Convert to html table to markdown table

gistfile1.js

function tableToMarkdown(tableEl) {
  if (!tableEl || tableEl.tagName !== 'TABLE') {
    throw new Error('Pass a <table> element');
  }

  const escapeCell = (t) =>
    String(t ?? '')
      .replace(/\|/g, '\\|')      // escape pipes
      .replace(/\r?\n+/g, ' ')    // collapse newlines
      .trim();

  // 1) Find header cells
  let headerCells = [];
  const thead = tableEl.querySelector('thead');
  if (thead) {
    const headRow = thead.querySelector('tr');
    if (headRow) headerCells = Array.from(headRow.querySelectorAll('th,td'));
  }
  // Fallback: first row in the table (before using tbody rows)
  if (headerCells.length === 0) {
    const firstRow = tableEl.querySelector('tr');
    if (firstRow) headerCells = Array.from(firstRow.querySelectorAll('th,td'));
  }

  const headers = headerCells.map((c) => escapeCell(c.textContent));
  const colCount = headers.length || Math.max(
    0,
    ...Array.from(tableEl.querySelectorAll('tr')).map(
      (tr) => tr.querySelectorAll('th,td').length
    )
  );

  // If still no headers, synthesize generic ones
  const finalHeaders = headers.length
    ? headers
    : Array.from({ length: colCount }, (_, i) => `Col ${i + 1}`);

  // 2) Collect body rows (skip the header row if we used it)
  const allRows = Array.from(tableEl.querySelectorAll('tr'));
  const headerRowEl = headerCells.length ? headerCells[0].closest('tr') : null;

  const bodyRows = allRows.filter((tr) => tr !== headerRowEl);

  const rows = bodyRows.map((tr) => {
    const cells = Array.from(tr.querySelectorAll('th,td')).map((c) =>
      escapeCell(c.textContent)
    );
    // Normalize width to colCount
    if (cells.length < colCount) {
      while (cells.length < colCount) cells.push('');
    } else if (cells.length > colCount) {
      cells.length = colCount;
    }
    return cells;
  });

  // 3) Build Markdown
  let out = '';
  out += `| ${finalHeaders.join(' | ')} |\n`;
  out += `| ${finalHeaders.map(() => '---').join(' | ')} |\n`;
  for (const r of rows) {
    out += `| ${r.join(' | ')} |\n`;
  }
  return out;
}

// Usage:
var el = document.querySelector('#table1');
var md = tableToMarkdown(el);
console.log(md);