node.jsexpress-validator

Express validator validate if data provided

I'm using express-validator for validation for mandatory fields. But some fields are not mandatory like date of birth, price. I want to validate if these fields contains a value, like if I provide the date of birth value, then it must be of date type. I've checked every tutorials, docs & tried almost everything, but failed. How to validate fields when it contains value. Custom method is the last option to try. can i make it without custom method?

Solution

  • You can do it with optional and checkFalsy. This will only run the isISO8601() validation on the dateOfBirth field if not is null, undefined, 0, false, or empty string

    check('dateOfBirth').optional({ checkFalsy: true }).isISO8601()