diff --git a/humatest/humatest.go b/humatest/humatest.go
index fde3ba27..85debeb0 100644
--- a/humatest/humatest.go
+++ b/humatest/humatest.go
@@ -345,7 +345,10 @@ func dumpBody(body io.ReadCloser, buf *bytes.Buffer) (io.ReadCloser, error) {
 	}
 	body.Close()
 	if strings.Contains(buf.String(), "json") {
-		json.Indent(buf, b, "", "  ")
+		if err := json.Indent(buf, b, "", "  "); err != nil {
+			// Indent failed, so just write the buffer.
+			buf.Write(b)
+		}
 	} else {
 		buf.Write(b)
 	}
diff --git a/humatest/humatest_test.go b/humatest/humatest_test.go
index 27b57b23..07caef08 100644
--- a/humatest/humatest_test.go
+++ b/humatest/humatest_test.go
@@ -151,7 +151,7 @@ func TestNewAPI(t *testing.T) {
 }
 
 func TestDumpBodyError(t *testing.T) {
-	req, _ := http.NewRequest(http.MethodGet, "http://example.com/foo?bar=baz", nil)
+	req := httptest.NewRequest(http.MethodGet, "http://example.com/foo?bar=baz", nil)
 	req.Header.Set("Foo", "bar")
 	req.Host = "example.com"
 	req.Body = io.NopCloser(iotest.ErrReader(io.ErrUnexpectedEOF))
@@ -165,6 +165,17 @@ func TestDumpBodyError(t *testing.T) {
 	require.Error(t, err)
 }
 
+func TestDumpBodyInvalidJSON(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "http://example.com/foo?bar=baz", nil)
+	req.Header.Set("Content-Type", "application/json")
+	req.Host = "example.com"
+	req.Body = io.NopCloser(strings.NewReader("invalid json"))
+
+	b, err := DumpRequest(req)
+	require.NoError(t, err)
+	assert.Contains(t, string(b), "invalid json")
+}
+
 func TestOpenAPIRequired(t *testing.T) {
 	assert.PanicsWithValue(t, "custom huma.Config structs must specify a value for OpenAPI", func() {
 		New(t, huma.Config{})