Invalid status code: LIMIT_UNEXPECTED_FILE - Multer Nodejs

I'm trying to create a form where it will be a field to upload multiple images, like real estate site.

In Postman, I set the body to form-data and try to post two files to http://localhost:8080/api/files/upload while server is running to check if it is working before implementing the view in React, but getting this error:

Also addition information, I'm using

app.use("/api/files", imageRoutes); // => /api/files/

RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: LIMIT_UNEXPECTED_FILE
    at new NodeError (node:internal/errors:393:5)
    at ServerResponse.writeHead (node:_http_server:343:11)
    at ServerResponse._implicitHeader (node:_http_server:334:8)
    at write_ (node:_http_outgoing:867:9)
    at ServerResponse.end (node:_http_outgoing:977:5)
    at ServerResponse.send (C:\Users\User\Downloads\yedy-react-backend-master\node_modules\express\lib\response.js:232:10)
    at ServerResponse.json (C:\Users\User\Downloads\yedy-react-backend-master\node_modules\express\lib\response.js:278:15)
    at C:\Users\User\Downloads\yedy-react-backend-master\server.js:35:7
    at Layer.handle_error (C:\Users\User\Downloads\yedy-react-backend-master\node_modules\express\lib\router\layer.js:71:5)
    at trim_prefix (C:\Users\User\Downloads\yedy-react-backend-master\node_modules\express\lib\router\index.js:326:13)

images-controllers.js

    const fs = require("fs")
    
    const uploadImage = (req, res, next) => {
        const files = req.files;
    
        if (! files) {
           res.status(400).send('Please choose files');
           return;        }
        // convert images into base64 encoding
        let imgArray = files.map((file) => {
            let img = fs.readFileSync(file.path)
    
            return encode_image = img.toString('base64')
        })
        let result = imgArray.map((src, index) => { // create object to store data in the collection
            let finalImg = {
                filename: files[index].originalname,
                contentType: files[index].mimetype,
                imageBase64: src
            }
    
            let newUpload = new UploadModel(finalImg);
    
            return newUpload.save().then(() => {
                return {msg: `${
                        files[index].originalname
                    } Uploaded Successfully...!`}
            }).catch(error => {
                if (error) {
                    if (error.name === 'MongoError' && error.code === 11000) {
                        return Promise.reject({error: `Duplicate ${
                                files[index].originalname
                            }. File Already exists! `});
                    }
                    return Promise.reject({
                        error: error.message || `Cannot Upload ${
                            files[index].originalname
                        } Something Missing!`
                    })
                }
            })
        });
    
        Promise.all(result).then(msg => { // res.json(msg);
            res.redirect('/')
        }).catch(err => {
            res.json(err);
        })
    }
    
    exports.uploadImage = uploadImage;

multer.js

    const multer = require('multer');
    
    // set storage
    var storage = multer.diskStorage({
        destination : function ( req , file , cb ){
            cb(null, 'uploads')
        },
        filename : function (req, file , cb){
            // image.jpg
            var ext = file.originalname.substr(file.originalname.lastIndexOf('.'));
    
            cb(null, file.fieldname + '-' + Date.now() + ext)
        }
    })
    
    module.exports = store = multer({ storage : storage })

image-routes.js

    const express = require("express");
    const router = express.Router()
    const store = require("../middleware/multer")
    
    const imagesController = require("../controllers/images-controllers");
    
    router.post('/upload', store.array('images', 12), imagesController.uploadImage)
    
    module.exports = router;

Solution

It looks like you are not sending images properly from the Postman. You should specify the name of images array to be images because you specified that in the Multer middleware.

You should send it like this: