Does escaping prevent SQL injection?

String escaping reduces risk but is not a substitute for parameterized queries in production code.

What is \uXXXX encoding?

Unicode escape sequences represent characters by their code point —e.g. \u0041 = "A".

What does String Escape / Unescape Online —JSON, JS & HTML Escaping do?

String Escape / Unescape Online —JSON, JS & HTML Escaping runs entirely in your browser and helps you complete this task without uploading data to a server.

Is String Escape / Unescape Online —JSON, JS & HTML Escaping free to use?

Yes. This tool is free to use and does not require sign-up.

線上字串跳脫還原 —JSON、JS & HTML 跳脫

格式：

→<code>''</code>).
    </div>
  </div>

<div class="ds-seo-content">
  <section class="ds-seo-section">
    <h2 class="ds-seo-section__title">什麼是字串轉義工具？</h2>
    <p>為 JSON、JavaScript 及 HTML 逸出或取消逸出字串</p>
  </section>

<section class="ds-seo-section">
    <h2 class="ds-seo-section__title">如何使用字串轉義工具</h2>
    <ol>
      <li>在輸入區貼上或輸入要處理的字串。</li>
      <li>選擇目標語言或格式：JavaScript、Python、HTML、JSON 或 URL。</li>
      <li>依需求選擇「轉義」或「取消轉義」。</li>
      <li>複製輸出——結果可直接貼到你的程式碼中。</li>
    </ol>
  </section>
</div>

<div class="ds-related-tools">
  <h2 class="ds-related-title">相關工具</h2>
  <div class="ds-related-grid">
    <a href="json-formatter.html" class="ds-related-card"><span class="ds-related-icon">🎨</span><div><div class="ds-related-name">JSON 格式化</div><div class="ds-related-desc">美化、壓縮、驗證 JSON；轉換為 CSV 或 SQL</div></div></a>
    <a href="url-encode.html" class="ds-related-card"><span class="ds-related-icon">🔗</span><div><div class="ds-related-name">URL 編碼解碼</div><div class="ds-related-desc">編碼或解碼 URL 參數與元件</div></div></a>
    <a href="html-entities.html" class="ds-related-card"><span class="ds-related-icon">🏷️</span><div><div class="ds-related-name">HTML 實體編碼解碼</div><div class="ds-related-desc">編碼或解碼 HTML 實體 — 具名與數字格式</div></div></a>
  </div>
</div>

<details class="ds-seo-more">
  <summary class="ds-seo-more__toggle">
    <span>了解字串轉義</span>
    <span class="ds-seo-more__arrow">▾</span>
  </summary>
  <div class="ds-seo-more__body">
    <details class="ds-seo-collapse">
      <summary>範例</summary>
      <div class="ds-seo-collapse__body">
        <div class="ds-seo-example">
          <div class="ds-seo-example__row">
            <span class="ds-seo-example__label">輸入</span>
            <span class="ds-seo-example__value">輸入：He said "hello\nworld"</span>
          </div>
          <div class="ds-seo-example__row">
            <span class="ds-seo-example__label">輸出</span>
            <span class="ds-seo-example__value">JSON 轉義後："He said \"hello\\nworld\""</span>
          </div>
        </div>
      </div>
    </details>
    <details class="ds-seo-collapse">
      <summary>常見使用情境</summary>
      <div class="ds-seo-collapse__body">
        <ul>
          <li>為 JSON 或 JS 字面值轉義引號與換行符號</li>
          <li>取消轉義從日誌或網路酬載複製的字串</li>
          <li>準備適用於範本或示範的 HTML 安全字串</li>
          <li>在嵌入程式碼前清理測試素材內容</li>
        </ul>
      </div>
    </details>
    <details class="ds-seo-collapse">
      <summary>常見問題</summary>
      <div class="ds-seo-collapse__body">
        <div class="ds-seo-faq-item"><strong>跳脫能防止 SQL 注入嗎？</strong><p>字串跳脫可降低風險，但不能取代正式程式碼中的參數化查詢。</p></div>
        <div class="ds-seo-faq-item"><strong>什麼是 \uXXXX 編碼？</strong><p>Unicode 跳脫序列會以字元碼位表示字元——例如 \u0041 = "A"。</p></div>
        <div class="ds-seo-faq-item"><strong>線上字串跳脫還原 —JSON、JS & HTML 跳脫能做什麼？</strong><p>線上字串跳脫還原 —JSON、JS & HTML 跳脫完全在瀏覽器中執行，協助你完成此工作，無需將資料上傳至伺服器。</p></div>
        <div class="ds-seo-faq-item"><strong>線上字串跳脫還原 —JSON、JS & HTML 跳脫可免費使用嗎？</strong><p>可以。此工具可免費使用，且無需註冊。</p></div>
      </div>
    </details>
  </div>
</details>

<script>
  let mode   = 'escape';
  let format = 'json';

const btnEscape   = document.getElementById('btnEscape');
  const btnUnescape = document.getElementById('btnUnescape');
  const fmtCtrl     = document.getElementById('fmtCtrl');
  const btnSwap     = document.getElementById('btnSwap');
  const inputText   = document.getElementById('inputText');
  const outputText  = document.getElementById('outputText');
  const inputStat   = document.getElementById('inputStat');
  const outputStat  = document.getElementById('outputStat');
  const inputLabel  = document.getElementById('inputLabel');
  const outputLabel = document.getElementById('outputLabel');
  const runLabel    = document.getElementById('runLabel');
  const btnRun      = document.getElementById('btnRun');
  const btnCopyHeader = document.getElementById('btnCopyHeader');
  const btnCopyResult = document.getElementById('btnCopyResult');
  const btnPaste    = document.getElementById('btnPaste');
  const btnClearInput = document.getElementById('btnClearInput');
  const btnClearAll = document.getElementById('btnClearAll');
  const outputPanel = document.getElementById('outputPanel');
  const errorMsg    = document.getElementById('errorMsg');

//  Escape / Unescape logic 
  const ESCAPERS = {
    json: {
      escape(s) {
        return s
          .replace(/\\/g, '\\\\')
          .replace(/"/g,  '\\"')
          .replace(/\n/g, '\\n')
          .replace(/\r/g, '\\r')
          .replace(/\t/g, '\\t')
          .replace(/[\x00-\x1f\x7f-\x9f]/g, c => {
            const h = c.charCodeAt(0).toString(16).padStart(4, '0');
            return `\\u${h}`;
          });
      },
      unescape(s) {
        // Use JSON.parse with surrounding quotes for strict unescape
        return JSON.parse('"' + s + '"');
      }
    },
    js: {
      escape(s) {
        return s
          .replace(/\\/g, '\\\\')
          .replace(/'/g,  "\\'")
          .replace(/"/g,  '\\"')
          .replace(/`/g,  '\\`')
          .replace(/\n/g, '\\n')
          .replace(/\r/g, '\\r')
          .replace(/\t/g, '\\t')
          .replace(/[\x00-\x1f\x7f]/g, c => {
            const h = c.charCodeAt(0).toString(16).padStart(2, '0');
            return `\\x${h}`;
          });
      },
      unescape(s) {
        // eslint-disable-next-line no-new-func
        return Function('"use strict"; return "' + s.replace(/"/g, '\\"') + '"')();
      }
    },
    html: {
      escape(s) {
        return s
          .replace(/&/g,  '&')
          .replace(/</g,  '<')
          .replace(/>/g,  '>')
          .replace(/"/g,  '"')
          .replace(/'/g,  ''');
      },
      unescape(s) {
        const el = document.createElement('textarea');
        el.innerHTML = s;
        return el.value;
      }
    },
    sql: {
      escape(s) {
        return s.replace(/'/g, "''");
      },
      unescape(s) {
        return s.replace(/''/g, "'");
      }
    }
  };

function fmtLabel(fmt) {
    return { json: 'JSON', js: 'JavaScript', html: 'HTML', sql: 'SQL' }[fmt];
  }

function run() {
    const input = inputText.value;
    outputPanel.classList.remove('has-error');

if (!input) {
      outputText.value = '';
      updateStats();
      return;
    }

try {
      outputText.value = mode === 'escape'
        ? ESCAPERS[format].escape(input)
        : ESCAPERS[format].unescape(input);
    } catch (e) {
      outputPanel.classList.add('has-error');
      outputText.value = '';
      errorMsg.textContent = e.message || 'Failed to unescape';
    }

updateStats();
  }

btnEscape.addEventListener('click',   () => setMode('escape'));
  btnUnescape.addEventListener('click', () => setMode('unescape'));

fmtCtrl.querySelectorAll('.seg-btn').forEach(btn => {
    btn.addEventListener('click', () => setFmt(btn.dataset.fmt));
  });

btnSwap.addEventListener('click', () => {
    const out = outputText.value;
    if (!out) return;
    inputText.value = out;
    setMode(mode === 'escape' ? 'unescape' : 'escape');
  });

inputText.addEventListener('input', run);
  btnRun.addEventListener('click', run);

async function copyText(text, button) {
    if (!text) return;
    const orig = button.innerHTML;
    try { await navigator.clipboard.writeText(text); }
    catch {
      const ta = Object.assign(document.createElement('textarea'), { value: text });
      ta.style.cssText = 'position:fixed;opacity:0';
      document.body.appendChild(ta); ta.select(); document.execCommand('copy'); document.body.removeChild(ta);
    }
    button.classList.add('copied');
    button.innerHTML = '<svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"/></svg> Copied';
    setTimeout(() => { button.classList.remove('copied'); button.innerHTML = orig; }, 1500);
  }

btnCopyHeader.addEventListener('click', () => copyText(outputText.value, btnCopyHeader));
  btnCopyResult.addEventListener('click', () => copyText(outputText.value, btnCopyResult));

btnPaste.addEventListener('click', async () => {
    try { inputText.value = await navigator.clipboard.readText(); run(); } catch {}
  });

function clearAll() {
    inputText.value = '';
    outputText.value = '';
    outputPanel.classList.remove('has-error');
    updateStats();
  }

btnClearInput.addEventListener('click', clearAll);
  btnClearAll.addEventListener('click', clearAll);

setMode('escape');
</script>
</div>
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