1 files changed, 9 insertions, 0 deletions
diff --git a/packages/markdown/remark/src/frontmatter.ts b/packages/markdown/remark/src/frontmatter.ts
new file mode 100644
index 000000000..d8828a6fe
--- /dev/null
+++ b/packages/markdown/remark/src/frontmatter.ts
@@ -0,0 +1,9 @@
+export function isFrontmatterValid(frontmatter: Record<string, any>) {
+	try {
+		// ensure frontmatter is JSON-serializable
+		JSON.stringify(frontmatter);
+	} catch {
+		return false;
+	}
+	return typeof frontmatter === 'object' && frontmatter !== null;
+}