app-get-method.js

// Find phone numbers from given array
let findPhoneNumbers = async arrayOfNumbers => {
    // Object to hold returned phone numbers
    let numbersArray = {
        validNumbers: [],
        invalidNumbers: []
    };

    // Filter through the array looking for numbers
    for (let i = 0; i < arrayOfNumbers.length; i++) {
        let currentNumber;
        let numWasFound = true;
        try {
            currentNumber = phoneUtil.parse(arrayOfNumbers[i], 'CA');
        }
        catch (error) {
            numWasFound = false;
        }

        if (numWasFound) {
            // Format the found phone number into (xxx) xxx-xxxx
            let tempNumb = phoneUtil.format(currentNumber, PNF.NATIONAL);
            // Note: Google's library will only properly format the number if it is a valid one
            // Which is why I do this check and place the number into the correct array
            if (tempNumb.includes('(')) {
                numbersArray.validNumbers.push(tempNumb);
            }
            else {
                numbersArray.invalidNumbers.push(tempNumb);
            }
        }
    }

    return numbersArray;
}

app.get(`/api/phonenumbers/parse/text/:givenText?`, async (request, response) => {
    // Check if param was passed
    if (request.params.givenText) {
        // Replace anything that isn't a number or a comma with nothing
        // split into array by splitting on commas
        let userData = request.params.givenText.replace(/[^0-9,]/g, '').split(',');
        let numbersFound = await findPhoneNumbers(userData);

        response.json(numbersFound);
    }

    else {
        response.status(400).json([]);
    }

});