toolbox/cron-parser.html at main · 100millionusd/toolbox · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Cron Expression Parser — Human-Readable Schedule Description</title>
  <meta name="description" content="Parse and generate cron expressions with a human-readable description and next run times. Free online cron expression parser and builder.">
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<script type="application/ld+json">{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"📚 Common Cron Presets


      🧠 Cron Cheat Sheet

        * any value
        , value list separator (1,3,5)
        - range of values (1-5)
        / step values (*/15 = every 15)
        0-59 minute
        0-23 hour
        1-31 day of month
        1-12 month
        0-6 day of week (0 = Sunday)


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          <div class="tool-card" style="max-width:720px;">
      <h2 style="font-size:1rem;margin-bottom:0.75rem;">📖 About Cron Expression Parser</h2>
      <p style="font-size:0.85rem;line-height:1.7;color:var(--text-muted);margin-bottom:0.75rem;">Cron Expression Parser is a free, browser-based tool built for developers, designers, and everyday users. Parse and generate cron expressions with a human-readable description and next run times. Free online cron expression parser and builder. This tool processes everything locally using JavaScript — no data is uploaded to any server, no account is required, and there are no usage limits. Whether you’re working on a quick project or handling sensitive data, your privacy is fully protected. Bookmark this page and use it anytime — it works on desktop, tablet, and mobile devices.</p>
      <h3 style="font-size:0.9rem;margin-bottom:0.5rem;">How to Use</h3>
      <ol style="font-size:0.85rem;color:var(--text-muted);line-height:1.7;padding-left:1.2rem;">
        <li><strong>Enter your data</strong> — Type, paste, or upload your input in the fields above.</li>
        <li><strong>Configure options</strong> — Adjust any settings or parameters to match your requirements.</li>
        <li><strong>Get instant results</strong> — Output updates automatically in real-time as you type.</li>
        <li><strong>Copy or download</strong> — Use the Copy button to grab results, or download if available.</li>
      </ol>
    </div>
    Frequently Asked Questions
      What is a cron expression?","acceptedAnswer":{"@type":"Answer","text":"A cron expression is a string of five fields representing a schedule: minute, hour, day of month, month, and day of week. It's used in Unix/Linux systems, CI/CD pipelines, and cloud services to schedule recurring tasks."}},{"@type":"Question","name":"What does */5 mean?","acceptedAnswer":{"@type":"Answer","text":"The /5 means 'every 5th.' So */5 in the minute field means 'every 5 minutes.' In the hour field, */2 would mean 'every 2 hours.'"}}]}</script>
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      <h1>Cron Expression Parser</h1>
      <p>Parse cron expressions into human-readable descriptions with next scheduled run times.</p>
    </div>
    <div class="tool-card">
      <label>Cron Expression</label>
      <input type="text" id="cronInput" class="mono" value="*/15 9-17 * * 1-5" oninput="parseCron()" style="font-size: 1.2rem; text-align: center; letter-spacing: 0.1em;">
      <div style="display: flex; justify-content: space-around; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0.5rem;">
        <span>Minute</span><span>Hour</span><span>Day</span><span>Month</span><span>Weekday</span>
      </div>
      <div id="description" style="text-align: center; padding: 1.5rem; font-size: 1.1rem; color: var(--accent-hover); margin-top: 1rem; background: var(--accent-glow); border-radius: var(--radius-sm);"></div>
      <div id="nextRuns" class="mt-3"></div>
    </div>
    <div class="tool-card">
      <h3 style="font-size: 0.95rem; margin-bottom: 1rem;">📚 Common Cron Presets</h3>
      <div style="display: flex; flex-wrap: wrap; gap: 0.5rem;" id="presets"></div>
    </div>
    <div class="tool-card">
      <h3 style="font-size: 0.95rem; margin-bottom: 1rem;">🧠 Cron Cheat Sheet</h3>
      <div style="font-family: monospace; font-size: 0.82rem; line-height: 2; color: var(--text-secondary);">
        <div><span class="text-muted" style="display: inline-block; width: 60px;">*</span> any value</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">,</span> value list separator (1,3,5)</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">-</span> range of values (1-5)</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">/</span> step values (*/15 = every 15)</div>
        <div style="margin-top: 0.5rem;"><span class="text-muted" style="display: inline-block; width: 60px;">0-59</span> minute</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">0-23</span> hour</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">1-31</span> day of month</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">1-12</span> month</div>
        <div><span class="text-muted" style="display: inline-block; width: 60px;">0-6</span> day of week (0 = Sunday)</div>
      </div>
    </div>
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    <div class="faq-section">
      <h2>Frequently Asked Questions</h2>
      <div class="faq-item"><h3>What is a cron expression?</h3><p>A cron expression is a string of five fields representing a schedule: minute, hour, day of month, month, and day of week. It's used in Unix/Linux systems, CI/CD pipelines, and cloud services to schedule recurring tasks.</p></div>
      <div class="faq-item"><h3>What does */5 mean?</h3><p>The /5 means "every 5th." So */5 in the minute field means "every 5 minutes." In the hour field, */2 would mean "every 2 hours."</p></div>
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  </div>
  <script>
    const presets = [
      ['Every minute', '* * * * *'], ['Every 5 min', '*/5 * * * *'], ['Every 15 min', '*/15 * * * *'],
      ['Every hour', '0 * * * *'], ['Every 6 hours', '0 */6 * * *'], ['Daily midnight', '0 0 * * *'],
      ['Daily at 9 AM', '0 9 * * *'], ['Weekdays 9 AM', '0 9 * * 1-5'], ['Mon-Fri 9-5 hourly', '0 9-17 * * 1-5'],
      ['Weekly Sunday', '0 0 * * 0'], ['Monthly 1st', '0 0 1 * *'], ['Yearly Jan 1', '0 0 1 1 *'],
    ];

    document.getElementById('presets').innerHTML = presets.map(([label, expr]) =>
      `<button class="btn btn-secondary" style="font-size: 0.78rem;" onclick="document.getElementById('cronInput').value='${expr}'; parseCron();">${label}<br><span class="text-muted" style="font-size: 0.7rem;">${expr}</span></button>`
    ).join('');

    const dayNames = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
    const monthNames = ['','January','February','March','April','May','June','July','August','September','October','November','December'];

    function describePart(part, type) {
      if (part === '*') return `every ${type}`;
      if (part.includes('/')) { const [base, step] = part.split('/'); return `every ${step} ${type}s` + (base !== '*' ? ` starting at ${base}` : ''); }
      if (part.includes('-')) { const [a,b] = part.split('-'); return type === 'weekday' ? `${dayNames[a]} through ${dayNames[b]}` : `${a} through ${b}`; }
      if (part.includes(',')) return part.split(',').map(v => type === 'weekday' ? dayNames[v] : v).join(', ');
      return type === 'weekday' ? dayNames[part] : part;
    }

    function parseCron() {
      const input = document.getElementById('cronInput').value.trim();
      const parts = input.split(/\s+/);
      if (parts.length !== 5) { document.getElementById('description').textContent = 'Invalid cron expression (need 5 fields)'; return; }
      const [min, hour, dom, month, dow] = parts;

      let desc = 'Runs ';
      if (min === '*' && hour === '*') desc += 'every minute';
      else if (min.includes('/')) desc += describePart(min, 'minute');
      else if (min === '0' && hour === '*') desc += 'every hour at minute 0';
      else if (min === '0' && hour.includes('/')) desc += describePart(hour, 'hour');
      else if (hour !== '*') desc += `at ${hour.padStart(2,'0')}:${min.padStart(2,'0')}`;
      else desc += `at minute ${min}`;

      if (dom !== '*') desc += `, on day ${dom} of the month`;
      if (month !== '*') desc += `, in ${describePart(month, 'month')}`;
      if (dow !== '*') desc += `, on ${describePart(dow, 'weekday')}`;

      document.getElementById('description').textContent = desc;

      // Calculate next runs
      const runs = getNextRuns(parts, 10);
      document.getElementById('nextRuns').innerHTML = '<h3 style="font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.5rem;">Next 10 Runs</h3>' +
        runs.map((d,i) => `<div style="padding: 0.4rem 0; border-bottom: 1px solid var(--border); font-size: 0.85rem; display: flex; justify-content: space-between;">
          <span class="text-muted">#${i+1}</span>
          <span class="text-mono">${d.toLocaleString()}</span>
          <span class="text-muted">${getRelative(d)}</span>
        </div>`).join('');
    }

    function matchesCron(date, parts) {
      const [min,hour,dom,month,dow] = parts;
      return fieldMatches(date.getMinutes(), min) && fieldMatches(date.getHours(), hour) &&
             fieldMatches(date.getDate(), dom) && fieldMatches(date.getMonth()+1, month) &&
             fieldMatches(date.getDay(), dow);
    }

    function fieldMatches(value, field) {
      if (field === '*') return true;
      return field.split(',').some(part => {
        if (part.includes('/')) { const [base, step] = part.split('/'); const b = base === '*' ? 0 : parseInt(base); return (value - b) % parseInt(step) === 0 && value >= b; }
        if (part.includes('-')) { const [a,b] = part.split('-').map(Number); return value >= a && value <= b; }
        return value === parseInt(part);
      });
    }

    function getNextRuns(parts, count) {
      const runs = [];
      const d = new Date();
      d.setSeconds(0, 0);
      d.setMinutes(d.getMinutes() + 1);
      let safety = 0;
      while (runs.length < count && safety < 525600) {
        if (matchesCron(d, parts)) runs.push(new Date(d));
        d.setMinutes(d.getMinutes() + 1);
        safety++;
      }
      return runs;
    }

    function getRelative(d) {
      const diff = (d - new Date()) / 1000;
      if (diff < 60) return 'in ' + Math.round(diff) + 's';
      if (diff < 3600) return 'in ' + Math.round(diff/60) + 'min';
      if (diff < 86400) return 'in ' + Math.round(diff/3600) + 'h';
      return 'in ' + Math.round(diff/86400) + 'd';
    }

    parseCron();
  </script>
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