diff --git a/.taplo.toml b/.taplo.toml
new file mode 100644
index 00000000..2e097335
--- /dev/null
+++ b/.taplo.toml
@@ -0,0 +1,9 @@
+# Taplo configuration
+# https://taplo.tamasfe.dev/configuration/formatter-options.html
+
+[formatting]
+align_comments = false
+allowed_blank_lines = 1
+array_auto_collapse = false
+array_auto_expand = false
+indent_string = "    "
diff --git a/tools/tidy.sh b/tools/tidy.sh
index 383cb3fd..0e1bbbe8 100755
--- a/tools/tidy.sh
+++ b/tools/tidy.sh
@@ -238,6 +238,21 @@ if [[ -n "$(git ls-files '*.yaml')" ]]; then
     git ls-files '*.yaml'
 fi
 
+# TOML (if exists)
+if [[ -n "$(git ls-files '*.toml')" ]]; then
+    info "checking TOML style"
+    if [[ ! -e .taplo.toml ]]; then
+        warn "could not found .taplo.toml in the repository root"
+    fi
+    if type -P npm &>/dev/null; then
+        echo "+ npx -y @taplo/cli fmt \$(git ls-files '*.toml')"
+        npx -y @taplo/cli fmt $(git ls-files '*.toml')
+        check_diff $(git ls-files '*.toml')
+    else
+        warn "'npm' is not installed; skipped TOML style check"
+    fi
+fi
+
 # Markdown (if exists)
 if [[ -n "$(git ls-files '*.md')" ]]; then
     info "checking Markdown style"