multer-req文件未定义，但为什么

Question

有人能告诉我为什么我的req.file没有定义吗？我添加内容头类型，我添加了single.photo，但我没有数据

前端：

## data is equal to this:
Object {
"filename": "3ccc61e1-3c49-4538-9594-b4987b3fa66f.jpg",
"type": "image/jpg",
"uri": "file:///data/user/0/host.exp.exponent/cache/ExperienceData/UNVERIFIED-xxxxx-test/ImagePicker/3ccc61e1-3c49-4538-9594-b4987b3fa66f.jpg",
}
const uploadStory = async data => {
try {
const form = new FormData();
form.append('photo', data);
const options = {
headers: {
'Content-Type':'multipart/form-data',
'Accept':'application/json'
},
method: 'POST',
body: form
};
const res = await fetch('http://xxxxxxx.xx:3000/createstory', options);
const out = await res.json();
return out;
} catch(e) {
console.log(e);
return e;
}
};
export default uploadStory;

后端：

const multer = require('multer');
const storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, 'uploads/')
},
filename: function(req, file, cb) {
console.log(req);
cb(null, `${file.filename}-${Date.now()}`)
}
});
const upload = multer({
storage: storage
}).single('photo');
module.exports = async (req, res, next) => {
upload(req, res, function(err) {
if(err) {
console.log(err)
return;
} else if (err instanceof multer.MulterError) {
console.log(err);
} else {
console.log(req.file);
console.log('hi')
}
});
};

。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。…………..

Answer 1

确保您的数据对象看起来像这个

{
name: "3ccc61e1-3c49-4538-9594-b4987b3fa66f.jpg",
type: "image/jpg",
uri: "file:///data/user/0/host.exp.exponent/cache/ExperienceData/UNVERIFIED-xxxxx-test/ImagePicker/3ccc61e1-3c49-4538-9594-b4987b3fa66f.jpg",
}

在data对象中，key是filename，而不是name

将upload更改为此

const upload = multer({
storage: storage,
});

然后，

module.exports = upload.single('photo'), async (req, res) => {
try {
console.log(req.body); // Body Here
console.log(req.file); // File Here
res.status(500).send('Fetch Completed Successfully');
} catch (error) {
console.log(error);
res.status(500).send('Error');
}
}