feat(ui): pretty JSON rendering tool outputs (#9767)

Co-authored-by: Bryan Morgan <bryanmorgan@google.com>

packages/cli/src/utils/jsonoutput.ts

@@ -0,0 +1,46 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import stripAnsi from 'strip-ansi';
+
+export function checkInput(input: string | null | undefined): boolean {
+  if (input === null || input === undefined) {
+    return false;
+  }
+
+  const trimmed = input.trim();
+  if (!trimmed) {
+    return false;
+  }
+
+  if (!/^(?:\[|\{)/.test(trimmed)) {
+    return false;
+  }
+
+  if (stripAnsi(trimmed) !== trimmed) return false;
+
+  return true;
+}
+
+export function tryParseJSON(input: string): object | null {
+  if (!checkInput(input)) return null;
+  const trimmed = input.trim();
+  try {
+    const parsed = JSON.parse(trimmed);
+    if (parsed === null || typeof parsed !== 'object') {
+      return null;
+    }
+    if (Array.isArray(parsed) && parsed.length === 0) {
+      return null;
+    }
+
+    if (!Array.isArray(parsed) && Object.keys(parsed).length === 0) return null;
+
+    return parsed;
+  } catch (_err) {
+    return null;
+  }
+}