diff --git a/package.json b/package.json
index bab54cd..c78ecfa 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "@radix-ui/react-tabs": "^1.1.12",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "highlight.js": "^11.11.1",
     "html-to-image": "^1.11.13",
     "lucide-react": "^0.539.0",
     "next": "15.4.6",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ae21e0d..c8c0957 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -38,6 +38,9 @@ importers:
       clsx:
         specifier: ^2.1.1
         version: 2.1.1
+      highlight.js:
+        specifier: ^11.11.1
+        version: 11.11.1
       html-to-image:
         specifier: ^1.11.13
         version: 1.11.13
@@ -1544,6 +1547,10 @@ packages:
     resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
     engines: {node: '>= 0.4'}
 
+  highlight.js@11.11.1:
+    resolution: {integrity: sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w==}
+    engines: {node: '>=12.0.0'}
+
   html-to-image@1.11.13:
     resolution: {integrity: sha512-cuOPoI7WApyhBElTTb9oqsawRvZ0rHhaHwghRLlTuffoD1B2aDemlCruLeZrUIIdvG7gs9xeELEPm6PhuASqrg==}
 
@@ -3876,6 +3883,8 @@ snapshots:
     dependencies:
       function-bind: 1.1.2
 
+  highlight.js@11.11.1: {}
+
   html-to-image@1.11.13: {}
 
   ignore@5.3.2: {}
diff --git a/src/app/json-formatter/page.tsx b/src/app/json-formatter/page.tsx
new file mode 100644
index 0000000..b9691fa
--- /dev/null
+++ b/src/app/json-formatter/page.tsx
@@ -0,0 +1,232 @@
+"use client";
+
+import { useState, useCallback, useEffect } from "react";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { Textarea } from "@/components/ui/textarea";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Switch } from "@/components/ui/switch";
+import { Alert, AlertDescription } from "@/components/ui/alert";
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "@/components/ui/card";
+import hljs from "highlight.js/lib/core";
+import json from "highlight.js/lib/languages/json";
+import "highlight.js/styles/github-dark.css";
+
+// 注册 JSON 语言
+hljs.registerLanguage("json", json);
+import { cn } from "@/lib/utils";
+import { Clipboard, Download, AlertTriangle } from "lucide-react";
+
+interface FormatOptions {
+  indent: number;
+  sortKeys: boolean;
+  colorize: boolean;
+}
+
+export default function JSONFormatter() {
+  const [input, setInput] = useState("");
+  const [output, setOutput] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [options, setOptions] = useState<FormatOptions>({
+    indent: 2,
+    sortKeys: false,
+    colorize: true,
+  });
+  const [highlightedCode, setHighlightedCode] = useState("");
+
+  const formatJSON = useCallback(() => {
+    try {
+      if (!input.trim()) {
+        setOutput("");
+        setError(null);
+        return;
+      }
+
+      let parsedJSON = JSON.parse(input);
+
+      if (options.sortKeys) {
+        parsedJSON = sortObjectKeys(parsedJSON);
+      }
+
+      const formatted = JSON.stringify(parsedJSON, null, options.indent);
+      setOutput(formatted);
+      setError(null);
+    } catch (err) {
+      setError((err as Error).message);
+      setOutput("");
+    }
+  }, [input, options]);
+
+  useEffect(() => {
+    if (options.colorize && output) {
+      const highlighted = hljs.highlight(output, { language: "json" }).value;
+      setHighlightedCode(highlighted);
+    }
+  }, [output, options.colorize]);
+
+  const sortObjectKeys = (obj: any): any => {
+    if (obj === null || typeof obj !== "object") {
+      return obj;
+    }
+
+    if (Array.isArray(obj)) {
+      return obj.map(sortObjectKeys);
+    }
+
+    return Object.keys(obj)
+      .sort()
+      .reduce((result: Record<string, any>, key) => {
+        result[key] = sortObjectKeys(obj[key]);
+        return result;
+      }, {});
+  };
+
+  const copyToClipboard = async () => {
+    try {
+      await navigator.clipboard.writeText(output);
+    } catch (err) {
+      console.error("Failed to copy text:", err);
+    }
+  };
+
+  const downloadJSON = () => {
+    const blob = new Blob([output], { type: "application/json" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = "formatted.json";
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    URL.revokeObjectURL(url);
+  };
+
+  return (
+    <main className="flex min-h-screen flex-col items-center justify-center p-4">
+      <Card className="w-full max-w-6xl mx-auto">
+        <CardHeader>
+          <CardTitle>JSON 格式化工具</CardTitle>
+          <CardDescription>
+            将 JSON 文本格式化，支持语法高亮、键值排序等功能
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="grid gap-6">
+            <div className="space-y-2">
+              <div className="flex justify-between items-center">
+                <Label>配置选项</Label>
+                <div className="flex items-center gap-4">
+                  <div className="flex items-center gap-2">
+                    <Label htmlFor="indent">缩进空格数</Label>
+                    <Input
+                      id="indent"
+                      type="number"
+                      min={0}
+                      max={8}
+                      value={options.indent}
+                      onChange={(e) =>
+                        setOptions({
+                          ...options,
+                          indent: parseInt(e.target.value) || 0,
+                        })
+                      }
+                      className="w-20"
+                    />
+                  </div>
+                  <div className="flex items-center gap-2">
+                    <Switch
+                      id="sort-keys"
+                      checked={options.sortKeys}
+                      onCheckedChange={(checked) =>
+                        setOptions({ ...options, sortKeys: checked })
+                      }
+                    />
+                    <Label htmlFor="sort-keys">键值排序</Label>
+                  </div>
+                  <div className="flex items-center gap-2">
+                    <Switch
+                      id="colorize"
+                      checked={options.colorize}
+                      onCheckedChange={(checked) =>
+                        setOptions({ ...options, colorize: checked })
+                      }
+                    />
+                    <Label htmlFor="colorize">语法高亮</Label>
+                  </div>
+                </div>
+              </div>
+            </div>
+
+            <div className="grid md:grid-cols-2 gap-4">
+              <div className="space-y-2">
+                <Label>输入 JSON</Label>
+                <Textarea
+                  placeholder="在此输入 JSON 文本..."
+                  value={input}
+                  onChange={(e) => {
+                    setInput(e.target.value);
+                    formatJSON();
+                  }}
+                  className="h-[500px] font-mono"
+                />
+              </div>
+
+              <div className="space-y-2">
+                <div className="flex justify-between items-center">
+                  <Label>格式化结果</Label>
+                  <div className="flex gap-2">
+                    <Button
+                      variant="outline"
+                      size="sm"
+                      onClick={copyToClipboard}
+                      disabled={!output}
+                    >
+                      <Clipboard className="w-4 h-4 mr-2" />
+                      复制
+                    </Button>
+                    <Button
+                      variant="outline"
+                      size="sm"
+                      onClick={downloadJSON}
+                      disabled={!output}
+                    >
+                      <Download className="w-4 h-4 mr-2" />
+                      下载
+                    </Button>
+                  </div>
+                </div>
+                {error ? (
+                  <Alert variant="destructive">
+                    <AlertTriangle className="h-4 w-4" />
+                    <AlertDescription>{error}</AlertDescription>
+                  </Alert>
+                ) : (
+                  <pre
+                    className={cn(
+                      "block p-4 rounded-lg border bg-muted h-[500px] overflow-auto font-mono"
+                    )}
+                  >
+                    {options.colorize ? (
+                      <code
+                        dangerouslySetInnerHTML={{ __html: highlightedCode }}
+                      />
+                    ) : (
+                      <code>{output}</code>
+                    )}
+                  </pre>
+                )}
+              </div>
+            </div>
+          </div>
+        </CardContent>
+      </Card>
+    </main>
+  );
+}
diff --git a/src/components/ui/alert.tsx b/src/components/ui/alert.tsx
new file mode 100644
index 0000000..1421354
--- /dev/null
+++ b/src/components/ui/alert.tsx
@@ -0,0 +1,66 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/lib/utils"
+
+const alertVariants = cva(
+  "relative w-full rounded-lg border px-4 py-3 text-sm grid has-[>svg]:grid-cols-[calc(var(--spacing)*4)_1fr] grid-cols-[0_1fr] has-[>svg]:gap-x-3 gap-y-0.5 items-start [&>svg]:size-4 [&>svg]:translate-y-0.5 [&>svg]:text-current",
+  {
+    variants: {
+      variant: {
+        default: "bg-card text-card-foreground",
+        destructive:
+          "text-destructive bg-card [&>svg]:text-current *:data-[slot=alert-description]:text-destructive/90",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Alert({
+  className,
+  variant,
+  ...props
+}: React.ComponentProps<"div"> & VariantProps<typeof alertVariants>) {
+  return (
+    <div
+      data-slot="alert"
+      role="alert"
+      className={cn(alertVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+function AlertTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-title"
+      className={cn(
+        "col-start-2 line-clamp-1 min-h-4 font-medium tracking-tight",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function AlertDescription({
+  className,
+  ...props
+}: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="alert-description"
+      className={cn(
+        "text-muted-foreground col-start-2 grid justify-items-start gap-1 text-sm [&_p]:leading-relaxed",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Alert, AlertTitle, AlertDescription }
diff --git a/src/lib/tools.ts b/src/lib/tools.ts
index a7ec261..ae5212e 100644
--- a/src/lib/tools.ts
+++ b/src/lib/tools.ts
@@ -9,5 +9,10 @@ export const tools: Tool[] = [
     title: "Rail Transit Guide",
     description: "轨道交通导视生成器",
     href: "/rt-guide",
+  },
+  {
+    title: "JSON formatter",
+    description: "JSON 格式化工具",
+    href: "/json-formatter",
   }
 ];