Am I Blocking JavaScript
JavaScript
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If this page renders, JavaScript is enabled for this tab. Disabling JS globally prevents this tool from loading.
How to use
- If you can see this tool’s headline and Refresh button, JavaScript is running in this tab.
- Read the note in Details for limits of this check.
- To test another site, compare whether that site breaks while this page still works.
FAQ
Am I blocking JavaScript?
If this page rendered interactively, JavaScript is not fully disabled in your browser for this tab. A global “disable JavaScript” setting prevents this React app from loading at all — you would see a blank page or browser warning.
Why does one site break but this page works?
Extensions (NoScript, uBlock with script rules), corporate policy, or Content Security Policy on that site may block scripts there only. This tool only proves JS works here.
How do I enable JavaScript?
In Chrome: Settings → Privacy and security → Site settings → JavaScript → Allowed. Similar paths exist in Firefox, Safari, and Edge. Remove per-site blocks from the lock icon in the address bar.
Does NoScript count?
If NoScript allows this domain, this page runs. Other domains may still be blocked until you whitelist them in the extension.
What about JavaScript disabled in PDF or email?
Those are different environments. This tool applies to normal web browsing tabs only.
Is anything sent to a server for this check?
No special probe is needed — the page itself is the proof. Standard page assets load as with any tool on this site.
Introduction
Am I Blocking JavaScript answers a practical question: is JavaScript actually executing in this browser tab? If you see the headline “No — JavaScript is running” and this interactive UI, the answer is already yes — the tool is a client-side React page that cannot render without JS.
Confusion comes from sites that break while others work, or from security extensions that block scripts selectively. There is no single “JavaScript off” light in the menu bar — this page gives a clear baseline: your browser can run JS here, so problems elsewhere are likely site-specific or extension-specific.
What this check can and cannot prove
| Statement | True when |
|---|---|
| JS works in this tab | You see this tool loaded (headline, Refresh, Details) |
| JS disabled globally | This page would not load — blank or browser message |
| JS blocked on another site | Still possible — per-site rules, CSP, or extensions |
| Third-party scripts blocked | Possible — main page JS may still run |
How browsers disable JavaScript
- Global setting — all sites lose scripts until re-enabled.
- Per-site permission — lock icon → permissions → JavaScript.
- Extensions — allowlist/blocklist per domain.
- Enterprise policy — managed browsers may lock JS off for some profiles.
Common use cases
- “Website doesn’t work” — confirm JS isn’t globally off before blaming the site.
- After security hardening — verify you did not break all sites with one toggle.
- Support — ask users to open this link; if it loads, escalate to site-specific blocking.
- Compare with cookies — login issues may be am I blocking cookies instead.
Best practices
- If this page works but another fails, check extensions and the other site’s lock icon permissions.
- Re-enable JavaScript for trusted sites rather than globally on forever unless you accept broken modern web apps.
- Developers: remember users with JS disabled are rare but non-zero — progressive enhancement still matters for content sites.
- For environment details, open device info or what browser am I using.