({
name: req.body.name,
category: req.body.category,
image: req.protocol + "://" + req.hostname + ":" + req.socket.localPort + "/img/roundtshirt/" + req.file.filename
});
});
当我从 Postman 上传无效文件时,我收到以下错误,例如我的回调
<pre>{"success":false,"message":"invalid mime type"}</pre>
但是,我想将该错误转换为正确的 json 格式。
我尝试返回 json 但出现错误。
最佳答案
您可以使用 自定义错误处理 来自 Multer here
这是我的例子:
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 5
},
fileFilter: (req, file, cb) => {
if (file.mimetype == "image/png" || file.mimetype == "image/jpg" || file.mimetype == "image/jpeg") {
cb(null, true);
} else {
return cb(new Error('Invalid mime type'));
}
}
});
const uploadSingleImage = upload.single('image');
app.post('/upload', function (req, res) {
uploadSingleImage(req, res, function (err) {
if (err) {
return res.status(400).send({ message: err.message })
}
// Everything went fine.
const file = req.file;
res.status(200).send({
filename: file.filename,
mimetype: file.mimetype,
originalname: file.originalname,
size: file.size,
fieldname: file.fieldname
})
})
})
完整示例代码,请访问https://gist.github.com/huynhsamha/348722d47ee457454688698ff77fee1a
感谢阅读:D
关于node.js - 如何在 multer 中将 cb 错误转换为 json 格式,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60725016/