diff --git a/index.html b/index.html
index 076aea2..daa6831 100644
--- a/index.html
+++ b/index.html
@@ -382,6 +382,15 @@
           <div class="tooltip">颜色选择器</div>
         </div>
 
+        <div class="tool-item" data-tool="json">
+          <div class="tool-icon">📋</div>
+          <div class="tool-info">
+            <h3>JSON 格式化</h3>
+            <p>JSON 代码格式化、压缩和验证工具</p>
+          </div>
+          <div class="tooltip">JSON 格式化</div>
+        </div>
+
         <div class="tool-item" data-tool="other">
           <div class="tool-icon">⚙️</div>
           <div class="tool-info">
@@ -464,6 +473,10 @@
           title: "颜色选择器",
           url: "color_pick.html",
         },
+        json: {
+          title: "JSON 格式化",
+          url: "json_formatter.html",
+        },
         other: {
           title: "其他功能",
           url: "other_function.html",
@@ -536,12 +549,13 @@
         // Ctrl/Cmd + 数字键快速切换工具
         if (e.ctrlKey || e.metaKey) {
           const key = parseInt(e.key);
-          if (key >= 1 && key <= 5) {
+          if (key >= 1 && key <= 6) {
             const toolNames = [
               "welcome",
               "calculator",
               "number",
               "color",
+              "json",
               "other",
             ];
             const toolName = toolNames[key - 1];
diff --git a/json_formatter.html b/json_formatter.html
new file mode 100644
index 0000000..dceaf3e
--- /dev/null
+++ b/json_formatter.html
@@ -0,0 +1,615 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>JSON 格式化工具 - 功能工具箱</title>
+    <style>
+      * {
+        margin: 0;
+        padding: 0;
+        box-sizing: border-box;
+      }
+
+      body {
+        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
+        margin: 0;
+        padding: 0;
+        background: white;
+        color: #333;
+      }
+
+      .container {
+        width: 100%;
+        height: 100vh;
+        display: flex;
+        flex-direction: column;
+      }
+
+      .header {
+        background: #f5f5f5;
+        padding: 20px;
+        text-align: center;
+        border-bottom: 1px solid #ddd;
+      }
+
+      .header h1 {
+        font-size: 1.5em;
+        margin-bottom: 5px;
+        font-weight: 600;
+      }
+
+      .header p {
+        font-size: 0.9em;
+        color: #666;
+        margin: 0;
+      }
+
+      .controls {
+        padding: 15px 20px;
+        background: #f9f9f9;
+        border-bottom: 1px solid #ddd;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        flex-wrap: wrap;
+        gap: 10px;
+      }
+
+      .control-group {
+        display: flex;
+        gap: 10px;
+        align-items: center;
+      }
+
+      button {
+        padding: 8px 16px;
+        border: 1px solid #ddd;
+        border-radius: 4px;
+        font-size: 14px;
+        cursor: pointer;
+        display: flex;
+        align-items: center;
+        gap: 5px;
+        background: white;
+      }
+
+      button:hover {
+        background: #f0f0f0;
+      }
+
+      .btn-primary {
+        background: #007bff;
+        color: white;
+        border-color: #007bff;
+      }
+
+      .btn-primary:hover {
+        background: #0056b3;
+      }
+
+      .btn-secondary {
+        background: #6c757d;
+        color: white;
+        border-color: #6c757d;
+      }
+
+      .btn-secondary:hover {
+        background: #5a6268;
+      }
+
+      .btn-success {
+        background: #28a745;
+        color: white;
+        border-color: #28a745;
+      }
+
+      .btn-success:hover {
+        background: #218838;
+      }
+
+      .editor-container {
+        display: flex;
+        height: 600px;
+      }
+
+      .editor-panel {
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+        position: relative;
+      }
+
+      .editor-header {
+        padding: 10px 15px;
+        background: #f5f5f5;
+        border-bottom: 1px solid #ddd;
+        font-weight: 600;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        font-size: 14px;
+      }
+
+      .editor-content {
+        flex: 1;
+        position: relative;
+      }
+
+      textarea {
+        width: 100%;
+        height: 100%;
+        border: none;
+        outline: none;
+        padding: 15px;
+        font-family: "Consolas", "Monaco", "Courier New", monospace;
+        font-size: 13px;
+        line-height: 1.4;
+        resize: none;
+        background: white;
+        color: #333;
+      }
+
+      .output-area {
+        background: white;
+        padding: 15px;
+        font-family: "Consolas", "Monaco", "Courier New", monospace;
+        font-size: 13px;
+        line-height: 1.4;
+        white-space: pre-wrap;
+        overflow: auto;
+        height: 100%;
+        color: #333;
+      }
+
+      .error-message {
+        background: #f8d7da;
+        color: #721c24;
+        padding: 15px;
+        border-radius: 8px;
+        margin: 20px;
+        border: 1px solid #f5c6cb;
+        display: none;
+      }
+
+      .success-message {
+        background: #d4edda;
+        color: #155724;
+        padding: 15px;
+        border-radius: 8px;
+        margin: 20px;
+        border: 1px solid #c3e6cb;
+        display: none;
+      }
+
+      .divider {
+        width: 2px;
+        background: #ddd;
+        cursor: col-resize;
+      }
+
+      .divider:hover {
+        background: #bbb;
+      }
+
+      .status-bar {
+        background: #f5f5f5;
+        border-top: 1px solid #ddd;
+        padding: 8px 15px;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        font-size: 12px;
+        color: #666;
+      }
+
+      .char-count {
+        color: #999;
+      }
+
+      .formatting-options {
+        display: flex;
+        gap: 15px;
+        align-items: center;
+      }
+
+      .option-group {
+        display: flex;
+        align-items: center;
+        gap: 5px;
+      }
+
+      .option-group label {
+        font-size: 14px;
+        color: #666;
+      }
+
+      .option-group input[type="number"] {
+        width: 60px;
+        padding: 4px 8px;
+        border: 1px solid #ddd;
+        border-radius: 3px;
+        font-size: 14px;
+      }
+
+      @media (max-width: 768px) {
+        .editor-container {
+          flex-direction: column;
+          height: auto;
+        }
+
+        .divider {
+          width: 100%;
+          height: 4px;
+          cursor: row-resize;
+        }
+
+        .divider::before {
+          content: "⋯";
+        }
+
+        .editor-panel {
+          min-height: 300px;
+        }
+
+        .controls {
+          flex-direction: column;
+          align-items: stretch;
+        }
+
+        .control-group {
+          justify-content: center;
+        }
+      }
+
+      .loading {
+        display: none;
+        color: #007bff;
+        font-style: italic;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="container">
+      <div class="header">
+        <h1>📋 JSON 格式化工具</h1>
+        <p>美化和验证您的 JSON 代码，支持实时格式化和错误检查</p>
+      </div>
+
+      <div class="controls">
+        <div class="control-group">
+          <button class="btn-primary" onclick="formatJSON()">格式化</button>
+          <button class="btn-secondary" onclick="minifyJSON()">压缩</button>
+          <button class="btn-success" onclick="copyFormatted()">
+            复制结果
+          </button>
+          <button class="btn-secondary" onclick="clearAll()">清空</button>
+        </div>
+
+        <div class="formatting-options">
+          <div class="option-group">
+            <label for="indentSize">缩进:</label>
+            <input
+              type="number"
+              id="indentSize"
+              value="2"
+              min="1"
+              max="8"
+              onchange="formatJSON()"
+            />
+          </div>
+          <div class="option-group">
+            <input type="checkbox" id="sortKeys" onchange="formatJSON()" />
+            <label for="sortKeys">排序键名</label>
+          </div>
+        </div>
+      </div>
+
+      <div class="editor-container">
+        <div class="editor-panel">
+          <div class="editor-header">
+            <span>输入 JSON</span>
+            <span class="char-count" id="inputCount">0 字符</span>
+          </div>
+          <div class="editor-content">
+            <textarea
+              id="jsonInput"
+              placeholder='在此粘贴您的 JSON 代码...
+例如: {"name": "张三", "age": 25}'
+              oninput="handleInputChange()"
+            ></textarea>
+          </div>
+        </div>
+
+        <div class="divider"></div>
+
+        <div class="editor-panel">
+          <div class="editor-header">
+            <span>格式化结果</span>
+            <span class="char-count" id="outputCount">0 字符</span>
+          </div>
+          <div class="editor-content">
+            <div id="jsonOutput" class="output-area">
+              格式化结果将显示在这里...
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div class="error-message" id="errorMessage"></div>
+      <div class="success-message" id="successMessage"></div>
+
+      <div class="status-bar">
+        <span id="status">就绪</span>
+        <span id="formatStatus" class="loading">正在格式化...</span>
+      </div>
+    </div>
+
+    <script>
+      let isAutoFormatting = true;
+
+      function handleInputChange() {
+        updateCharCount();
+        if (isAutoFormatting) {
+          // 延迟格式化，避免频繁处理
+          clearTimeout(window.formatTimeout);
+          window.formatTimeout = setTimeout(() => {
+            formatJSON();
+          }, 500);
+        }
+      }
+
+      function updateCharCount() {
+        const input = document.getElementById("jsonInput");
+        const output = document.getElementById("jsonOutput");
+        const inputCount = document.getElementById("inputCount");
+        const outputCount = document.getElementById("outputCount");
+
+        inputCount.textContent = input.value.length + " 字符";
+        outputCount.textContent = output.textContent.length + " 字符";
+      }
+
+      function formatJSON() {
+        const input = document.getElementById("jsonInput").value.trim();
+        const output = document.getElementById("jsonOutput");
+        const errorMessage = document.getElementById("errorMessage");
+        const successMessage = document.getElementById("successMessage");
+        const formatStatus = document.getElementById("formatStatus");
+        const indentSize = parseInt(
+          document.getElementById("indentSize").value,
+        );
+        const sortKeys = document.getElementById("sortKeys").checked;
+
+        // 清除之前的消息
+        errorMessage.style.display = "none";
+        successMessage.style.display = "none";
+        formatStatus.style.display = "block";
+
+        if (!input) {
+          output.textContent = "格式化结果将显示在这里...";
+          formatStatus.style.display = "none";
+          updateCharCount();
+          return;
+        }
+
+        try {
+          // 解析 JSON
+          let jsonObj = JSON.parse(input);
+
+          // 如果选择排序键名
+          if (sortKeys && typeof jsonObj === "object" && jsonObj !== null) {
+            jsonObj = sortObjectKeys(jsonObj);
+          }
+
+          // 格式化 JSON
+          const formatted = JSON.stringify(jsonObj, null, indentSize);
+
+          // 语法高亮
+          output.innerHTML = highlightJSON(formatted);
+
+          // 显示成功消息
+          successMessage.textContent = "✅ JSON 格式化成功！";
+          successMessage.style.display = "block";
+
+          // 3秒后隐藏成功消息
+          setTimeout(() => {
+            successMessage.style.display = "none";
+          }, 3000);
+        } catch (error) {
+          // 显示错误
+          output.textContent = "";
+          errorMessage.innerHTML = `❌ JSON 格式错误: ${error.message}`;
+          errorMessage.style.display = "block";
+        }
+
+        formatStatus.style.display = "none";
+        updateCharCount();
+      }
+
+      function minifyJSON() {
+        const input = document.getElementById("jsonInput").value.trim();
+        const output = document.getElementById("jsonOutput");
+        const errorMessage = document.getElementById("errorMessage");
+        const successMessage = document.getElementById("successMessage");
+
+        if (!input) {
+          output.textContent = "请先输入 JSON 代码";
+          return;
+        }
+
+        try {
+          const jsonObj = JSON.parse(input);
+          const minified = JSON.stringify(jsonObj);
+          output.textContent = minified;
+
+          successMessage.textContent = "✅ JSON 压缩成功！";
+          successMessage.style.display = "block";
+          errorMessage.style.display = "none";
+
+          setTimeout(() => {
+            successMessage.style.display = "none";
+          }, 3000);
+        } catch (error) {
+          errorMessage.innerHTML = `❌ JSON 格式错误: ${error.message}`;
+          errorMessage.style.display = "block";
+        }
+
+        updateCharCount();
+      }
+
+      function sortObjectKeys(obj) {
+        if (Array.isArray(obj)) {
+          return obj.map(sortObjectKeys);
+        }
+        if (obj !== null && typeof obj === "object") {
+          const sorted = {};
+          Object.keys(obj)
+            .sort()
+            .forEach((key) => {
+              sorted[key] = sortObjectKeys(obj[key]);
+            });
+          return sorted;
+        }
+        return obj;
+      }
+
+      function highlightJSON(json) {
+        return json.replace(
+          /("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
+          function (match) {
+            let cls = "number";
+            if (/^"/.test(match)) {
+              if (/:$/.test(match)) {
+                cls = "key";
+              } else {
+                cls = "string";
+              }
+            } else if (/true|false/.test(match)) {
+              cls = "boolean";
+            } else if (/null/.test(match)) {
+              cls = "null";
+            }
+            return (
+              '<span style="color: ' +
+              getJSONColor(cls) +
+              '">' +
+              match +
+              "</span>"
+            );
+          },
+        );
+      }
+
+      function getJSONColor(type) {
+        const colors = {
+          key: "#0969da",
+          string: "#032f62",
+          number: "#005cc5",
+          boolean: "#d73a49",
+          null: "#6f42c1",
+        };
+        return colors[type] || "#24292e";
+      }
+
+      function copyFormatted() {
+        const output = document.getElementById("jsonOutput");
+        const successMessage = document.getElementById("successMessage");
+
+        if (
+          !output.textContent ||
+          output.textContent === "格式化结果将显示在这里..."
+        ) {
+          alert("没有可复制的内容！");
+          return;
+        }
+
+        // 获取纯文本内容
+        const textToCopy = output.textContent || output.innerText;
+
+        navigator.clipboard
+          .writeText(textToCopy)
+          .then(() => {
+            successMessage.textContent = "📋 已复制到剪贴板！";
+            successMessage.style.display = "block";
+
+            setTimeout(() => {
+              successMessage.style.display = "none";
+            }, 2000);
+          })
+          .catch(() => {
+            // 降级方案
+            const textArea = document.createElement("textarea");
+            textArea.value = textToCopy;
+            document.body.appendChild(textArea);
+            textArea.select();
+            document.execCommand("copy");
+            document.body.removeChild(textArea);
+
+            successMessage.textContent = "📋 已复制到剪贴板！";
+            successMessage.style.display = "block";
+
+            setTimeout(() => {
+              successMessage.style.display = "none";
+            }, 2000);
+          });
+      }
+
+      function clearAll() {
+        document.getElementById("jsonInput").value = "";
+        document.getElementById("jsonOutput").textContent =
+          "格式化结果将显示在这里...";
+        document.getElementById("errorMessage").style.display = "none";
+        document.getElementById("successMessage").style.display = "none";
+        updateCharCount();
+      }
+
+      // 键盘快捷键
+      document.addEventListener("keydown", function (e) {
+        // Ctrl/Cmd + Enter 格式化
+        if ((e.ctrlKey || e.metaKey) && e.key === "Enter") {
+          e.preventDefault();
+          formatJSON();
+        }
+        // Ctrl/Cmd + Shift + C 复制结果
+        if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === "C") {
+          e.preventDefault();
+          copyFormatted();
+        }
+        // Ctrl/Cmd + Shift + M 压缩
+        if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key === "M") {
+          e.preventDefault();
+          minifyJSON();
+        }
+      });
+
+      // 页面加载完成后的初始化
+      document.addEventListener("DOMContentLoaded", function () {
+        const input = document.getElementById("jsonInput");
+        input.focus();
+        updateCharCount();
+      });
+
+      // 示例 JSON 数据
+      const exampleJSON = {
+        name: "张三",
+        age: 25,
+        city: "北京",
+        skills: ["JavaScript", "Python", "Java"],
+        profile: {
+          email: "zhangsan@example.com",
+          phone: "13800138000",
+          address: {
+            street: "朝阳区xxx街道",
+            zipcode: "100000",
+          },
+        },
+        isActive: true,
+        registeredAt: null,
+      };
+
+      // 如果需要加载示例，可以取消下面的注释
+      // document.getElementById('jsonInput').value = JSON.stringify(exampleJSON);
+      // formatJSON();
+    </script>
+  </body>
+</html>
\ No newline at end of file
