"Required if" custom validator

Hi! I’m trying to achieve a “required if” behavior using a custom validator. But since .optional() disables the validators when the value is not provided, the custom validator is never called. Is there any way to force it to be called or can I programmatically call other validators in my custom validator?

I’m using version 5.3.0.

Sample code

const express = require('express')
const { body, validationResult } = require('express-validator/check')

const app = express()
app.use(express.urlencoded({ extended: true }))

app.post('/',
  body('url')
    .custom((value, { req }) => {
      console.log('I\'m never called when .optional() is set :(')

      if (req.body.param && !value) {
        throw new Error('url is required if "param" was provided');
      }

      // can I call `.isURL()` here, so I can skip the `.optional()`?
      return true
    })
    .optional()
    .isURL().withMessage('Invalid URL'),
  body('param').optional(),
  (req, res) => {
    res.send(validationResult(req).array())
  });

app.listen(3000)

Thanks!

[mwergles]

Thanks! I haven’t thought about it. This totally worked!

[lock[bot]]

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