How to check if input in input field has alphabets only in express-validator

Question

I'm trying to give error if the input field i.e name not only consists of alphabets in express-validator

req.check('name')
     .isLength({min:3}).withMessage('Name must be of 3 characters long.')
     .isAlpha().withMessage('Name must be alphabetic.');

but when i enter "John Doe" in "name" input field it says "Name must be alphabetic" instead of successful validation

Answer 1

.isAlpha() method description from validator.js documentation (express-validator is also a wrapper for validation functions of this module):

check if the string contains only letters (a-zA-Z)

Your string John Doe contains a whitespace, that's why validation is not succesfull.

Your validation chain can be this one:

req.check('name')
   .isLength({min:3}).withMessage('Name must be of 3 characters long.')
   .matches(/^[A-Za-z\s]+$/).withMessage('Name must be alphabetic.')

.isAlpha() is replaced with matches(). Validation is successful when name is a string with 3 characters and more (alphabetic characters or whitespaces only).

Source: validator.js validators