diff --git a/auth.v b/auth.v
index 86f4f50..dae3d89 100644
--- a/auth.v
+++ b/auth.v
@@ -3,7 +3,7 @@ module hono
 import crypto.sha256
 import crypto.rand
 import time
-import json
+import x.json2
 
 // 用户角色枚举
 pub enum UserRole {
@@ -242,7 +242,7 @@ pub fn (mut auth AuthManager) logout(token string) ! {
 // 创建菜单项
 pub fn (mut auth AuthManager) create_menu_item(name string, path string, icon string, parent_id int, sort_order int, permissions []string) !MenuItem {
 	now := int(time.now().unix())
-	permissions_json := json.encode(permissions)
+	permissions_json := json2.encode[[]string](permissions)
 	permissions_sql := permissions_json.replace('"', "''")
 
 	auth.db.db.exec('INSERT INTO menu_items (name, path, icon, parent_id, sort_order, permissions, status, created_at, updated_at) VALUES ("$name", "$path", "$icon", $parent_id, $sort_order, "$permissions_sql", 1, $now, $now)')
@@ -280,7 +280,7 @@ pub fn (auth AuthManager) get_all_menu_items() ![]MenuItem {
 	mut menus := []MenuItem{}
 	for row in rows {
 		permissions_str := row.vals[6]
-		permissions := json.decode([]string, permissions_str) or { []string{} }
+		permissions := json2.decode[[]string](permissions_str) or { []string{} }
 
 		menus << MenuItem{
 			id: row.vals[0].int()
@@ -327,7 +327,7 @@ pub fn (auth AuthManager) get_user_menus(user User) ![]MenuItem {
 	mut menus := []MenuItem{}
 	for row in rows {
 		permissions_str := row.vals[6]
-		permissions := json.decode([]string, permissions_str) or { []string{} }
+		permissions := json2.decode[[]string](permissions_str) or { []string{} }
 
 		menus << MenuItem{
 			id: row.vals[0].int()
diff --git a/auth_routes.v b/auth_routes.v
index cde9531..d5bc253 100644
--- a/auth_routes.v
+++ b/auth_routes.v
@@ -1,6 +1,6 @@
 module hono
 
-import json
+import x.json2
 import net.http
 
 // 登录请求结构
@@ -30,20 +30,64 @@ pub:
 	permissions []string
 }
 
+// 响应结构体
+struct ErrorResponseBody {
+	error string
+}
+
+struct LoginResponseBody {
+	token      string
+	expires_at string
+}
+
+struct RegisterResponseBody {
+	user_id  string
+	username string
+	email    string
+	role     string
+}
+
+struct MessageResponseBody {
+	message string
+}
+
+struct ProfileResponseBody {
+	user_id  string
+	username string
+	email    string
+	role     string
+	active   string
+}
+
+struct MenusResponseBody {
+	menus []MenuItem
+}
+
+struct MenuCreateResponseBody {
+	menu_id     string
+	name        string
+	path        string
+	icon        string
+	parent_id   string
+	sort_order  string
+	permissions string
+	active      string
+}
+
 // 认证中间件（只做校验，不注入 user）
 pub fn auth_middleware(auth_manager AuthManager) ContextMiddleware {
 	return fn [auth_manager] (mut c Context, next fn (mut Context) http.Response) http.Response {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		if token == '' {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Authorization token required'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Authorization token required'
 			}))
 		}
 		_ := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Invalid or expired token'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid or expired token'
 			}))
 		}
 		return next(mut c)
@@ -56,14 +100,14 @@ pub fn permission_middleware(auth_manager AuthManager, required_permission strin
 		token := c.req.header.get_custom('Authorization') or { '' }
 		user := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Invalid or expired token'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid or expired token'
 			}))
 		}
 		if !auth_manager.check_permission(user, required_permission) {
 			c.status(403)
-			return c.json(json.encode({
-				'error': 'Insufficient permissions'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Insufficient permissions'
 			}))
 		}
 		return next(mut c)
@@ -75,31 +119,31 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 	// 登录路由
 	app.post('/api/auth/login', fn [mut auth_manager] (mut c Context) http.Response {
 		body := c.body
-		login_req := json.decode(LoginRequest, body) or {
+		login_req := json2.decode[LoginRequest](body) or {
 			c.status(400)
-			return c.json(json.encode({
-				'error': 'Invalid request body'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid request body'
 			}))
 		}
 		session := auth_manager.login(login_req.username, login_req.password) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'token': session.token.str()
-			'expires_at': session.expires_at.str()
+		return c.json(json2.encode[LoginResponseBody](LoginResponseBody{
+			token: session.token.str()
+			expires_at: session.expires_at.str()
 		}))
 	})
 
 	// 注册路由
 	app.post('/api/auth/register', fn [mut auth_manager] (mut c Context) http.Response {
 		body := c.body
-		register_req := json.decode(RegisterRequest, body) or {
+		register_req := json2.decode[RegisterRequest](body) or {
 			c.status(400)
-			return c.json(json.encode({
-				'error': 'Invalid request body'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid request body'
 			}))
 		}
 		role := match register_req.role {
@@ -111,15 +155,15 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 		}
 		user := auth_manager.create_user(register_req.username, register_req.email, register_req.password, role) or {
 			c.status(400)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'user_id': user.id.str()
-			'username': user.username
-			'email': user.email
-			'role': user.role.str()
+		return c.json(json2.encode[RegisterResponseBody](RegisterResponseBody{
+			user_id: user.id.str()
+			username: user.username
+			email: user.email
+			role: user.role.str()
 		}))
 	})
 
@@ -128,18 +172,18 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		if token == '' {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Authorization token required'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Authorization token required'
 			}))
 		}
 		auth_manager.logout(token) or {
 			c.status(500)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'message': 'Logged out successfully'
+		return c.json(json2.encode[MessageResponseBody](MessageResponseBody{
+			message: 'Logged out successfully'
 		}))
 	})
 
@@ -148,16 +192,16 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		user := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Invalid or expired token'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid or expired token'
 			}))
 		}
-		return c.json(json.encode({
-			'user_id': user.id.str()
-			'username': user.username
-			'email': user.email
-			'role': user.role.str()
-			'active': user.status.str()
+		return c.json(json2.encode[ProfileResponseBody](ProfileResponseBody{
+			user_id: user.id.str()
+			username: user.username
+			email: user.email
+			role: user.role.str()
+			active: user.status.str()
 		}))
 	})
 
@@ -166,45 +210,45 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		user := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'Invalid or expired token'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid or expired token'
 			}))
 		}
 		menus := auth_manager.get_user_menus(user) or {
 			c.status(500)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'menus': menus
+		return c.json(json2.encode[MenusResponseBody](MenusResponseBody{
+			menus: menus
 		}))
 	})
 
 	// 创建菜单项路由 (需要管理员权限)
 	app.post('/api/auth/menus', fn [mut auth_manager] (mut c Context) http.Response {
 		body := c.body
-		menu_req := json.decode(MenuCreateRequest, body) or {
+		menu_req := json2.decode[MenuCreateRequest](body) or {
 			c.status(400)
-			return c.json(json.encode({
-				'error': 'Invalid request body'
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: 'Invalid request body'
 			}))
 		}
 		menu := auth_manager.create_menu_item(menu_req.name, menu_req.path, menu_req.icon, menu_req.parent_id, menu_req.sort_order, menu_req.permissions) or {
 			c.status(400)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'menu_id': menu.id.str()
-			'name': menu.name
-			'path': menu.path
-			'icon': menu.icon
-			'parent_id': menu.parent_id.str()
-			'sort_order': menu.sort_order.str()
-			'permissions': json.encode(menu.permissions)
-			'active': menu.status.str()
+		return c.json(json2.encode[MenuCreateResponseBody](MenuCreateResponseBody{
+			menu_id: menu.id.str()
+			name: menu.name
+			path: menu.path
+			icon: menu.icon
+			parent_id: menu.parent_id.str()
+			sort_order: menu.sort_order.str()
+			permissions: json2.encode[[]string](menu.permissions)
+			active: menu.status.str()
 		}))
 	})
 
@@ -212,12 +256,12 @@ pub fn register_auth_routes(mut app Hono, mut auth_manager AuthManager) {
 	app.get('/api/auth/menus/all', fn [auth_manager] (mut c Context) http.Response {
 		menus := auth_manager.get_all_menu_items() or {
 			c.status(500)
-			return c.json(json.encode({
-				'error': err.msg()
+			return c.json(json2.encode[ErrorResponseBody](ErrorResponseBody{
+				error: err.msg()
 			}))
 		}
-		return c.json(json.encode({
-			'menus': menus
+		return c.json(json2.encode[MenusResponseBody](MenusResponseBody{
+			menus: menus
 		}))
 	})
-} 
\ No newline at end of file
+} 
diff --git a/config.v b/config.v
index 2b2e42b..4013077 100644
--- a/config.v
+++ b/config.v
@@ -1,7 +1,7 @@
 module hono
 
 import os
-import json
+import x.json2
 
 // 服务器配置结构
 pub struct ServerConfig {
@@ -107,7 +107,7 @@ pub fn load_config(config_path string) !AppConfig {
 		return error('无法读取配置文件: ${err}')
 	}
 	
-	config := json.decode(AppConfig, config_content) or {
+	config := json2.decode[AppConfig](config_content) or {
 		return error('配置文件格式错误: ${err}')
 	}
 	
@@ -122,7 +122,7 @@ pub fn load_config(config_path string) !AppConfig {
 
 // 保存配置到文件
 pub fn save_config(config AppConfig, config_path string) ! {
-	config_json := json.encode_pretty(config)
+	config_json := json2.encode[AppConfig](config, prettify: true)
 	
 	// 确保目录存在
 	config_dir := os.dir(config_path)
diff --git a/error_handler.v b/error_handler.v
index 850a32f..b6a6f62 100644
--- a/error_handler.v
+++ b/error_handler.v
@@ -1,7 +1,7 @@
 module hono
 
 import net.http
-import json
+import x.json2
 
 // 错误类型枚举
 pub enum ErrorType {
@@ -51,7 +51,7 @@ pub fn (eh DefaultErrorHandler) handle_error(mut c Context, error_type ErrorType
 	}
 	
 	c.status(int(error_type))
-	return c.json(json.encode(error_response))
+	return c.json(json2.encode[ErrorResponse](error_response))
 }
 
 // 获取错误名称
diff --git a/examples/auth_example.v b/examples/auth_example.v
index 1483bfc..22c775f 100644
--- a/examples/auth_example.v
+++ b/examples/auth_example.v
@@ -2,7 +2,28 @@ module main
 
 import hono
 import net.http
-import json
+import x.json2
+
+// 响应结构体
+struct ErrorResponse {
+	error string
+}
+
+struct ProtectedUserResponse {
+	message  string
+	user_id  string
+	username string
+	email    string
+	role     string
+}
+
+struct ProtectedAdminResponse {
+	message  string
+	user_id  string
+	username string
+	email    string
+	role     string
+}
 
 fn main() {
 	// 创建数据库管理器
@@ -37,16 +58,16 @@ fn main() {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		user := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'User not found'
+			return c.json(json2.encode[ErrorResponse](ErrorResponse{
+				error: 'User not found'
 			}))
 		}
-		return c.json(json.encode({
-			'message': 'This is a protected user route',
-			'user_id': user.id.str(),
-			'username': user.username,
-			'email': user.email,
-			'role': user.role.str()
+		return c.json(json2.encode[ProtectedUserResponse](ProtectedUserResponse{
+			message: 'This is a protected user route'
+			user_id: user.id.str()
+			username: user.username
+			email: user.email
+			role: user.role.str()
 		}))
 	})
 
@@ -54,22 +75,22 @@ fn main() {
 		token := c.req.header.get_custom('Authorization') or { '' }
 		user := auth_manager.verify_token(token) or {
 			c.status(401)
-			return c.json(json.encode({
-				'error': 'User not found'
+			return c.json(json2.encode[ErrorResponse](ErrorResponse{
+				error: 'User not found'
 			}))
 		}
 		if !auth_manager.check_permission(user, 'manage') {
 			c.status(403)
-			return c.json(json.encode({
-				'error': 'Admin access required'
+			return c.json(json2.encode[ErrorResponse](ErrorResponse{
+				error: 'Admin access required'
 			}))
 		}
-		return c.json(json.encode({
-			'message': 'This is a protected admin route',
-			'user_id': user.id.str(),
-			'username': user.username,
-			'email': user.email,
-			'role': user.role.str()
+		return c.json(json2.encode[ProtectedAdminResponse](ProtectedAdminResponse{
+			message: 'This is a protected admin route'
+			user_id: user.id.str()
+			username: user.username
+			email: user.email
+			role: user.role.str()
 		}))
 	})
 
@@ -142,4 +163,4 @@ fn create_sample_users(mut auth_manager hono.AuthManager) {
 	auth_manager.create_user('guest', 'guest@example.com', 'guest123', hono.UserRole.guest) or { return }
 
 	println('✅ 示例用户已创建')
-} 
\ No newline at end of file
+} 
diff --git a/examples/stream_test.v b/examples/stream_test.v
index 90c12bc..e0d0ca7 100644
--- a/examples/stream_test.v
+++ b/examples/stream_test.v
@@ -11,13 +11,13 @@ fn main() {
 	create_test_files()
 	
 	// 创建应用
-	mut app := hono.Hono.new()
+	mut app := &hono.Hono{}
 	
 	// 测试路由
 	setup_test_routes(mut app)
 	
 	// 在后台启动服务器
-	go app.listen(':8081')
+	spawn app.listen(':8081')
 	
 	// 等待服务器启动
 	time.sleep(2 * time.second)
@@ -227,8 +227,8 @@ fn test_smart_selection() {
 	if result2.exit_code == 0 {
 		// 检查下载的文件大小
 		if os.exists('large_output.txt') {
-			downloaded_size := os.file_size('large_output.txt') or { 0 }
-			original_size := os.file_size('test_large.txt') or { 0 }
+			downloaded_size := os.file_size('large_output.txt')
+			original_size := os.file_size('test_large.txt')
 			if downloaded_size == original_size {
 				println('✅ 智能选择大文件: 成功 (${downloaded_size} bytes)')
 			} else {
diff --git a/logger.v b/logger.v
index 5ef566d..8cc333a 100644
--- a/logger.v
+++ b/logger.v
@@ -2,7 +2,7 @@ module hono
 
 import os
 import time
-import json
+import x.json2
 
 // 日志级别枚举
 pub enum LogLevel {
@@ -150,7 +150,7 @@ fn (l &Logger) format_text_log(entry LogEntry) string {
 
 // 格式化日志消息（JSON格式）
 fn (l &Logger) format_json_log(entry LogEntry) string {
-	return json.encode(entry)
+	return json2.encode[LogEntry](entry)
 }
 
 // 写入日志到文件
diff --git a/tests/test_comprehensive_suite.v b/tests/test_comprehensive_suite.v
index a4991f5..c6d10b6 100644
--- a/tests/test_comprehensive_suite.v
+++ b/tests/test_comprehensive_suite.v
@@ -478,7 +478,7 @@ fn test_integration(mut stats TestStats) {
 	})
 	
 	// 验证路由统计
-	static_count, dynamic_count, cache_count, _ := app.get_router_stats()
+	static_count, dynamic_count, _, _ := app.get_router_stats()
 	
 	if static_count + dynamic_count < 2 {
 		stats.fail_test('路由添加失败')
diff --git a/tests/test_dynamic_routes_advanced.v b/tests/test_dynamic_routes_advanced.v
index ab8dda0..c8c0a17 100644
--- a/tests/test_dynamic_routes_advanced.v
+++ b/tests/test_dynamic_routes_advanced.v
@@ -1,5 +1,4 @@
 import hono
-import time
 import net.http
 
 fn main() {
@@ -200,7 +199,7 @@ fn test_restful_api_patterns() {
 	
 	mut restful_success := 0
 	for test in restful_tests {
-		if match_result := app.fast_router.match_route(test['method'], test['path']) {
+		if _ := app.fast_router.match_route(test['method'], test['path']) {
 			restful_success++
 			println('  ✅ ${test['method']} ${test['path']} - ${test['description']}')
 		} else {
diff --git a/tests/test_dynamic_routes_real_world_simple.v b/tests/test_dynamic_routes_real_world_simple.v
index cb2395e..8ecd7aa 100644
--- a/tests/test_dynamic_routes_real_world_simple.v
+++ b/tests/test_dynamic_routes_real_world_simple.v
@@ -400,7 +400,7 @@ fn test_comprehensive_performance() {
 		mut complex_matches := 0
 		
 		for _ in 0 .. test_iterations {
-			if match_result := app.fast_router.match_route('GET', test['path']) {
+			if _ := app.fast_router.match_route('GET', test['path']) {
 				complex_matches++
 			}
 		}
diff --git a/tests/test_error_handling.v b/tests/test_error_handling.v
index c8fa8e0..d98b0ad 100644
--- a/tests/test_error_handling.v
+++ b/tests/test_error_handling.v
@@ -1,6 +1,5 @@
 import hono
 import net.http
-import json
 
 fn main() {
 	println('=== 统一错误处理系统测试 ===')
diff --git a/tests/test_integration_comprehensive.v b/tests/test_integration_comprehensive.v
index fcc18eb..e370937 100644
--- a/tests/test_integration_comprehensive.v
+++ b/tests/test_integration_comprehensive.v
@@ -338,7 +338,7 @@ fn test_memory_management_integration() {
 	// 测试缓存操作
 	cache.put('test_key', test_data)
 	
-	if cached := cache.get('test_key') {
+	if _ := cache.get('test_key') {
 		println('  ✅ 缓存存储和获取正常')
 	} else {
 		println('  ❌ 缓存存储或获取失败')
diff --git a/tests/test_migration_complete.v b/tests/test_migration_complete.v
index 6940031..216e737 100644
--- a/tests/test_migration_complete.v
+++ b/tests/test_migration_complete.v
@@ -198,7 +198,7 @@ fn test_backward_compatibility() {
 	mut router := hono.FastRouter.new()
 	
 	// 测试原有接口是否保持兼容
-	compatibility_tests := [
+	_ := [
 		'add_route() 接口',
 		'match_route() 接口',
 		'get_stats() 接口',
@@ -264,7 +264,7 @@ fn test_new_features() {
 	mut router := hono.FastRouter.new_with_cache_size(50)
 	
 	// 新功能清单
-	new_features := [
+	_ := [
 		'LRU 缓存机制',
 		'TTL 过期管理',
 		'健康状态检查',
diff --git a/tests/test_regex_cache_performance.v b/tests/test_regex_cache_performance.v
index 745b528..623928c 100644
--- a/tests/test_regex_cache_performance.v
+++ b/tests/test_regex_cache_performance.v
@@ -74,7 +74,7 @@ fn test_large_scale_repeated_matching() {
 	}
 	
 	// 验证缓存没有增长（说明使用了缓存）
-	regex_total_after, regex_compiled_after := router.get_regex_cache_stats()
+	_, regex_compiled_after := router.get_regex_cache_stats()
 	if regex_compiled_after == regex_compiled {
 		println('  ✅ 缓存使用正常 - 没有额外的编译')
 	} else {
@@ -178,7 +178,7 @@ fn test_multi_route_cache_effect() {
 	}
 	
 	// 验证缓存状态
-	regex_total_final, regex_compiled_final := router.get_regex_cache_stats()
+	_, regex_compiled_final := router.get_regex_cache_stats()
 	if regex_compiled_final == regex_compiled_after_first {
 		println('  ✅ 缓存工作正常 - 没有额外编译')
 	} else {
diff --git a/tests/test_regex_cache_verification.v b/tests/test_regex_cache_verification.v
index 0341287..81692e9 100644
--- a/tests/test_regex_cache_verification.v
+++ b/tests/test_regex_cache_verification.v
@@ -153,7 +153,7 @@ fn test_cache_hit_rate() {
 	}
 	
 	// 最终缓存状态
-	regex_total_final, regex_compiled_final := router.get_regex_cache_stats()
+	_, regex_compiled_final := router.get_regex_cache_stats()
 	
 	if regex_compiled_final == regex_compiled_after_first {
 		println('  ✅ 缓存命中率100% - 没有额外的编译')
diff --git a/tests/test_router_deep_profiling.v b/tests/test_router_deep_profiling.v
index 537dbce..1e1a936 100644
--- a/tests/test_router_deep_profiling.v
+++ b/tests/test_router_deep_profiling.v
@@ -87,7 +87,7 @@ fn test_step_by_step_breakdown() {
 	
 	// 步骤4: 正则表达式缓存检查
 	start_time4 := time.now()
-	cached_regex := router.regex_cache[route_path]
+	_ := router.regex_cache[route_path]
 	step4_time := time.since(start_time4)
 	println('    步骤4 - 正则缓存检查: ${step4_time}')
 	
diff --git a/tests/test_router_performance_comparison.v b/tests/test_router_performance_comparison.v
index 43257f2..dec3eea 100644
--- a/tests/test_router_performance_comparison.v
+++ b/tests/test_router_performance_comparison.v
@@ -57,7 +57,7 @@ fn (router NoCacheRouter) match_route_no_cache(method string, path string) ?hono
 			replaced_path = replaced_path.replace('{', r'\{')
 			replaced_path = replaced_path.replace('}', r'\}')
 			replaced_path = replaced_path.replace('^', r'\^')
-			replaced_path = replaced_path.replace('$', r'\$')
+			replaced_path = replaced_path.replace(r'$', r'\$')
 			replaced_path = replaced_path.replace('|', r'\|')
 			
 			// 提取参数名并替换为命名捕获组
@@ -68,7 +68,7 @@ fn (router NoCacheRouter) match_route_no_cache(method string, path string) ?hono
 				return '(?P<${param_name}>[^/]+)'
 			})
 			
-			replaced_path = '^${replaced_path}$'
+			replaced_path = '^${replaced_path}' + r'$'
 			
 			// 每次都重新编译正则表达式（这是性能瓶颈）
 			mut reg := regex.regex_opt(replaced_path) or { continue }
@@ -384,4 +384,4 @@ fn test_cache_hit_rate() {
 	
 	// 显示性能分析
 	router.analyze_router_performance()
-}
\ No newline at end of file
+}
diff --git a/tests/test_router_performance_profiling.v b/tests/test_router_performance_profiling.v
index 7da7453..9df0ea9 100644
--- a/tests/test_router_performance_profiling.v
+++ b/tests/test_router_performance_profiling.v
@@ -48,7 +48,7 @@ fn test_step_by_step_performance() {
 	
 	// 步骤3: 第二次匹配（使用缓存）
 	start_time3 := time.now()
-	result2 := router.match_route('GET', test_path)
+	_ = router.match_route('GET', test_path)
 	second_match_time := time.since(start_time3)
 	println('  第二次匹配时间 (使用缓存): ${second_match_time}')
 	
@@ -58,31 +58,49 @@ fn test_step_by_step_performance() {
 	println('  路由缓存: ${cache_size}/${cache_capacity}')
 	println('  正则缓存: ${regex_compiled}/${regex_total}')
 	
-	// 步骤5: 测试纯正则匹配时间
+	// 步骤5: 测试纯正则匹配时间（安全访问）
 	if cached := router.regex_cache[route_path] {
 		if cached.compiled {
-			start_time4 := time.now()
-			for _ in 0 .. 1000 {
-				cached.regex.matches_string(test_path)
+			// 先验证正则能匹配
+			if cached.regex.matches_string(test_path) {
+				start_time4 := time.now()
+				for _ in 0 .. 1000 {
+					cached.regex.matches_string(test_path)
+				}
+				pure_regex_time := time.since(start_time4)
+				avg_regex_time := f64(pure_regex_time.microseconds()) / 1000.0
+				println('  纯正则匹配平均时间: ${avg_regex_time:.3f}μs')
+			} else {
+				println('  ⚠️  正则表达式无法匹配测试路径')
 			}
-			pure_regex_time := time.since(start_time4)
-			avg_regex_time := f64(pure_regex_time.microseconds()) / 1000.0
-			println('  纯正则匹配平均时间: ${avg_regex_time:.3f}μs')
 		}
+	} else {
+		println('  ⚠️  正则缓存中未找到路由')
 	}
 	
-	// 步骤6: 测试参数提取时间
+	// 步骤6: 测试参数提取时间（安全访问）
 	if cached := router.regex_cache[route_path] {
-		if cached.compiled {
-			start_time5 := time.now()
-			for _ in 0 .. 1000 {
-				for param_name in cached.param_names {
-					cached.regex.get_group_by_name(test_path, param_name)
+		if cached.compiled && cached.param_names.len > 0 {
+			// 先执行一次匹配确保正则状态正确
+			if cached.regex.matches_string(test_path) {
+				start_time5 := time.now()
+				mut extract_count := 0
+				for _ in 0 .. 1000 {
+					// 每次提取前重新匹配
+					if cached.regex.matches_string(test_path) {
+						for param_name in cached.param_names {
+							group := cached.regex.get_group_by_name(test_path, param_name)
+							if group.len > 0 {
+								extract_count++
+							}
+						}
+					}
 				}
+				param_extract_time := time.since(start_time5)
+				avg_param_time := f64(param_extract_time.microseconds()) / 1000.0
+				println('  参数提取平均时间: ${avg_param_time:.3f}μs')
+				println('  参数数量: ${cached.param_names.len}')
 			}
-			param_extract_time := time.since(start_time5)
-			avg_param_time := f64(param_extract_time.microseconds()) / 1000.0
-			println('  参数提取平均时间: ${avg_param_time:.3f}μs')
 		}
 	}
 }
@@ -202,4 +220,4 @@ fn test_complexity_performance() {
 	for i, path in dynamic_paths {
 		println('      ${i+1}. ${path}')
 	}
-}
\ No newline at end of file
+}
diff --git a/tests/test_simple_fast_router.v b/tests/test_simple_fast_router.v
index 3857eb2..8a72746 100644
--- a/tests/test_simple_fast_router.v
+++ b/tests/test_simple_fast_router.v
@@ -49,7 +49,7 @@ fn test_basic_performance() {
 	mut fast_matches := 0
 	for _ in 0 .. iterations {
 		fast_router.clear_cache()
-		if match_result := fast_router.match_route('GET', test_path) {
+		if _ := fast_router.match_route('GET', test_path) {
 			fast_matches++
 		}
 	}
@@ -64,7 +64,7 @@ fn test_basic_performance() {
 	for _ in 0 .. iterations {
 		hybrid_router.clear_cache()
 		hybrid_router.clear_regex_cache()
-		if match_result := hybrid_router.match_route('GET', test_path) {
+		if _ := hybrid_router.match_route('GET', test_path) {
 			hybrid_matches++
 		}
 	}
@@ -93,7 +93,7 @@ fn test_basic_performance() {
 	start_time3 := time.now()
 	mut fast_cache_matches := 0
 	for _ in 0 .. iterations {
-		if match_result := fast_router.match_route('GET', test_path) {
+		if _ := fast_router.match_route('GET', test_path) {
 			fast_cache_matches++
 		}
 	}
@@ -102,7 +102,7 @@ fn test_basic_performance() {
 	start_time4 := time.now()
 	mut hybrid_cache_matches := 0
 	for _ in 0 .. iterations {
-		if match_result := hybrid_router.match_route('GET', test_path) {
+		if _ := hybrid_router.match_route('GET', test_path) {
 			hybrid_cache_matches++
 		}
 	}
diff --git a/tests/test_string_optimization.v b/tests/test_string_optimization.v
index 480652a..0b6033f 100644
--- a/tests/test_string_optimization.v
+++ b/tests/test_string_optimization.v
@@ -1,6 +1,3 @@
-import hono
-import net.http
-import os
 import time
 import strings
 
@@ -32,14 +29,14 @@ fn test_json_building() {
 	
 	// 方法1: 使用字符串插值（优化后）
 	start_time := time.now()
-	for i in 0 .. 10000 {
+	for _ in 0 .. 10000 {
 		_ := '{"message": "测试", "params": {"action": "${test_data['action']}", "id": "${test_data['id']}"}}'
 	}
 	interpolation_time := time.since(start_time)
 	
 	// 方法2: 使用StringBuilder（复杂场景）
 	start_time2 := time.now()
-	for i in 0 .. 10000 {
+	for _ in 0 .. 10000 {
 		mut builder := strings.new_builder(256)
 		builder.write_string('{"message": "测试", "params": {"action": "')
 		builder.write_string(test_data['action'])
diff --git a/upload.v b/upload.v
index 3172cdf..08dfc72 100644
--- a/upload.v
+++ b/upload.v
@@ -3,7 +3,7 @@ module hono
 import net.http
 import os
 import crypto.md5
-import json
+import x.json2
 import time
 
 // 分片上传配置
@@ -291,7 +291,7 @@ pub fn (manager ChunkUploadManager) get_upload_status(mut ctx Context) http.Resp
 		return ctx.resource_not_found('upload', file_hash)
 	}
 	
-	return ctx.json(json.encode(upload_status))
+	return ctx.json(json2.encode[FileUploadStatus](upload_status))
 }
 
 // 更新上传状态