Localization

FormValidation.formValidation(
    document.getElementById('loginForm'),
    {
        fields: {
            username: {
                validators: {
                    notEmpty: {
                        message: 'The username is required'
                    },
                    stringLength: {
                        message: 'The username must be more than 6 and less than 30 characters long',
                        ...
                    },
                    regexp: {
                        message: 'The username can only consist of alphabetical, number and underscore',
                        ...
                    },
                }
            },
            password: {
                validators: {
                    notEmpty: {
                        message: 'The password is required'
                    },
                    stringLength: {
                        message: 'The password must have at least 8 characters',
                        ...
                    },
                }
            },
        },
        plugins: {
            ...
        }
    }
);

document.addEventListener('DOMContentLoaded', function(e) {
    const fv = FormValidation.formValidation(
        document.getElementById('demoForm'),
        {
            // Set the default locale
            locale: 'en_US',
            localization: FormValidation.locales.en_US,
            
            // Ignore the message option
            // It will be taken from the language package
            fields: {
                username: {
                    validators: {
                        notEmpty: {
                        },
                        stringLength: {
                            min: 6,
                            max: 30,
                        },
                        regexp: {
                            regexp: /^[a-zA-Z0-9]+$/
                        },
                    }
                },
                password: {
                    validators: {
                        notEmpty: {
                        },
                        stringLength: {
                            min: 8
                        },
                    }
                },
            },
            plugins: {
                ...
            },
        }
    );
});