expressjs / expressjs/multer

how can I upload image or json file ?

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JavaScript
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Description

when I tried to upload json file, I found this error:
`MulterError: Unexpected field
at wrappedFileFilter (E:\nodejs-projects\uploadFiles\node_modules\multer\index.js:40:19)
at Multipart. (E:\nodejs-projects\uploadFiles\node_modules\multer\lib\make-middleware.js:107:7)
at Multipart.emit (node:events:513:28)
at HeaderParser.cb (E:\nodejs-projects\uploadFiles\node_modules\busboy\lib\types\multipart.js:358:14)
at HeaderParser.push (E:\nodejs-projects\uploadFiles\node_modules\busboy\lib\types\multipart.js:162:20)`

how can I upload json file and add extension of file ? what abou Xlsx files ?

Contributor guide

Open the contributing guide

Research direction

Start with Multer's upload configuration and the multipart field name used by the request, then review how the reported Unexpected field error relates to that configuration. Clarify the documented process and supported behavior for JSON, image, and XLSX uploads, including how file extensions are handled.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, node.js
Domain
api, backend
Issue type
Documentation
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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