How can I validate strings using Joi?
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How can I validate strings using Joi?
You can use Joi's string() method to validate strings. For example, Joi.string().min(3).max(30).required() ensures the string is between 3 and 30 characters.
What if I want to allow only alphanumeric characters?
You can use the alphanum() method. For instance, Joi.string().alphanum().min(3).max(30).required() will enforce that the string contains only alphanumeric characters.
Can I add a custom error message?
Yes! You can use the messages() method. For example: Joi.string().min(3).messages({'string.min': 'String must be at least 3 characters long.'}).
How do I validate an email address?
You can use Joi.string().email().required() to validate that the string is a valid email address.
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