Apply pre-defined rules to automatically categorise your expenses on MoneyForward

moneyforward-automatic-expenses-categoriser.js

(() => {
  const rules = [
    {
      content: /kindle/i,
      note: /^Amazon\.co\.jp$/,
      kind: '本',
    },
  ];

  async function find(selector, parent = document) {
    while(true) {
      const el = parent.querySelector(selector);

      if (el) {
        return el;
      }

      await new Promise((r) => window.requestAnimationFrame(r));
    }
  }

  async function text(selector, parent = document) {
    const el = parent.querySelector(selector);
    return el?.textContent.trim() ?? '';
  }

  function click(element) {
    const ev = new MouseEvent('click', { bubbles: true, cancelable: true, view: window });
    element.dispatchEvent(ev);
  }

  async function main() {
    const list = document.querySelectorAll('.transaction_list');

    for(const item of list) {
      const content = await text('.content', item);
      const note = await text('.note', item);
      const rule = rules.find((rule) => rule.content.test(content) && rule.note.test(note));

      if (!rule) {
        continue;
      }

      const currentKind = await text('.mctg', item);

      if (currentKind === rule.kind) {
        continue;
      }

      const dropdownToggle = await find('.dropdown-toggle', item);
      click(dropdownToggle);

      const dropdown = await find('.main_menu', item);
      const dropdownItem = Array.from(dropdown.querySelectorAll('.m_c_name')).find((el) => el.textContent === rule.kind);

      if (!dropdownItem) {
        console.error(`${rule.kind} is not found in`, dropdown);
        continue;
      }

      // Prevent the dropdown from being removed by MoneyForward's code
      dropdown.classList.remove('main_menu');
      dropdown.classList.add('main_menu_wip');

      click(dropdownItem);
      console.log(`${content} (${note}) -> ${rule.kind}`);
    }

    Array.from(document.querySelectorAll('.main_menu_wip')).forEach((el) => el.remove());
  }

  main().then(() => console.log('Finished!')).catch(console.error);
})();