diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index bf2f3dbf..8ad81394 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -28,7 +28,7 @@ jobs:
     runs-on: macos-latest
     steps:
     - name: depends
-      run: brew update && brew install fmt poco spdlog nlohmann-json
+      run: brew update && brew install fmt poco spdlog
     - name: checkout
       uses: actions/checkout@v4
     - name: build
@@ -57,7 +57,6 @@ jobs:
           mingw-w64-x86_64-gcc
           mingw-w64-x86_64-spdlog
           mingw-w64-x86_64-poco
-          mingw-w64-x86_64-nlohmann-json
     - name: checkout
       uses: actions/checkout@v4
     - name: cache
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 9a9d54cd..379d695f 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -61,7 +61,6 @@ jobs:
           mingw-w64-x86_64-gcc
           mingw-w64-x86_64-spdlog
           mingw-w64-x86_64-poco
-          mingw-w64-x86_64-nlohmann-json
     - name: checkout
       uses: actions/checkout@v4
     - name: cache
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c76ea77b..0f7d9053 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,12 +91,6 @@ else()
     find_package(Poco REQUIRED COMPONENTS Foundation XML JSON Net NetSSL)
 endif()
 
-if (${CANDY_STATIC_NLOHMANN_JSON})
-    Fetch(nlohmann_json "https://github.com/nlohmann/json.git" "v3.11.3")
-else()
-    find_package(nlohmann_json REQUIRED)
-endif()
-
 add_subdirectory(candy)
 add_subdirectory(candy-cli)
 add_subdirectory(candy-service)
diff --git a/candy-cli/CMakeLists.txt b/candy-cli/CMakeLists.txt
index af17a791..4e09471a 100644
--- a/candy-cli/CMakeLists.txt
+++ b/candy-cli/CMakeLists.txt
@@ -9,8 +9,7 @@ target_include_directories(candy-cli PUBLIC
 set_target_properties(candy-cli PROPERTIES OUTPUT_NAME "candy")
 
 target_link_libraries(candy-cli PRIVATE spdlog::spdlog)
-target_link_libraries(candy-cli PRIVATE Poco::Foundation)
-target_link_libraries(candy-cli PRIVATE nlohmann_json::nlohmann_json)
+target_link_libraries(candy-cli PRIVATE Poco::Foundation Poco::JSON)
 target_link_libraries(candy-cli PRIVATE Candy::Library)
 
 install(TARGETS candy-cli)
diff --git a/candy-cli/src/config.cc b/candy-cli/src/config.cc
index 1c93025e..959e6a18 100644
--- a/candy-cli/src/config.cc
+++ b/candy-cli/src/config.cc
@@ -2,6 +2,7 @@
 #include "config.h"
 #include "argparse.h"
 #include "candy/candy.h"
+#include <Poco/JSON/Object.h>
 #include <Poco/Platform.h>
 #include <Poco/String.h>
 #include <filesystem>
@@ -9,29 +10,34 @@
 #include <functional>
 #include <iostream>
 #include <map>
-#include <nlohmann/json.hpp>
 #include <spdlog/spdlog.h>
 #include <sstream>
 #include <string>
 
-nlohmann::json arguments::json() {
-    nlohmann::json config = {
-        {"mode", this->mode},
-        {"websocket", this->websocket},
-        {"password", this->password},
-        {"dhcp", this->dhcp},
-        {"sdwan", this->sdwan},
-        {"name", this->name},
-        {"tun", this->tun},
-        {"stun", this->stun},
-        {"localhost", this->localhost},
-        {"discovery", this->discovery},
-        {"route", this->routeCost},
-        {"mtu", this->mtu},
-        {"port", this->port},
-        {"vmac", virtualMac(this->name)},
-        {"expt", loadTunAddress(this->name)},
-    };
+Poco::JSON::Object arguments::json() {
+    Poco::JSON::Object config;
+    config.set("mode", this->mode);
+    config.set("websocket", this->websocket);
+    config.set("password", this->password);
+
+    if (this->mode == "client") {
+        config.set("name", this->name);
+        config.set("tun", this->tun);
+        config.set("stun", this->stun);
+        config.set("localhost", this->localhost);
+        config.set("discovery", this->discovery);
+        config.set("route", this->routeCost);
+        config.set("mtu", this->mtu);
+        config.set("port", this->port);
+        config.set("vmac", virtualMac(this->name));
+        config.set("expt", loadTunAddress(this->name));
+    }
+
+    if (this->mode == "server") {
+        config.set("dhcp", this->dhcp);
+        config.set("sdwan", this->sdwan);
+    }
+
     return config;
 }
 
diff --git a/candy-cli/src/config.h b/candy-cli/src/config.h
index a023b45b..dbd5e5b6 100644
--- a/candy-cli/src/config.h
+++ b/candy-cli/src/config.h
@@ -2,13 +2,13 @@
 #ifndef CANDY_CLI_CONFIG_H
 #define CANDY_CLI_CONFIG_H
 
+#include <Poco/JSON/Object.h>
 #include <map>
-#include <nlohmann/json.hpp>
 #include <string>
 
 struct arguments {
     int parse(int argc, char *argv[]);
-    nlohmann::json json();
+    Poco::JSON::Object json();
 
 private:
     void parseFile(std::string cfgFile);
diff --git a/candy-cli/src/main.cc b/candy-cli/src/main.cc
index 12a57474..4e94df00 100644
--- a/candy-cli/src/main.cc
+++ b/candy-cli/src/main.cc
@@ -6,10 +6,9 @@
 int main(int argc, char *argv[]) {
     arguments args;
     args.parse(argc, argv);
-
     auto config = args.json();
 
-    if (config["mode"] == "client") {
+    if (config.getValue<std::string>("mode") == "client") {
         static const std::string id = "cli";
 
         auto handler = [](int) -> void { candy::client::shutdown(id); };
@@ -21,14 +20,11 @@ int main(int argc, char *argv[]) {
             while (true) {
                 std::this_thread::sleep_for(std::chrono::seconds(1));
                 auto status = candy::client::status(id);
-                if (status) {
-                    auto it = (*status).find("address");
-                    if (it != (*status).end() && it->is_string()) {
-                        auto address = it->get<std::string>();
-                        if (!address.empty()) {
-                            saveTunAddress(config["name"], address);
-                            break;
-                        }
+                if (status && (*status).has("address")) {
+                    std::string address = (*status).getValue<std::string>("address");
+                    if (!address.empty()) {
+                        saveTunAddress(config.getValue<std::string>("name"), address);
+                        break;
                     }
                 }
             }
@@ -38,7 +34,7 @@ int main(int argc, char *argv[]) {
         return 0;
     }
 
-    if (config["mode"] == "server") {
+    if (config.getValue<std::string>("mode") == "server") {
         auto handler = [](int) -> void { candy::server::shutdown(); };
 
         signal(SIGINT, handler);
diff --git a/candy-service/CMakeLists.txt b/candy-service/CMakeLists.txt
index d927e184..9ed60f0e 100644
--- a/candy-service/CMakeLists.txt
+++ b/candy-service/CMakeLists.txt
@@ -9,8 +9,7 @@ target_include_directories(candy-service PUBLIC
 set_target_properties(candy-service PROPERTIES OUTPUT_NAME "candy-service")
 
 target_link_libraries(candy-service PRIVATE spdlog::spdlog)
-target_link_libraries(candy-service PRIVATE Poco::Foundation)
-target_link_libraries(candy-service PRIVATE nlohmann_json::nlohmann_json)
+target_link_libraries(candy-service PRIVATE Poco::Foundation Poco::JSON)
 target_link_libraries(candy-service PRIVATE Candy::Library)
 
 install(TARGETS candy-service)
diff --git a/candy/CMakeLists.txt b/candy/CMakeLists.txt
index f0d819b9..9df7f1c2 100644
--- a/candy/CMakeLists.txt
+++ b/candy/CMakeLists.txt
@@ -16,8 +16,7 @@ else()
 endif()
 
 target_link_libraries(candy-library PRIVATE spdlog::spdlog)
-target_link_libraries(candy-library PRIVATE Poco::Foundation Poco::Net Poco::NetSSL)
-target_link_libraries(candy-library PRIVATE nlohmann_json::nlohmann_json)
+target_link_libraries(candy-library PRIVATE Poco::Foundation Poco::JSON Poco::Net Poco::NetSSL)
 
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
diff --git a/candy/include/candy/client.h b/candy/include/candy/client.h
index 41718924..c112c631 100644
--- a/candy/include/candy/client.h
+++ b/candy/include/candy/client.h
@@ -2,16 +2,16 @@
 #ifndef CANDY_CLIENT_H
 #define CANDY_CLIENT_H
 
-#include <nlohmann/json.hpp>
+#include <Poco/JSON/Object.h>
 #include <optional>
 #include <string>
 
 namespace candy {
 namespace client {
 
-bool run(const std::string &id, const nlohmann::json &config);
+bool run(const std::string &id, const Poco::JSON::Object &config);
 bool shutdown(const std::string &id);
-std::optional<nlohmann::json> status(const std::string &id);
+std::optional<Poco::JSON::Object> status(const std::string &id);
 
 } // namespace client
 } // namespace candy
diff --git a/candy/include/candy/server.h b/candy/include/candy/server.h
index f7c36948..1f4fadb3 100644
--- a/candy/include/candy/server.h
+++ b/candy/include/candy/server.h
@@ -2,13 +2,13 @@
 #ifndef CANDY_SERVER_H
 #define CANDY_SERVER_H
 
-#include <nlohmann/json.hpp>
+#include <Poco/JSON/Object.h>
 #include <string>
 
 namespace candy {
 namespace server {
 
-bool run(const nlohmann::json &config);
+bool run(const Poco::JSON::Object &config);
 bool shutdown();
 
 } // namespace server
diff --git a/candy/src/candy/client.cc b/candy/src/candy/client.cc
index 8111ebd8..c2a1e647 100644
--- a/candy/src/candy/client.cc
+++ b/candy/src/candy/client.cc
@@ -2,10 +2,11 @@
 #include "candy/client.h"
 #include "core/client.h"
 #include "utils/atomic.h"
+#include <Poco/JSON/Object.h>
+#include <Poco/JSON/Stringifier.h>
 #include <map>
 #include <memory>
 #include <mutex>
-#include <nlohmann/json.hpp>
 #include <optional>
 #include <shared_mutex>
 #include <spdlog/spdlog.h>
@@ -29,10 +30,10 @@ class Instance {
         }
     }
 
-    nlohmann::json status() {
-        nlohmann::json data;
+    Poco::JSON::Object status() {
+        Poco::JSON::Object data;
         if (auto client = this->client.lock()) {
-            data["address"] = client->getTunCidr();
+            data.set("address", client->getTunCidr());
         }
         return data;
     }
@@ -70,27 +71,33 @@ bool try_erase_instance(const std::string &id) {
 
 } // namespace
 
-bool run(const std::string &id, const nlohmann::json &config) {
+bool run(const std::string &id, const Poco::JSON::Object &config) {
     auto instance = try_create_instance(id);
     if (!instance) {
         return false;
     }
 
-    spdlog::info("run enter: id={} config={}", id, config.dump(4));
+    auto toString = [](const Poco::JSON::Object &obj) -> std::string {
+        std::ostringstream oss;
+        Poco::JSON::Stringifier::stringify(obj, oss, 4);
+        return oss.str();
+    };
+
+    spdlog::info("run enter: id={} config={}", id, toString(config));
     while ((*instance)->is_running()) {
         std::this_thread::sleep_for(std::chrono::seconds(1));
         auto client = (*instance)->create_client();
-        client->setName(config["name"]);
-        client->setPassword(config["password"]);
-        client->setWebSocket(config["websocket"]);
-        client->setTunAddress(config["tun"]);
-        client->setVirtualMac(config["vmac"]);
-        client->setExptTunAddress(config["expt"]);
-        client->setStun(config["stun"]);
-        client->setDiscoveryInterval(config["discovery"]);
-        client->setRouteCost(config["route"]), client->setMtu(config["mtu"]);
-        client->setPort(config["port"]);
-        client->setLocalhost(config["localhost"]);
+        client->setName(config.getValue<std::string>("name"));
+        client->setPassword(config.getValue<std::string>("password"));
+        client->setWebSocket(config.getValue<std::string>("websocket"));
+        client->setTunAddress(config.getValue<std::string>("tun"));
+        client->setVirtualMac(config.getValue<std::string>("vmac"));
+        client->setExptTunAddress(config.getValue<std::string>("expt"));
+        client->setStun(config.getValue<std::string>("stun"));
+        client->setDiscoveryInterval(config.getValue<int>("discovery"));
+        client->setRouteCost(config.getValue<int>("route")), client->setMtu(config.getValue<int>("mtu"));
+        client->setPort(config.getValue<int>("port"));
+        client->setLocalhost(config.getValue<std::string>("localhost"));
         client->run();
     }
     spdlog::info("run exit: id={} ", id);
@@ -111,7 +118,7 @@ bool shutdown(const std::string &id) {
     return true;
 }
 
-std::optional<nlohmann::json> status(const std::string &id) {
+std::optional<Poco::JSON::Object> status(const std::string &id) {
     std::shared_lock lock(instance_mutex);
     auto it = instance_map.find(id);
     if (it != instance_map.end()) {
diff --git a/candy/src/candy/server.cc b/candy/src/candy/server.cc
index eacb5eb7..bdd83476 100644
--- a/candy/src/candy/server.cc
+++ b/candy/src/candy/server.cc
@@ -11,14 +11,14 @@ Utils::Atomic<bool> running(true);
 std::shared_ptr<Server> server;
 } // namespace
 
-bool run(const nlohmann::json &config) {
+bool run(const Poco::JSON::Object &config) {
     while (running.load()) {
         std::this_thread::sleep_for(std::chrono::seconds(1));
         server = std::make_shared<Server>();
-        server->setWebSocket(config["websocket"]);
-        server->setPassword(config["password"]);
-        server->setDHCP(config["dhcp"]);
-        server->setSdwan(config["sdwan"]);
+        server->setWebSocket(config.getValue<std::string>("websocket"));
+        server->setPassword(config.getValue<std::string>("password"));
+        server->setDHCP(config.getValue<std::string>("dhcp"));
+        server->setSdwan(config.getValue<std::string>("sdwan"));
         server->run();
     }
     return true;
diff --git a/dockerfile b/dockerfile
index 2c6a3e05..aea4ddd9 100644
--- a/dockerfile
+++ b/dockerfile
@@ -3,7 +3,7 @@ RUN apk update
 RUN apk add spdlog openssl poco
 
 FROM base AS build
-RUN apk add git cmake ninja pkgconf g++ spdlog-dev openssl-dev poco-dev nlohmann-json linux-headers
+RUN apk add git cmake ninja pkgconf g++ spdlog-dev openssl-dev poco-dev linux-headers
 COPY . candy
 RUN cd candy && cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release && cmake --build build && cmake --install build