How to validate multipart/form-data in Express-validator using Nodejs

Question

A snippet of my code where i show my defined router,checking body param and checking for validation error.

My defined Post request:

router.post("/addEmployee",upload.any(), function(req, res, next) {

  /*I used multer because body data from multipart/form-data*/

var input = JSON.parse(req.body.data);

Server validation: // validation not work because req.checkBody only get bodyData now i am using multipart/form-data (req.body.data)

req.checkBody('EMPID', "**EMPID must be Integer**").notEmpty().isNumeric();

req.checkBody('PAYROLLID', "**PAYROLLID must be Integer**").notEmpty().isNumeric();


.....

....

Check validation error

var validationError = req.validationErrors(); //check error


// if (validationError) { //suppose get error -- throw that error


 res.json(validationError[0].msg);


 } else { //validation success


......strong text

Answer 1

Use express validator middleware after the multer that's why express validator work naturally

This example work for me , try this

import require dependencies

var fs = require('fs');
var path = require('path');
var multer = require('multer');
var mkdirp = require('mkdirp');

configure multer

var obj = {};
var diskStorage = multer.diskStorage({

    destination:function(req,file,cb){

        var dest = path.join(__dirname,'/uploads');

        mkdirp(dest,function(err){
            if(err) cb(err,dest);
            else cb(null,dest);
        });
    },
    filename:function(req,file,cb){
        var ext = path.extname(file.originalname);
        var file_name = Date.now()+ext;
        obj.file_name = file_name;
        cb(null,file_name);
    }
});
var upload = multer({storage:diskStorage});

prepare validation middleware

 var validator = function(req,res,next){

            req.checkBody('name').notEmpty().withMessage('Name field is required');
            req.checkBody('email')
            .notEmpty()
            .withMessage('Email field is required')
            .isEmail()
            .withMessage('Enter a valid email address')
            .isEmailExists()
            .withMessage('Email address already exists');

            req.checkBody('password').notEmpty().withMessage('Password field is required');
            req.checkBody('retype_password').notEmpty().withMessage('Retyp password field is required');

            req.checkBody('password').isEqual(req.body.retype_password).withMessage('Password and confirm password did not match.');

            req.checkBody('address').notEmpty().withMessage('Address field is required');

            req.asyncValidationErrors().then(function() {
                next();
            }).catch(function(errors) {
                req.flash('errors',errors);
                res.status(500).redirect('back');
            });

        }

save requested data into db

router.post('/store',upload.single('avatar'),validator,async function(req,res,next){

            var newUser = User({
                name:req.body.name,
                email:req.body.email,
                password:req.body.password,
                avatar:obj.file_name,
                address:req.body.address,
                created_at:new Date()
            });

            try{
                await newUser.save();
                req.flash('success_message','New user has been successfully created');
                return res.redirect('back');

            }catch(err){
                throw new Error(err);
            }
    });