json2msgpack/index.html at main · graphif/json2msgpack · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>JSON to MessagePack 在线转换器 | 免费纯前端工具</title>
  <meta name="description" content="免费在线将 JSON 转换为 MessagePack 二进制格式。纯前端实现，无需上传数据，支持中文等 UTF-8 字符，输出结果与 Python msgpack 库完全一致。">
  <meta name="keywords" content="JSON to MessagePack, JSON转MessagePack, msgpack converter, msgpack在线转换, JSON encoder, binary format, msgpack工具">
  <meta name="author" content="graphif">
  <link rel="canonical" href="https://graphif.github.io/json2msgpack/">
  <!-- Open Graph -->
  <meta property="og:type" content="website">
  <meta property="og:url" content="https://graphif.github.io/json2msgpack/">
  <meta property="og:title" content="JSON to MessagePack 在线转换器">
  <meta property="og:description" content="免费在线将 JSON 转换为 MessagePack 二进制格式。纯前端实现，数据不离开浏览器，支持 UTF-8 字符串。">
  <!-- Twitter Card -->
  <meta name="twitter:card" content="summary">
  <meta name="twitter:title" content="JSON to MessagePack 在线转换器">
  <meta name="twitter:description" content="免费在线将 JSON 转换为 MessagePack 二进制格式。纯前端实现，数据不离开浏览器，支持 UTF-8 字符串。">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background: #1a1a2e;
      color: #e0e0e0;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 32px 16px;
    }
    h1 {
      font-size: 1.6rem;
      margin-bottom: 8px;
      color: #a0c4ff;
      letter-spacing: 1px;
    }
    .subtitle {
      font-size: 0.85rem;
      color: #888;
      margin-bottom: 32px;
    }
    .container {
      width: 100%;
      max-width: 820px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    label {
      font-size: 0.9rem;
      color: #aaa;
      margin-bottom: 6px;
      display: block;
    }
    textarea {
      width: 100%;
      height: 220px;
      background: #0f0f1a;
      border: 1px solid #333;
      border-radius: 8px;
      color: #c9f0a0;
      font-family: "Fira Mono", "Consolas", monospace;
      font-size: 0.92rem;
      padding: 14px;
      resize: vertical;
      outline: none;
      transition: border-color 0.2s;
    }
    textarea:focus { border-color: #a0c4ff; }
    .btn-row {
      display: flex;
      gap: 12px;
      align-items: center;
      flex-wrap: wrap;
    }
    button {
      padding: 10px 28px;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-size: 0.95rem;
      font-weight: 600;
      transition: background 0.2s, transform 0.1s;
    }
    button:active { transform: scale(0.97); }
    #btnConvert {
      background: #4a90d9;
      color: #fff;
    }
    #btnConvert:hover { background: #5aa3f0; }
    #btnDownload {
      background: #2ecc71;
      color: #fff;
      display: none;
    }
    #btnDownload:hover { background: #3de082; }
    #btnClear {
      background: #444;
      color: #ccc;
    }
    #btnClear:hover { background: #555; }
    #status {
      font-size: 0.88rem;
      padding: 4px 0;
    }
    .ok  { color: #2ecc71; }
    .err { color: #e74c3c; }
    .output-box {
      background: #0f0f1a;
      border: 1px solid #333;
      border-radius: 8px;
      padding: 14px;
      font-family: "Fira Mono", "Consolas", monospace;
      font-size: 0.82rem;
      color: #f0c040;
      word-break: break-all;
      min-height: 60px;
      white-space: pre-wrap;
    }
    .info-row {
      display: flex;
      gap: 24px;
      font-size: 0.83rem;
      color: #888;
      flex-wrap: wrap;
    }
    .info-row span b { color: #ccc; }
    details summary {
      cursor: pointer;
      color: #a0c4ff;
      font-size: 0.85rem;
      margin-bottom: 8px;
      user-select: none;
    }
    .hex-grid {
      font-family: "Fira Mono", "Consolas", monospace;
      font-size: 0.78rem;
      color: #aaa;
      line-height: 1.7;
    }
  </style>
</head>
<body>
  <h1>JSON → MessagePack 在线转换器</h1>
  <p class="subtitle">纯前端实现，无需任何外部库 · 完整支持 UTF-8 字符串 · 数据不离开浏览器</p>

  <div class="container">
    <!-- 输入 -->
    <div>
      <label>输入 JSON</label>
      <textarea id="jsonInput" placeholder='{"version": "2.0.0", "extension": {...}}'>{
  "version": "2.0.0",
  "extension": {
    "id": "svg-test",
    "name": "svg动画",
    "description": "测试动画",
    "version": "1.0.0",
    "author": "阿岳",
    "icon": "logo-animated.svg"
  }
}</textarea>
    </div>

    <!-- 按钮行 -->
    <div class="btn-row">
      <button id="btnConvert" onclick="doConvert()">转换为 MessagePack</button>
      <button id="btnDownload" onclick="doDownload()">⬇ 下载 .msgpack</button>
      <button id="btnClear" onclick="doClear()">清空</button>
      <span id="status"></span>
    </div>

    <!-- 输出：统计信息 -->
    <div class="info-row" id="infoRow" style="display:none">
      <span>JSON 大小：<b id="infoJsonSize">-</b></span>
      <span>MessagePack 大小：<b id="infoMsgSize">-</b></span>
      <span>压缩率：<b id="infoRatio">-</b></span>
    </div>

    <!-- 输出：Hex -->
    <div id="outputSection" style="display:none">
      <label>输出 Hex（MessagePack 字节）</label>
      <div class="output-box" id="hexOutput"></div>

      <details style="margin-top:12px">
        <summary>▶ 查看格式化 Hex 视图（每行 16 字节）</summary>
        <div class="hex-grid" id="hexGrid"></div>
      </details>
    </div>
  </div>

  <footer style="margin-top:48px;padding:24px 16px;text-align:center;font-size:0.78rem;color:#555;max-width:820px;width:100%;border-top:1px solid #222">
    <p>本工具在浏览器本地完成转换，<strong style="color:#777">数据不会上传到任何服务器</strong>。</p>
    <p style="margin-top:6px">
      支持所有 JSON 数据类型，字符串采用 UTF-8 编码，与
      <code style="color:#aaa">msgpack.packb(data, use_bin_type=True)</code> 输出字节一致。
      &nbsp;·&nbsp;
      <a href="https://github.com/graphif/json2msgpack" style="color:#4a90d9;text-decoration:none" target="_blank" rel="noopener">GitHub</a>
    </p>
  </footer>

  <script>
  /* ================================================================
     纯手写 MessagePack 编码器
     规范参考：https://github.com/msgpack/msgpack/blob/master/spec.md

     与 Python msgpack.packb(data, use_bin_type=True) 行为一致：
       - str  → fixstr / str8 / str16 / str32（UTF-8 字节）
       - bytes → bin8 / bin16 / bin32（本页面不处理 bytes 类型）
       - int  → fixint / int8 / int16 / int32 / int64 / uint*
       - float → float64
       - bool  → true / false
       - null  → nil
       - Array → fixarray / array16 / array32
       - Object→ fixmap / map16 / map32
     ================================================================ */

  /**
   * 将 JavaScript 值编码为 MessagePack，返回 Uint8Array
   */
  function encodeMsgpack(value) {
    const chunks = [];
    encodeValue(value, chunks);
    // 合并所有 chunk
    const total = chunks.reduce((s, c) => s + c.length, 0);
    const out = new Uint8Array(total);
    let offset = 0;
    for (const c of chunks) {
      out.set(c, offset);
      offset += c.length;
    }
    return out;
  }

  function encodeValue(val, chunks) {
    if (val === null || val === undefined) {
      chunks.push(new Uint8Array([0xc0])); // nil
    } else if (typeof val === 'boolean') {
      chunks.push(new Uint8Array([val ? 0xc3 : 0xc2]));
    } else if (typeof val === 'number') {
      encodeNumber(val, chunks);
    } else if (typeof val === 'string') {
      encodeString(val, chunks);
    } else if (Array.isArray(val)) {
      encodeArray(val, chunks);
    } else if (typeof val === 'object') {
      encodeMap(val, chunks);
    } else {
      throw new Error('不支持的类型: ' + typeof val);
    }
  }

  /* ---------- 数字 ---------- */
  function encodeNumber(n, chunks) {
    if (Number.isInteger(n)) {
      encodeInt(n, chunks);
    } else {
      // float64
      const buf = new ArrayBuffer(9);
      const view = new DataView(buf);
      view.setUint8(0, 0xcb);
      view.setFloat64(1, n, false); // big-endian
      chunks.push(new Uint8Array(buf));
    }
  }

  function encodeInt(n, chunks) {
    if (n >= 0) {
      if (n <= 0x7f) {
        // positive fixint
        chunks.push(new Uint8Array([n]));
      } else if (n <= 0xff) {
        chunks.push(new Uint8Array([0xcc, n])); // uint8
      } else if (n <= 0xffff) {
        chunks.push(new Uint8Array([0xcd, n >> 8, n & 0xff])); // uint16
      } else if (n <= 0xffffffff) {
        chunks.push(new Uint8Array([0xce,
          (n >>> 24) & 0xff, (n >>> 16) & 0xff,
          (n >>> 8) & 0xff, n & 0xff])); // uint32
      } else {
        // uint64 — JS 整数精度有限，尽力而为
        const hi = Math.floor(n / 0x100000000);
        const lo = n >>> 0;
        chunks.push(new Uint8Array([0xcf,
          (hi >>> 24) & 0xff, (hi >>> 16) & 0xff,
          (hi >>> 8) & 0xff, hi & 0xff,
          (lo >>> 24) & 0xff, (lo >>> 16) & 0xff,
          (lo >>> 8) & 0xff, lo & 0xff]));
      }
    } else {
      if (n >= -32) {
        // negative fixint
        chunks.push(new Uint8Array([n & 0xff]));
      } else if (n >= -128) {
        chunks.push(new Uint8Array([0xd0, n & 0xff])); // int8
      } else if (n >= -32768) {
        chunks.push(new Uint8Array([0xd1, (n >> 8) & 0xff, n & 0xff])); // int16
      } else if (n >= -2147483648) {
        chunks.push(new Uint8Array([0xd2,
          (n >> 24) & 0xff, (n >> 16) & 0xff,
          (n >> 8) & 0xff, n & 0xff])); // int32
      } else {
        // int64
        const hi = Math.floor(n / 0x100000000);
        const lo = n >>> 0;
        chunks.push(new Uint8Array([0xd3,
          (hi >>> 24) & 0xff, (hi >>> 16) & 0xff,
          (hi >>> 8) & 0xff, hi & 0xff,
          (lo >>> 24) & 0xff, (lo >>> 16) & 0xff,
          (lo >>> 8) & 0xff, lo & 0xff]));
      }
    }
  }

  /* ---------- 字符串（UTF-8 编码，关键！） ---------- */
  function encodeString(str, chunks) {
    // 先用 TextEncoder 把字符串转成 UTF-8 字节
    const utf8 = new TextEncoder().encode(str);
    const len = utf8.length;

    let header;
    if (len <= 31) {
      // fixstr: 101xxxxx
      header = new Uint8Array([0xa0 | len]);
    } else if (len <= 0xff) {
      // str8
      header = new Uint8Array([0xd9, len]);
    } else if (len <= 0xffff) {
      // str16
      header = new Uint8Array([0xda, len >> 8, len & 0xff]);
    } else {
      // str32
      header = new Uint8Array([0xdb,
        (len >>> 24) & 0xff, (len >>> 16) & 0xff,
        (len >>> 8) & 0xff, len & 0xff]);
    }
    chunks.push(header);
    chunks.push(utf8);
  }

  /* ---------- 数组 ---------- */
  function encodeArray(arr, chunks) {
    const len = arr.length;
    if (len <= 15) {
      chunks.push(new Uint8Array([0x90 | len])); // fixarray
    } else if (len <= 0xffff) {
      chunks.push(new Uint8Array([0xdc, len >> 8, len & 0xff])); // array16
    } else {
      chunks.push(new Uint8Array([0xdd,
        (len >>> 24) & 0xff, (len >>> 16) & 0xff,
        (len >>> 8) & 0xff, len & 0xff])); // array32
    }
    for (const item of arr) encodeValue(item, chunks);
  }

  /* ---------- Map（Object） ---------- */
  function encodeMap(obj, chunks) {
    const keys = Object.keys(obj);
    const len = keys.length;
    if (len <= 15) {
      chunks.push(new Uint8Array([0x80 | len])); // fixmap
    } else if (len <= 0xffff) {
      chunks.push(new Uint8Array([0xde, len >> 8, len & 0xff])); // map16
    } else {
      chunks.push(new Uint8Array([0xdf,
        (len >>> 24) & 0xff, (len >>> 16) & 0xff,
        (len >>> 8) & 0xff, len & 0xff])); // map32
    }
    for (const k of keys) {
      encodeString(k, chunks);
      encodeValue(obj[k], chunks);
    }
  }

  /* ================================================================
     UI 逻辑
     ================================================================ */
  let lastBytes = null;

  function doConvert() {
    const input = document.getElementById('jsonInput').value.trim();
    const status = document.getElementById('status');
    const hexOutput = document.getElementById('hexOutput');
    const hexGrid = document.getElementById('hexGrid');
    const outputSection = document.getElementById('outputSection');
    const infoRow = document.getElementById('infoRow');
    const btnDownload = document.getElementById('btnDownload');

    if (!input) {
      setStatus('请先输入 JSON 内容', 'err');
      return;
    }

    let data;
    try {
      data = JSON.parse(input);
    } catch (e) {
      setStatus('JSON 解析失败：' + e.message, 'err');
      outputSection.style.display = 'none';
      infoRow.style.display = 'none';
      btnDownload.style.display = 'none';
      return;
    }

    try {
      const bytes = encodeMsgpack(data);
      lastBytes = bytes;

      // hex string
      const hex = Array.from(bytes).map(b => b.toString(16).padStart(2, '0')).join(' ');
      hexOutput.textContent = hex;

      // formatted hex grid
      hexGrid.textContent = formatHexGrid(bytes);

      // info
      const jsonSize = new TextEncoder().encode(input).length;
      const msgSize = bytes.length;
      document.getElementById('infoJsonSize').textContent = jsonSize + ' B';
      document.getElementById('infoMsgSize').textContent = msgSize + ' B';
      const ratio = ((1 - msgSize / jsonSize) * 100).toFixed(1);
      document.getElementById('infoRatio').textContent =
        (ratio > 0 ? '-' : '+') + Math.abs(ratio) + '%';

      outputSection.style.display = 'block';
      infoRow.style.display = 'flex';
      btnDownload.style.display = 'inline-block';
      setStatus('转换成功！共 ' + msgSize + ' 字节', 'ok');
    } catch (e) {
      setStatus('编码失败：' + e.message, 'err');
      outputSection.style.display = 'none';
      infoRow.style.display = 'none';
      btnDownload.style.display = 'none';
    }
  }

  function formatHexGrid(bytes) {
    const lines = [];
    for (let i = 0; i < bytes.length; i += 16) {
      const slice = bytes.slice(i, i + 16);
      const addr = i.toString(16).padStart(4, '0').toUpperCase();
      const hex = Array.from(slice)
        .map(b => b.toString(16).padStart(2, '0').toUpperCase())
        .join(' ')
        .padEnd(16 * 3 - 1, ' ');
      const ascii = Array.from(slice)
        .map(b => (b >= 0x20 && b <= 0x7e) ? String.fromCharCode(b) : '·')
        .join('');
      lines.push(addr + '  ' + hex + '  |' + ascii + '|');
    }
    return lines.join('\n');
  }

  function doDownload() {
    if (!lastBytes) return;
    const blob = new Blob([lastBytes], { type: 'application/octet-stream' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'metadata.msgpack';
    a.click();
    URL.revokeObjectURL(url);
  }

  function doClear() {
    document.getElementById('jsonInput').value = '';
    document.getElementById('outputSection').style.display = 'none';
    document.getElementById('infoRow').style.display = 'none';
    document.getElementById('btnDownload').style.display = 'none';
    document.getElementById('status').textContent = '';
    lastBytes = null;
  }

  function setStatus(msg, cls) {
    const el = document.getElementById('status');
    el.textContent = msg;
    el.className = cls;
  }

  // 支持 Ctrl+Enter 快速转换
  document.addEventListener('DOMContentLoaded', () => {
    document.getElementById('jsonInput').addEventListener('keydown', e => {
      if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') doConvert();
    });
  });
  </script>
</body>
</html>