I use joi for validation and am trying to validate a ments textarea content in the following way:

const schema = Joi.object().keys({
    firstName: Joi.string().alphanum().min(3).max(30).required(),
    lastName: Joi.string().alphanum().min(3).max(30).required(),
    pany: Joi.string().alphanum().min(3).max(30).required(),
    ments: Joi.string().alphanum().min(30).max(1500).required(),
    email: Joi.string().email().required()
});

However, if anyone enters a ma or fullstop, the validation fails. How can I add those exceptions to the validation?

I use joi for validation and am trying to validate a ments textarea content in the following way:

const schema = Joi.object().keys({
    firstName: Joi.string().alphanum().min(3).max(30).required(),
    lastName: Joi.string().alphanum().min(3).max(30).required(),
    pany: Joi.string().alphanum().min(3).max(30).required(),
    ments: Joi.string().alphanum().min(30).max(1500).required(),
    email: Joi.string().email().required()
});

However, if anyone enters a ma or fullstop, the validation fails. How can I add those exceptions to the validation?

• javascript
• node.js
• validation
• joi

3 Answers 3

Since you probably would want to allow people to anything in the ments field, I would simply leave out the alphanum for the ments validation, like this:

const schema = Joi.object().keys({
    firstName: Joi.string().alphanum().min(3).max(30).required(),
    lastName: Joi.string().alphanum().min(3).max(30).required(),
    pany: Joi.string().alphanum().min(3).max(30).required(),

    // note: no alphanum here
    ments: Joi.string().min(30).max(1500).required(),

    email: Joi.string().email().required()
}); 

If you really, really must have ments that contain only letters, numbers, mas and periods, you could resort to using the regex rule:

const schema = Joi.object().keys({
    // ...
    ments: Joi.string().regex(/^[,. a-z0-9]+$/).required(),
    // ...
}); 

You can use a regex that includes alphanumeric characters plus ma. I have no idea what you mean by fullstop btw.

Joi.string().regex(/^[a-zA-Z0-9, ]*$/, 'Alphanumerics, space and ma characters').min(3).max(30).required()

Note this will literally only match the characters in ranges a-z, A-Z, 0-9 and the space and ma characters. Anything else (like the period character, brackets, parenthesis?) you would need to add.

Source is the Joi API docs.

You can simply use Regex syntax for the same ments: Joi.string().regex(/^[a-zA-Z0-9,. ]*$/).min(3).max(30).required()