customSanitizer() called twice (once before, once after validation) #571
Description
I created a super simple express setup with one validation-chain that includes a sanitizer:
'use strict';
const { check } = require('express-validator/check');
const express = require('express');
const moment = require('moment');
const app = express();
app.get(
'/',
[
check('test')
.custom(str => {
console.log('validate', str);
return moment(str, moment.ISO_8601, true).isValid();
})
.withMessage('test has to be date string YYYY-MM-DDTHH:mm:ss.SSS')
.customSanitizer(value => {
console.log('sanitize', value);
const date = value !== null ? new Date(value) : null;
return date;
}),
],
(req, res) => res.send('Hello World!')
);
app.listen(3000, () => console.log('Example app listening on port 3000!'));I would expect that the custom validation runs first and if this is successful, the result will be sanitized.
But I get the following logs:
$ node test.js
Example app listening on port 3000!
sanitize xxx
validate Invalid Date
sanitize xxx
sanitize 2012-02-02T00:00:00.000Z
validate 2012-02-02T00:00:00.000Z
sanitize 2012-02-02T00:00:00.000Z
Sanitization is run twice and even once before the validation which in my opinion doesn't make any sense.
package.json
{
"name": "test-validator",
"version": "1.0.0",
"dependencies": {
"express": "^4.16.3",
"express-validator": "^5.1.2",
"moment": "^2.22.1"
}
}