What is NoibuJSBeautifier?

NoibuJSBeautifier is a bot in the accessibility checkers category, operated by Noibu.

Bot name
NoibuJSBeautifier
Operator
Noibu
Type
Bot
Respects robots.txt
Not confirmed
robots.txt user agent
Noibu
Signs requests (Web Bot Auth)
No

About NoibuJSBeautifier

Our microservice downloads js files from our users servers in order to format them and show them a human readable file. This is done to facilitate solving errors associated with said file

Accessibility checkers scan pages for WCAG issues on behalf of site owners and auditors. Allow the checkers you run and keep them out of analytics.

NoibuJSBeautifier user agent

NoibuJSBeautifier identifies itself with this user agent string:

  • Noibu JS Beautifier

Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.

How to block NoibuJSBeautifier in robots.txt

We have not confirmed whether NoibuJSBeautifier follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.

Block NoibuJSBeautifier from the whole site

User-agent: Noibu
Disallow: /

Block NoibuJSBeautifier from some folders

User-agent: Noibu
Disallow: /private/
Disallow: /search

Allow NoibuJSBeautifier only on some folders

User-agent: Noibu
Allow: /blog/
Disallow: /

Allow NoibuJSBeautifier and block other crawlers

User-agent: Noibu
Allow: /

User-agent: *
Disallow: /

Things to know

  • Each host needs its own file. Rules on www.example.com do not apply to shop.example.com.
  • A crawler obeys only the most specific group that names it. Once you add a User-agent: Noibu group, NoibuJSBeautifier ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take Noibu from NoibuJSBeautifier's user agent; check Noibu's own documentation if it publishes a different robots.txt name.
  • Crawlers cache robots.txt, so changes can take up to a day to apply. Disallow stops crawling but does not remove pages already collected or indexed.

Limits of robots.txt

  1. NoibuJSBeautifier may not follow the rule. robots.txt is a request that nothing enforces, and we have not confirmed that NoibuJSBeautifier follows it. Check your logs after adding a rule.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send NoibuJSBeautifier's user agent, and a scraper using it is not bound by Noibu's robots.txt policy. Only checking the source network tells a real NoibuJSBeautifier from a fake one.

Treat robots.txt as a statement of your policy, and enforce it where requests arrive.

Who should care about NoibuJSBeautifier

Publishers

Allow NoibuJSBeautifier if it is a service you use, and keep its visits out of page views and ad requests either way.

Transfon Security for publishers

Media buyers and advertisers

NoibuJSBeautifier is not a person. Exclude it from campaign and conversion data so reports reflect real visitors.

Transfon Security for advertisers

E-commerce

Allow NoibuJSBeautifier only if it works for your store, and keep it away from cart and checkout.

Transfon Security for e-commerce

SaaS and APIs

If NoibuJSBeautifier is a service you use, allow it on the endpoints it needs and block it elsewhere.

Transfon Security for SaaS and APIs

Block NoibuJSBeautifier with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows NoibuJSBeautifier by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.

Transfon Security

Control NoibuJSBeautifier on your site

  • See every NoibuJSBeautifier visit and the pages it reads
  • Spot bots that fake trusted crawler names
  • Block, allow or rate limit NoibuJSBeautifier with one rule
  • Works with or without robots.txt support

Frequently asked questions

What is NoibuJSBeautifier?

NoibuJSBeautifier is a bot in the accessibility checkers category, operated by Noibu. Our microservice downloads js files from our users servers in order to format them and show them a human readable file. This is done to facilitate solving errors associated with said file

Does NoibuJSBeautifier respect robots.txt?

We have not confirmed whether NoibuJSBeautifier follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.

How do I block NoibuJSBeautifier?

Add "User-agent: Noibu" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "Noibu" at your WAF. In Transfon Security that is one User Agent block rule.

Is robots.txt enough to block NoibuJSBeautifier?

No. robots.txt is voluntary, so NoibuJSBeautifier may not follow it, and anyone can send NoibuJSBeautifier's user agent, so a fake NoibuJSBeautifier ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.

Should I block NoibuJSBeautifier?

Accessibility checkers scan pages for WCAG issues on behalf of site owners and auditors. Allow the checkers you run and keep them out of analytics.

Related bots

All accessibility checkers · Full bot directory

See Which Bots Visit Your Site

Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.

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