Express validator ".isEmpty()" not working - node.js

Question

When I try to run my application I get an error saying that text boxes that are not empty are empty.
app.js:
https://pastebin.com/5pbVG7kq
index.hbs:
https://pastebin.com/neVV4X78

Answer 1

EDIT:
With express-validator, you need to use the "notEmpty()" function instead of validator's module "isEmpty()", which is not referenced in the readme.md. I tried it out with an empty string and without sending the parametr and it works fine in both cases.
OLD REPLY:
I'm facing the same issue with express-validator. I submitted the issue to the github respository so we have to wait for them to address the problem.
As a workaround in the meantime, you can use the isEmpty() function of the validator package directly.
var validator = require('validator');
validator.isEmpty(string) //returns true or false
Also note that validator only accepts a string value and it doesn't coerce the variable passed to it as opposed to express-validator, so you will need to handle the case when the parameter obtained via req.body.param is not sent.
Here is the link to the reported issue: https://github.com/ctavan/express-validator/issues/336
Hope this helps.

Answer 2

2019 express-validator
6.2.0
Here is what I use for now and it works perfect
app.js
const express = require('express');
const {createPost} = require('../controllers/post');
// Import check only form express-validator
const {check} = require('express-validator');
const router = express.Router();
router.post('/post',[
// Title
check('title').not().isEmpty().withMessage('Title is required.'),
check('title').isLength({
min:4,
max:150
}).withMessage('Title must be between 4 to 150 characters.'),
check('body').not().isEmpty().withMessage('Body is required.'),
check('body').isLength({
min:4,
max:2000
}).withMessage('body must be between 4 to 2000 characters.')
],createPost)
** Folder '../controllers/post'**
post.js
// Import validation result only from expres-validator
const {validationResult } = require('express-validator');
// Post model file with custom implementation.
const Post = require('../models/post');
exports.createPost = (req, res) => {
// Grab your validation errors here before making any CREATE operation to your database.
const errors = validationResult(req);
if (!errors.isEmpty()) {
const firstError = errors.array().map(error => error.msg)[0];
return res.status(400).json({ error: firstError });
}
const post = new Post({
title: req.body.title,
body: req.body.body
});
// Now you can safely save your data after check passes.
post.save()
.then(result => {
res.status(200).json({
post: result
})
});
};