Alerts a markdown like text version of trello board's lists and cards.

trelloBoardToText.js

// Helper function to convert node lists returned by querySelectorAll to an array
// so that we can used methods like map and filter.
function toArray(nodeList) {
    let array = []
    nodeList.forEach(node => array.push(node))
    return array
}

// Returns a text (like markdown) representation of a trello board.
function trelloBoardAsText() {
    let title = document.querySelector('.board-header-btn-text').innerText
    let listText = toArray(document.querySelectorAll('.list')).map(listAsText).join('\n\n')
    return `Board: ${title}\n\n${listText}`
}

// This is how to represent a list as text.
function listAsText(list) {
    let header = list.querySelector('.list-header-name').value
    let cardText = toArray(list.querySelectorAll('.list-card-details'))
        .map(card => `- ${cardAsText(card)}`)
        .join('\n')
    return `${header}\n${'='.repeat(header.length)}\n${cardText}`
}

// And this is how to represent a card as text.
function cardAsText(card) {
    return card.querySelector('.list-card-title').innerText
}

// Alert gives us an easy way to copy and paste this text out.
alert(trelloBoardAsText())