garrytan/gstack · error · Error

Cannot parse params as JSON: ${e.message} Cause: argument '$

Error message

Cannot parse params as JSON: ${e.message}
Cause: argument '${args[1]}' is not valid JSON.
Action: pass a JSON object literal, e.g. '{"backendNodeId":42}'.

What it means

Error "Cannot parse params as JSON: ${e.message} Cause: argument '${args[1]}' is not valid JSON. Action: pass a JSON object literal, e.g. '{"backendNodeId":42}'." thrown in garrytan/gstack.

Source

Thrown at browse/src/cdp-commands.ts:49

      'Usage: $B cdp <Domain.method> [json-params]',
      '',
      'Allowed methods are listed in browse/src/cdp-allowlist.ts. To add one,',
      'open a PR with a one-line justification and the (scope, output) tags.',
      'Examples:',
      '  $B cdp Accessibility.getFullAXTree {}',
      '  $B cdp Performance.getMetrics {}',
      '  $B cdp DOM.describeNode \'{"backendNodeId":42,"depth":3}\'',
    ].join('\n');
  }
  const qualified = args[0]!;
  const { domain, method } = parseQualified(qualified);
  // Optional second arg is JSON params; default to {}.
  let params: Record<string, unknown> = {};
  if (args[1]) {
    try {
      params = JSON.parse(args[1]) ?? {};
    } catch (e: any) {
      throw new Error(
        `Cannot parse params as JSON: ${e.message}\n` +
          `Cause: argument '${args[1]}' is not valid JSON.\n` +
          'Action: pass a JSON object literal, e.g. \'{"backendNodeId":42}\'.'
      );
    }
  }
  // Dispatch via the bridge (allowlist + mutex + timeout + finally-release).
  const tabId = bm.getActiveTabId();
  const { raw, entry } = await dispatchCdpCall({ domain, method, params, tabId, bm });
  const json = JSON.stringify(raw, null, 2);
  if (entry.output === 'untrusted') {
    return wrapUntrustedContent(json, `cdp:${qualified}`);
  }
  return json;
}

View on GitHub (pinned to 94993f7401)

When it happens

Trigger: Thrown at browse/src/cdp-commands.ts:49 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of garrytan/gstack@94993f7401 (2026-08-12). Data as JSON: /api/errors/e53d68bb5ca2abe9. Report an issue: GitHub.