Google says it has begun requiring users to turn on JavaScript in order to use Google Search, possibly in an effort to block certain SEO tools.

Google says, from an SEO perspective, there’s no need to worry about using JavaScript when building websites.

Google still recommends you avoid using JavaScript for canonical tags but if you must, Google provided these recommendations.

Google's Gary Illyes said that Google Search can process JavaScript redirects but Google still does not recommend using JavaScript redirects because other search engines might not pick up on it.