How to validate the length of character is equals to 5 using express-validator?

Question

I am planning to make partnerid field character length as 5 which means user will get error message if he enters less than 5 character or more than 5 characters which will include alpha-numeric character. How can we do it using express-validator? I tried using below code but it didn't worked Thanks

   req.checkBody('partnerid', 'Partnerid field must be 5 character long ').len(5);

Answer 1

You can use isLength() option of the express-validator to check max and min length of 5:

 req.checkBody('partnerid', 'Partnerid field must be 5 character long ').isLength({ min: 5, max:5 });

Answer 2

You can use matches option of express-validator to check if the partner field only contains alphanumeric and has a length of 5

req.checkBody('partnerid', 'Partnerid field must be 5 character long ').matches(/^[a-zA-Z0-9]{5}$/, "i");

Answer 3

.len(5) not support in express validation, you can use .isLength(5) to check for a max and min length of 5.

req.checkBody('partnerid', 'Partnerid field must be 5 character long strong text').isLength(5);