JS helper to Parse validation errors and messages returned by https://github.com/hapijs/joi

joi-parse-validation.js

'use strict';
const _ = require('lodash');

const parseReason = function (message) {

    const regexBecause = /because \[(.*?)(\]|$)/;
    let parsedMessage = message;

    if (regexBecause.test(message)) {
        parsedMessage = regexBecause.exec(message)[1];
    }

    if (regexBecause.test(parsedMessage)) {
        parsedMessage = parseReason(parsedMessage);
    }

    return parsedMessage;
};

const parseValidation = function (response) {
    
    const validation = response && response.validation;
    const message = response && response.message;
    const error = response && response.error;
    const result = {
        error: undefined,
        hasError: {},
        help: {}
    };    

    if (validation && validation.keys) {                        

        const arMessage = message.split(".");
        const arField = _.uniqBy(validation.keys, function (e) {
            return e;
        });

        // initialise length
        let intLength = arMessage.length;

        for (let i = 0 ; i <= intLength; i++ ) {
            const forField = arField[i];
            const reason = parseReason(arMessage[i]);

            result.hasError[forField] = true;
            result.help[forField] = reason;
        }        
    }    
    else if (message) {
        result.error = message;
    }
    else if (error) {
        result.error = error;
    }

    return result;
};


module.exports = parseValidation;