diff --git a/.clang-format b/.clang-format
index 2a8066958..b7cf99793 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,4 +1,4 @@
 BasedOnStyle:  LLVM
 DerivePointerAlignment: false
 PointerAlignment: Left
-
+SpacesBeforeTrailingComments: 1
diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
new file mode 100644
index 000000000..5f078ff00
--- /dev/null
+++ b/.github/workflows/clang-format.yml
@@ -0,0 +1,19 @@
+name: clang-format check
+on: [push, pull_request]
+jobs:
+  formatting-check:
+    name: formatting check
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        path:
+          - 'src'
+          - 'examples'
+          - 'include'
+    steps:
+    - uses: actions/checkout@v4
+    - name: runs clang-format style check for C/C++/Protobuf programs.
+      uses: jidicula/clang-format-action@v4.13.0
+      with:
+        clang-format-version: '18'
+        check-path: ${{ matrix.path }}
diff --git a/src/test_lib_json/main.cpp b/src/test_lib_json/main.cpp
index a6f21c45a..1ef33bb5a 100644
--- a/src/test_lib_json/main.cpp
+++ b/src/test_lib_json/main.cpp
@@ -3632,12 +3632,12 @@ JSONTEST_FIXTURE_LOCAL(CharReaderAllowSpecialFloatsTest, issue209) {
   for (const auto& td : test_data) {
     bool ok = reader->parse(&*td.in.begin(), &*td.in.begin() + td.in.size(),
                             &root, &errs);
-    JSONTEST_ASSERT(td.ok == ok) << "line:" << td.line << "\n"
-                                 << "  expected: {"
-                                 << "ok:" << td.ok << ", in:\'" << td.in << "\'"
-                                 << "}\n"
-                                 << "  actual: {"
-                                 << "ok:" << ok << "}\n";
+    // clang-format off
+    JSONTEST_ASSERT(td.ok == ok) <<
+        "line:" << td.line << "\n  " <<
+        "expected: {ok:" << td.ok << ", in:\'" << td.in << "\'}\n " <<
+        "actual: {ok:" << ok << "}\n";
+    // clang-format on
   }
 
   {