Runs JavaScript inside the disposable workspace Worker — the same 5-second, DOM-free sandbox every tool uses — and captures the console: log/info/warn/error with printf-style formatting, dir, table (rendered as a text grid), group, count, time/timeEnd and assert, with a value inspector for objects, Maps, Sets, typed arrays, classes, errors and circular references. Code runs in strict mode with top-level await; the completion value of a bare final expression is shown. ES-module syntax is supported: imports are rewritten to dynamic imports and limited to the CSP-allowed CDN hosts (cdn.jsdelivr.net, cdn.lancar.id); exports are reported. Worker-only globals (self, postMessage, importScripts) are shadowed and network is off unless you allow it. Snippets are listed in the secondary output.