Frontend-Widgets/fake-data-generator.html at main · monapdx/Frontend-Widgets · 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">
  <title>Fake data generator</title>
<link rel="stylesheet" href="styles-vanilla.css" />
</head>
<body>

<div class="card">
            <h2>Fake Data Generator</h2>
            <p class="subtle">Define a schema one field per line using the format <span class="pill">name:type</span>. Then generate mock rows as JSON, CSV, or SQL inserts.</p>
            <div class="field">
              <label for="schema-input">Schema</label>
              <textarea id="schema-input" placeholder="Example:
id:number
name:fullName
email:email
created_at:date
is_active:boolean"></textarea>
            </div>
            <div class="row-3">
              <div class="field">
                <label for="row-count">Rows</label>
                <input id="row-count" type="number" min="1" max="500" value="10" />
              </div>
              <div class="field">
                <label for="data-format">Output format</label>
                <select id="data-format">
                  <option value="json" selected>JSON</option>
                  <option value="csv">CSV</option>
                  <option value="sql">SQL inserts</option>
                </select>
              </div>
              <div class="field">
                <label for="table-name">Table name</label>
                <input id="table-name" type="text" placeholder="users" value="users" />
              </div>
            </div>
            <div class="muted-box">
              Supported types: number, integer, fullName, firstName, lastName, email, phone, company, city, country, username, boolean, uuid, slug, sentence, paragraph, date, timestamp, price.
            </div>
            <div class="actions">
              <button class="primary" id="generate-data-btn">Generate fake data</button>
              <button class="secondary" id="copy-data-btn">Copy output</button>
              <button class="secondary" id="download-data-btn">Download file</button>
              <button class="secondary" id="sample-data-btn">Load sample</button>
            </div>
          </div>
        </div>
        <div class="stack">
          <div class="card">
            <h3>Output</h3>
            <div id="data-output" class="output">Generated data will appear here.</div>
          </div>

		  <script>
    // Fake data generator
    const fakeData = {
      firstNames: ['Mona', 'Ashly', 'Riley', 'Jordan', 'Avery', 'Taylor', 'Morgan', 'Dakota', 'Robin', 'Sydney'],
      lastNames: ['Lorenzana', 'Reed', 'Williams', 'Nguyen', 'Garcia', 'Bennett', 'Miller', 'Santos', 'Chen', 'Brooks'],
      cities: ['Portland', 'Seattle', 'Austin', 'Chicago', 'Miami', 'Denver', 'Phoenix', 'Boston', 'Atlanta', 'Oakland'],
      countries: ['United States', 'Canada', 'Mexico', 'France', 'Japan', 'Germany', 'Brazil', 'Spain', 'Australia', 'Netherlands'],
      companies: ['Northline Studio', 'Pixel Harbor', 'Signal Forge', 'Quiet Orbit', 'Velvet Grid', 'Paper Lantern', 'Open Meadow', 'Bright Relay'],
      words: ['aurora', 'signal', 'paper', 'frontend', 'widget', 'archive', 'garden', 'ember', 'delta', 'violet', 'harbor', 'lumen']
    };

    function rand(arr) { return arr[Math.floor(Math.random() * arr.length)]; }
    function randInt(min, max) { return Math.floor(Math.random() * (max - min + 1)) + min; }
    function randBool() { return Math.random() > 0.5; }
    function randDigits(n) { return Array.from({ length: n }, () => randInt(0, 9)).join(''); }
    function randWord(count = 1) { return Array.from({ length: count }, () => rand(fakeData.words)).join(' '); }
    function randSentence() {
      const len = randInt(5, 11);
      const sentence = Array.from({ length: len }, () => rand(fakeData.words)).join(' ');
      return titleCase(sentence) + '.';
    }
    function randParagraph() {
      return Array.from({ length: randInt(2, 4) }, () => randSentence()).join(' ');
    }
    function makeUUID() {
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
        const r = Math.random() * 16 | 0;
        const v = c === 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
      });
    }

    function generateFieldValue(type, index) {
      const first = rand(fakeData.firstNames);
      const last = rand(fakeData.lastNames);
      switch ((type || '').trim()) {
        case 'number':
        case 'integer': return randInt(1, 9999);
        case 'fullname':
        case 'fullName': return `${first} ${last}`;
        case 'firstname':
        case 'firstName': return first;
        case 'lastname':
        case 'lastName': return last;
        case 'email': return `${first.toLowerCase()}.${last.toLowerCase()}${randInt(1, 99)}@example.com`;
        case 'phone': return `(${randInt(200, 989)}) ${randInt(100, 999)}-${randInt(1000, 9999)}`;
        case 'company': return rand(fakeData.companies);
        case 'city': return rand(fakeData.cities);
        case 'country': return rand(fakeData.countries);
        case 'username': return `${first.toLowerCase()}_${last.toLowerCase()}${randInt(10, 999)}`;
        case 'boolean': return randBool();
        case 'uuid': return makeUUID();
        case 'slug': return slugify(randWord(randInt(2, 4)) + ' ' + index);
        case 'sentence': return randSentence();
        case 'paragraph': return randParagraph();
        case 'date': {
          const date = new Date(Date.now() - randInt(0, 365) * 86400000);
          return date.toISOString().slice(0, 10);
        }
        case 'timestamp': {
          const date = new Date(Date.now() - randInt(0, 365) * 86400000 - randInt(0, 86400000));
          return date.toISOString();
        }
        case 'price': return (Math.random() * 300 + 5).toFixed(2);
        default: return randSentence();
      }
    }

    function parseSchema() {
      const raw = $('#schema-input').value.trim();
      const lines = raw.split(/\n+/).map((line) => line.trim()).filter(Boolean);
      const schema = lines.map((line) => {
        const [name, type] = line.split(':').map((part) => part.trim());
        return { name, type };
      }).filter((item) => item.name && item.type);

      const tbody = $('#schema-table tbody');
      if (!schema.length) {
        tbody.innerHTML = '<tr><td colspan="2" class="small">No valid schema parsed yet.</td></tr>';
      } else {
        tbody.innerHTML = schema.map((field) => `<tr><td>${field.name}</td><td>${field.type}</td></tr>`).join('');
      }
      return schema;
    }

    $('#schema-input').addEventListener('input', parseSchema);

    function generateFakeData() {
      const schema = parseSchema();
      const count = Math.max(1, Math.min(500, parseInt($('#row-count').value || '10', 10)));
      const format = $('#data-format').value;
      const tableName = ($('#table-name').value || 'users').trim();

      if (!schema.length) {
        $('#data-output').textContent = 'Please define a valid schema first.';
        return;
      }

      const rows = Array.from({ length: count }, (_, index) => {
        const obj = {};
        schema.forEach((field) => {
          obj[field.name] = generateFieldValue(field.type, index + 1);
        });
        return obj;
      });

      let output = '';
      if (format === 'json') {
        output = JSON.stringify(rows, null, 2);
      } else if (format === 'csv') {
        const headers = schema.map((f) => f.name);
        const csvLines = [headers.join(',')];
        rows.forEach((row) => {
          csvLines.push(headers.map((key) => {
            const value = row[key];
            const str = String(value).replace(/"/g, '""');
            return /[",\n]/.test(str) ? `"${str}"` : str;
          }).join(','));
        });
        output = csvLines.join('\n');
      } else if (format === 'sql') {
        const cols = schema.map((f) => f.name).join(', ');
        const statements = rows.map((row) => {
          const values = schema.map((field) => {
            const value = row[field.name];
            if (typeof value === 'boolean') return value ? 'TRUE' : 'FALSE';
            if (typeof value === 'number') return String(value);
            return `'${String(value).replace(/'/g, "''")}'`;
          }).join(', ');
          return `INSERT INTO ${tableName} (${cols}) VALUES (${values});`;
        });
        output = statements.join('\n');
      }

      $('#data-output').textContent = output;
    }

    function downloadFakeData() {
      const output = $('#data-output').textContent;
      if (!output || output.includes('Generated data will appear here') || output.includes('Please define')) {
        alert('Generate some data first.');
        return;
      }
      const format = $('#data-format').value;
      const ext = format === 'sql' ? 'sql' : format;
      const blob = new Blob([output], { type: 'text/plain;charset=utf-8' });
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = `fake-data.${ext}`;
      a.click();
      URL.revokeObjectURL(url);
    }

    $('#generate-data-btn').addEventListener('click', generateFakeData);
    $('#copy-data-btn').addEventListener('click', () => copyText($('#data-output').textContent));
    $('#download-data-btn').addEventListener('click', downloadFakeData);
    $('#sample-data-btn').addEventListener('click', () => {
      $('#schema-input').value = 'id:number\nname:fullName\nemail:email\ncity:city\ncompany:company\ncreated_at:timestamp\nis_active:boolean\nprice:price';
      $('#row-count').value = '10';
      $('#data-format').value = 'json';
      $('#table-name').value = 'users';
      parseSchema();
      generateFakeData();
    });

	</script>

</body>
</html>