diff --git a/services/bundlemgr/BUILD.gn b/services/bundlemgr/BUILD.gn
index 8c854da0868eda7a9a4111da9bf47876c629a338..8c56e5898207e4562b8f18ff4731ba4a8f1aea7e 100644
--- a/services/bundlemgr/BUILD.gn
+++ b/services/bundlemgr/BUILD.gn
@@ -308,6 +308,7 @@ ohos_shared_library("libbms") {
     "access_token:libtokenid_sdk",
     "appspawn:appspawn_client",
     "appverify:libhapverify",
+    "cJSON:cjson",
     "common_event_service:cesfwk_innerkits",
     "eventhandler:libeventhandler",
     "ffrt:libffrt",
@@ -575,6 +576,7 @@ ohos_shared_library("installs") {
     "access_token:el5_filekey_manager_sdk",
     "appspawn:hnpapi",
     "bounds_checking_function:libsec_shared",
+    "cJSON:cjson",
     "eventhandler:libeventhandler",
     "ffrt:libffrt",
     "hilog:libhilog",
diff --git a/services/bundlemgr/src/ipc/code_signature_param.cpp b/services/bundlemgr/src/ipc/code_signature_param.cpp
index 23b964c6e450bf0f7ac150eabec7329c1daa5942..c84e8563036179ab9fa8b1a8eddccdd56aec8964 100644
--- a/services/bundlemgr/src/ipc/code_signature_param.cpp
+++ b/services/bundlemgr/src/ipc/code_signature_param.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Huawei Device Co., Ltd.
+ * Copyright (c) 2023-2025 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -16,7 +16,7 @@
 #include "ipc/code_signature_param.h"
 
 #include "bundle_constants.h"
-#include "nlohmann/json.hpp"
+#include "cJSON.h"
 #include "parcel_macro.h"
 #include "string_ex.h"
 
@@ -75,18 +75,22 @@ CodeSignatureParam *CodeSignatureParam::Unmarshalling(Parcel &parcel)
 
 std::string CodeSignatureParam::ToString() const
 {
-    nlohmann::json codeSignatureParamJson = nlohmann::json {
-        { CODE_SIGNATURE_MODULE_PATH, modulePath },
-        { CODE_SIGNATURE_CPU_ABI, cpuAbi },
-        { CODE_SIGNATURE_TARGET_SO_PATH, targetSoPath },
-        { CODE_SIGNATURE_SIGNATURE_FILE_PATH, signatureFileDir },
-        { CODE_SIGNATURE_IS_ENTERPRISE_BUNDLE, isEnterpriseBundle },
-        { CODE_SIGNATURE_APP_IDENTIFIER, appIdentifier },
-        { CODE_SIGNATURE_IS_PREINSTALLED_BUNDLE, isPreInstalledBundle },
-        { CODE_SIGNATURE_IS_COMPILE_SDK_OPENHARMONY, isCompileSdkOpenHarmony },
-        { CODE_SIGNATURE_IS_COMPRESS_NATIVE_LIBRARY, isCompressNativeLibrary },
-    };
-    return codeSignatureParamJson.dump(Constants::DUMP_INDENT);
+    cJSON *codeSignatureParamJson = cJSON_CreateObject();
+    cJSON_AddStringToObject(codeSignatureParamJson, CODE_SIGNATURE_MODULE_PATH, modulePath.c_str());
+    cJSON_AddStringToObject(codeSignatureParamJson, CODE_SIGNATURE_CPU_ABI, cpuAbi.c_str());
+    cJSON_AddStringToObject(codeSignatureParamJson, CODE_SIGNATURE_TARGET_SO_PATH, targetSoPath.c_str());
+    cJSON_AddStringToObject(codeSignatureParamJson, CODE_SIGNATURE_SIGNATURE_FILE_PATH, signatureFileDir.c_str());
+    cJSON_AddBoolToObject(codeSignatureParamJson, CODE_SIGNATURE_IS_ENTERPRISE_BUNDLE, isEnterpriseBundle);
+    cJSON_AddStringToObject(codeSignatureParamJson, CODE_SIGNATURE_APP_IDENTIFIER, appIdentifier.c_str());
+    cJSON_AddBoolToObject(codeSignatureParamJson, CODE_SIGNATURE_IS_PREINSTALLED_BUNDLE, isPreInstalledBundle);
+    cJSON_AddBoolToObject(codeSignatureParamJson, CODE_SIGNATURE_IS_COMPILE_SDK_OPENHARMONY, isCompileSdkOpenHarmony);
+    cJSON_AddBoolToObject(codeSignatureParamJson, CODE_SIGNATURE_IS_COMPRESS_NATIVE_LIBRARY, isCompressNativeLibrary);
+
+    char *jsonString = cJSON_Print(codeSignatureParamJson);
+    cJSON_Delete(codeSignatureParamJson);
+    std::string result(jsonString);
+    free(jsonString);
+    return result;
 }
 } // AppExecFwk
 } // OHOS
diff --git a/services/bundlemgr/test/unittest/bms_bundle_mgr_ext_test/BUILD.gn b/services/bundlemgr/test/unittest/bms_bundle_mgr_ext_test/BUILD.gn
index c2f5afb3d07ab3cb2178ed4bb4108c2e2156ce7d..f5256ee24eccdf2b068aa472713a5928acbc1035 100755
--- a/services/bundlemgr/test/unittest/bms_bundle_mgr_ext_test/BUILD.gn
+++ b/services/bundlemgr/test/unittest/bms_bundle_mgr_ext_test/BUILD.gn
@@ -1,4 +1,4 @@
-# Copyright (c) 2022-2023 Huawei Device Co., Ltd.
+# Copyright (c) 2022-2025 Huawei Device Co., Ltd.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
@@ -63,6 +63,7 @@ ohos_unittest("BmsBundleMgrExtTest") {
     "appspawn:hnpapi",
     "appverify:libhapverify",
     "bounds_checking_function:libsec_shared",
+    "cJSON:cjson",
     "common_event_service:cesfwk_innerkits",
     "eventhandler:libeventhandler",
     "ffrt:libffrt",
diff --git a/services/bundlemgr/test/unittest/bms_bundle_permission_grant_test/BUILD.gn b/services/bundlemgr/test/unittest/bms_bundle_permission_grant_test/BUILD.gn
index cb9b243898a156bb346b04ab2834cdccf4828892..3cecf75ee3c6133c57d8a3893d6c7b2e51bdd56b 100644
--- a/services/bundlemgr/test/unittest/bms_bundle_permission_grant_test/BUILD.gn
+++ b/services/bundlemgr/test/unittest/bms_bundle_permission_grant_test/BUILD.gn
@@ -281,6 +281,7 @@ ohos_unittest("BmsBundlePermissionGrantTest") {
     "appspawn:hnpapi",
     "appverify:libhapverify",
     "bounds_checking_function:libsec_shared",
+    "cJSON:cjson",
     "common_event_service:cesfwk_innerkits",
     "eventhandler:libeventhandler",
     "hilog:libhilog",
diff --git a/services/bundlemgr/test/unittest/bms_install_daemon_test/BUILD.gn b/services/bundlemgr/test/unittest/bms_install_daemon_test/BUILD.gn
index 95487f0bdd5a628b820907a44d56842e6b0fad38..ac9cef36e7b87aa9ca610c263d4229d40c18c137 100644
--- a/services/bundlemgr/test/unittest/bms_install_daemon_test/BUILD.gn
+++ b/services/bundlemgr/test/unittest/bms_install_daemon_test/BUILD.gn
@@ -295,6 +295,7 @@ ohos_unittest("BmsInstallDaemonOperatorTest") {
     "access_token:libtokenid_sdk",
     "appspawn:hnpapi",
     "bounds_checking_function:libsec_shared",
+    "cJSON:cjson",
     "c_utils:utils",
     "eventhandler:libeventhandler",
     "hilog:libhilog",
diff --git a/services/bundlemgr/test/unittest/bms_installd_client_test/BUILD.gn b/services/bundlemgr/test/unittest/bms_installd_client_test/BUILD.gn
index a74a2d24d165acb69ba3e6ded7843b6211798f0a..0c72ad0fedc4fd742eca3dc8ab58bd84e14754c2 100644
--- a/services/bundlemgr/test/unittest/bms_installd_client_test/BUILD.gn
+++ b/services/bundlemgr/test/unittest/bms_installd_client_test/BUILD.gn
@@ -43,6 +43,7 @@ ohos_unittest("BmsInstalldClientTest") {
     "access_token:libaccesstoken_sdk",
     "appspawn:hnpapi",
     "bounds_checking_function:libsec_shared",
+    "cJSON:cjson",
     "eventhandler:libeventhandler",
     "hilog:libhilog",
     "hitrace:hitrace_meter",