javascript - Trim input values before express-validator in Node.Js - Stack Overflow

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I'm using the suggested V4 syntax of express-validator in a Node.js project:

const { check, validationResult } = require('express-validator/check');
const { matchedData } = require('express-validator/filter');

and

app.post('/users/add/',[
check('first_name')
.isLength({ min: 1 }).withMessage('A first name is required')],
(req, res, next) => {
  var errors = validationResult(req);
  if (errors) {
     ..etc

Note that I am using the modern syntax and do not have the following code (as per the express-validator README.md file):

const expressValidator = require('express-validator');
app.use(expressValidator());

How do I trim blank spaces from the input field before running the validation?

I'm using the suggested V4 syntax of express-validator in a Node.js project:

const { check, validationResult } = require('express-validator/check');
const { matchedData } = require('express-validator/filter');

and

app.post('/users/add/',[
check('first_name')
.isLength({ min: 1 }).withMessage('A first name is required')],
(req, res, next) => {
  var errors = validationResult(req);
  if (errors) {
     ..etc

Note that I am using the modern syntax and do not have the following code (as per the express-validator README.md file):

const expressValidator = require('express-validator');
app.use(expressValidator());

How do I trim blank spaces from the input field before running the validation?

• javascript
• node.js
• validation
• express-validator

Share Improve this question Follow asked Sep 14, 2017 at 7:48 SteveCSteveC 68777 silver badges1212 bronze badges 1

• As of v4.1.1, sanitization is only available in the legacy APIs, but please open an issue in the GitHub tracker requesting support in the new APIs. – gustavohenke Commented Sep 14, 2017 at 11:55

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2 Answers 2

Sorted by: Reset to default 6

You should use .trim() before your .check() like this,

check('first_name').trim().isLength({ min: 1 }).withMessage('A first name is required')]

Hope this helps!

The following work around may help, though I think the best solution would be to support sanitation in a fluent manner. The downside of my work around is that the processing of input is now in two places.

1. Add the required sanitation functions to requires clause:

   const { trim } = require('express-validator').validator
   

2. Adjust the request processing:

   app.post('/users/add/',
    (req, res, next) => {
   req.body.first_name = trim(req.body.first_name);
   req.body.last_name = trim(req.body.last_name);
   req.body.email = trim(req.body.email);
   next();
   },
   [check('first_name')
   .isLength({ min: 1 }).withMessage('A first name is required')],
   (req, res, next) => {
    var errors = validationResult(req);
    if (errors) {
   ..etc
   

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