请帮我摆脱这一切。这是我的 uploadRouter.js，我在其中尝试使用 multer 模块从 POSTMAN 上传图像文件
const express = require('express');
const mongoose = require('mongoose');
const autheticate = require('../authenticate');
const multer = require('multer')
const bodyParser = require('body-parser');
const storage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'public/images');
},
filename: (req, file, cb) => {
cb(null, file.originalname);
}
});
const imageFileFilter = (req, file, cb) => {
if(!file.originalname.match(/\.(jpg|jpeg|png|gif)$/)) {
return cb(new Error('You can upload only image files!'), false);
}
cb(null, true);
};
const upload = multer({ storage: storage, fileFilter: imageFileFilter});
//const uploadImgFile = multer().single('imageFile');
const uploadRouter=express.Router();
uploadRouter.use(bodyParser.json());
uploadRouter.route('/')
.get(autheticate.verifyUser,autheticate.verifyAdmin,(req,res,next)=>{
res.statusCode = 403;
res.end('GET operation not supported on /imageUpload');
})
.post(autheticate.verifyUser,autheticate.verifyAdmin,upload.single('imageFile'),(req,res,next)=>{
res.statusCode=200;
res.setHeader('Content-Type','application/json');
res.end('End');
})
.put(autheticate.verifyUser,autheticate.verifyAdmin,(req,res,next)=>{
res.statusCode = 403;
res.end('GET operation not supported on /imageUpload');
})
.delete(autheticate.verifyUser,autheticate.verifyAdmin,(req,res,next)=>{
res.statusCode = 403;
res.end('GET operation not supported on /imageUpload');
})
module.exports = uploadRouter;
我已将请求消息的主体类型设置为来自 POSTMAN 的 form-data，
但是当我上传图片时改变body-format后，POSTMAN中给出了以下错误
<body>
<h1>Unexpected token - in JSON at position 0</h1>
<h2>400</h2>
<pre>SyntaxError: Unexpected token # in JSON at position 0
at JSON.parse (<anonymous>)
at createStrictSyntaxError (F:\Cousera\Node\coursera-node-confusion-server\node_modules\body-parser\lib\types\json.js:157:10)
at parse (F:\Cousera\Node\coursera-node-confusion-server\node_modules\body-parser\lib\types\json.js:83:15)
at F:\Cousera\Node\coursera-node-confusion-server\node_modules\body-parser\lib\read.js:121:18
at invokeCallback (F:\Cousera\Node\coursera-node-confusion-server\node_modules\raw-body\index.js:224:16)
at done (F:\Cousera\Node\coursera-node-confusion-server\node_modules\raw-body\index.js:213:7)
at IncomingMessage.onEnd (F:\Cousera\Node\coursera-node-confusion-server\node_modules\raw-body\index.js:273:7)
at emitNone (events.js:106:13)
at IncomingMessage.emit (events.js:208:7)
at endReadableNT (_stream_readable.js:1055:12)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9)</pre>
</body>
</html>
POSTMAN 中包含两个 header :
1. 内容类型:'application/json'
2. 身份验证:承载[[TOKEN]]
请我无法理解错误，我是 node.js 的新手。请帮我解决这个问题
最佳答案
当您将 Content-Type 作为 application/json 传递并上传内容类型不是 json 的文件时，会出现此问题。 删除此 header ，因为它不是必需的。
关于node.js - Multer 图像上传错误 : Unexpected token - in JSON at position 0, SyntaxError: JSON 中位置 0 的意外标记 #，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50432928/