JavaScript Check
verifiedFreejavascriptcheck.com
Free test page that checks whether a bot or user agent fetches and executes JavaScript/CSS and Web Bot Auth.
What it does
javascriptcheck.com is a free diagnostic page that tests whether a given user agent - browser, crawler or AI agent - fetches and executes JavaScript and CSS, and whether it presents a valid Web Bot Auth signature. It records results per session and publishes aggregated statistics by user agent.
Core features
Tests JS and CSS fetching and execution per session
Verifies Web Bot Auth cryptographic signatures
Per-user-agent aggregated reports
Unique per-session assets for accurate detection
Best for
→Checking whether a bot runs JavaScript
→Verifying Web Bot Auth support
→Auditing crawler and agent behavior
→Researching bot capabilities
Tutorials
Step-by-step: exactly how to get things done with it.