nodemon 应用程序崩溃 - 在启动之前等待文件更改... nodejs [英] nodemon app crashed - waiting for file changes before starting... nodejs
问题描述
文件未在 nodejs 中上传它显示错误,即:nodemon 应用程序崩溃 - 在启动之前等待文件更改... nodejs
file is not uploading in nodejs it shows error which is: nodemon app crashed - waiting for file changes before starting... nodejs
代码:
var path = require('path');
var express = require('express');
var multer = require('multer');
var app = express();
var Storage = multer.diskStorage({
destination: './public/uploads/',
filename: (req, file, cb) => {
cb(null, file.fieldname+"-"+Date.now()+path.extname(file.orignalname));
}
})
var upload = multer({
storage: Storage
}).single('file');
app.use(express.static(__dirname+"/public"));
app.post('/uploadFile', upload , (req, res, next) => {
res.send("Uploaded File: "+ req.file.filename);
})
app.listen(3000, () => console.log("Server Running at http://localhost:3000/"))
错误:
TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined
at validateString (internal/validators.js:125:11)
at Object.extname (path.js:830:5)
at DiskStorage.filename [as getFilename] (D:\nodejs\index.js:9:47)
at D:\nodejs\node_modules\multer\storage\disk.js:34:10
at DiskStorage.getDestination (D:\nodejs\node_modules\multer\storage\disk.js:22:51)
at DiskStorage._handleFile (D:\nodejs\node_modules\multer\storage\disk.js:31:8)
at D:\nodejs\node_modules\multer\lib\make-middleware.js:144:17
at allowAll (D:\nodejs\node_modules\multer\index.js:8:3)
at wrappedFileFilter (D:\nodejs\node_modules\multer\index.js:44:7)
at Busboy.<anonymous> (D:\nodejs\node_modules\multer\lib\make-middleware.js:114:7)
[nodemon] app crashed - waiting for file changes before starting...
推荐答案
当 nodemon 因此错误而崩溃时,这意味着您的代码存在问题,导致其无法启动.
When nodemon crashes with this error, it means there is a problem with your code which prevents it from starting.
错误信息的第一行是实际错误:
The first line of the error message is the actual error:
TypeError [ERR_INVALID_ARG_TYPE]:路径"参数必须是字符串类型.接收类型未定义
您一定是将 undefined 而不是字符串传递给了函数,我猜在这一行:
You must have passed undefined instead of a string to a function, I would guess on this line:
cb(null, file.fieldname+"-"+Date.now()+path.extname(file.orignalname));
大概在file.originalname
部分,你应该检查它是否定义
Probably in the file.originalname
part, you should check if it is defined
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