validating-an-array-of-objects-in-strickland.js

var strickland = require("strickland");
var validate = strickland.default;
var required = strickland.required;
var length = strickland.length;
var minLength = strickland.minLength;
var form = strickland.form;

var data = {
    name: '',
    phones: [
        {
            areaCode: '555',
            number: '555-1234'
        },
        {
            areaCode: '555',
            number: '1234'
        }
    ]
}

var phoneValidator = {
    areaCode: length(3, 3),
    number: length(8, 8)
};

function phonesValidator(phones, context) {
    if (phones && !Array.isArray(phones)) {
        return false;
    }

    var isValid = true;
    var validationResults = phones.map((phone) => {
        var result = validate(phoneValidator, phone, context);
        isValid = isValid && result.isValid;

        return result;
    });

    return {
        isValid,
        validationResults,
        ...(isValid ? {} : { message: 'At least one phone number is invalid' })
    };
}

var validator = {
    name: required({message: 'name is required'}),
    phones: [
        minLength(1, { message: 'You must specify at least one phone number' }),
        phonesValidator
    ]
};

var result = validate(validator, data);
console.log(JSON.stringify(result, null, 2));

Pardon the lack of ES6 usage -- I whipped this up super quick without any tooling

I could imagine an arrayOf higher-order validator too.

var validator = {
    name: required({message: 'name is required'}),
    phones: [
        minLength(3, {message: 'You must specify at least one phone number'}),
        arrayOf({
            areaCode: length(3, 3),
            number: length(7, 7)
        })
    ]
};

See jeffhandley/strickland#36