A script to extract all numbers from a Whatsapp community which you're an admin of.

whatsapp_community_extractor.js

// A script to extract numbers of all members of a Whatsapp Community
// The client should be a "Community Admin" before running this script.

const CONTAINER_IDENTIFIER = '.xyw6214.x78zum5.x1r8uery';
const NUMBER_IDENTIFIER = '.x15g3fpr span.x1iyjqo2';
const SIDE_NUMBER_IDENTIFIER = 'span._ao3e';
const COMMUNITY_NAME = 'span.x1lliihq.xh8yej3';
const DEF_DELAY = 200;

function grabNormalNumbers() {
    const normalNumbers = [];
    const elements = document.querySelectorAll(NUMBER_IDENTIFIER);
    for (element of elements) {
        if (element.innerHTML.includes('+')) {
            element.style.border = "2px solid red"
            normalNumbers.push(element.innerHTML)
        }
    }
    return normalNumbers;
}

function grabOnlyNumbers() {
    const onlyNumbers = [];
    const allElements = document.querySelectorAll(SIDE_NUMBER_IDENTIFIER);
    for (let element of allElements) {
        if (element.className === "_ao3e" && element.innerHTML.includes('+')) {
            element.style.border = "2px solid red"
            onlyNumbers.push(element.innerHTML);
        }
    }
    return onlyNumbers;
}

function slugify(str) {
    const processed = str.replace(/[\W_]+/g, " ");
    return processed.trim().replaceAll(' ', '-');
}

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms || DEF_DELAY));
}

async function automate() {
    const numbers = new Set();
    let counter = 0;
    let oldSize = numbers.size;

    function grabNumbers() {
        const currentNumbers = grabNormalNumbers().concat(grabOnlyNumbers())
        for (let number of currentNumbers) {
            numbers.add(number);
        }
        const diff = numbers.size - oldSize;
        if (diff) {
            console.log(`%c${diff} numbers extracted...`, 'color:gray;font-style:italic');
        }
    }

    const containers = document.querySelectorAll(CONTAINER_IDENTIFIER);
    const container = containers[0];
    if (!container || containers.length !== 2) {
        return alert("You do not have the members tab open.");
    }
    container.style.border = "4px solid green";

    let title = document.querySelector(COMMUNITY_NAME).innerText;
    if (!title) {
        title = prompt("Could not retrieve community name. Please enter manually:")
    }

    const name = slugify(title);

    console.log("%cWhatsapp Community Extractor", "color:#25d366;font-size:2rem;font-weight:bold")
    console.log("%cextracting...", "color:yellow;font-size:2rem")
    console.log(`%c${title}`, 'color: orange;font-size:1.5rem');
    const containerHeight = container.scrollHeight;
    let scroller = 0;
    container.scrollTo(0, 0);
    while (scroller < containerHeight) {
        grabNumbers();
        scroller += 200;
        await sleep(200);
        container.scrollTo(0, scroller);
    }
    console.log("%csuccess...", "color:yellow;font-size:2rem")
    const proceed = confirm(`${numbers.size} numbers extracted. Download?`);
    const asArray = Array.from(numbers);
    if (proceed) {
        const blob = new Blob([asArray.join('\n')], {
            type: "text/csv"
        });
        const url = URL.createObjectURL(blob);

        const a = document.createElement('a');
        a.href = url;
        a.download = name ? `${name}.csv` : "extraction.csv";
        a.click();
    }

    return asArray;
}

const TITLE_BAR = '._amie';
const COMMUNITY_TAB = 'button[title="Community"]'
const MEMBERS_BTN = 'div[role="button"]._alzb'

function onElementAvailable(selector, callback) {
    const observer = new MutationObserver(mutations => {
        const element = document.querySelector(selector)
        if (element) {
            observer.disconnect();
            callback(element);
        }
    });

    observer.observe(document.body, {
        childList: true,
        subtree: true
    });
}

function viewMembersTab() {
    return new Promise((resolve, reject) => {
        const canSeeMembers = document.querySelector(MEMBERS_BTN);
        if (canSeeMembers && !canSeeMembers.innerText.includes('Report')) {
            canSeeMembers.click();
            resolve();
        } else if (canSeeMembers) {
            document.querySelector(COMMUNITY_TAB).click();
            onElementAvailable(MEMBERS_BTN, (membersBtn) => {
                membersBtn.click();
                resolve();
            })
        } else {
            document.querySelector(TITLE_BAR).click();
            onElementAvailable(COMMUNITY_TAB, (communityBtn) => {
                communityBtn.click();
                onElementAvailable(MEMBERS_BTN, (membersBtn) => {
                    membersBtn.click();
                    resolve();
                })
            });
        }
    })
};

// viewMembersTab().then(automate)