CodeFactor.io
JSLint
Codacy
ESLint
Coala
textlint
Prettier
Online Javascript Validator validates javascript code and find errors and warnings that can be fixed. See real time validation of your javascript code as you type.

HTML Stripper
Puritext
Clean Text
Text Filter (by Musetips)
Text Cleaner
SnapTest
HTMLAsText
Lets you clean up your HTML / CSS / Javascript code so its more concisely formatted
Which is more popular?
Based on our record, Javascript Validator should be more popular than HTML-Cleaner.com. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | beautifytools.com | html-cleaner.com |
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Javascript Validator and HTML-Cleaner.com. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Try pasting your code into a validator to see if you don't have a typo somewhere: https://beautifytools.com/javascript-validator.php. Source: over 4 years ago
So everything works fine the way I see it and that error only comes up after a few clicks. Since I'm not a js wizard I did put your script code into a javascript validator and it looks like you're missing a couple of semi colons here and... Source: almost 5 years ago
You could find more effective and easy-to-use tools and many options on this website that help a lot for developers check this link. - Source: dev.to / about 2 years ago
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JSLint is a JavaScript program that looks for problems in JavaScript programs.
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Puritext is an online tool that cleans, reformats, and rewrites messy text from Word, email or websites. Export your cleaned text in plain, HTML, Markdown, email or CMS formats – instantly and effortlessly.
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Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
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Clean Text for iOS is a tool to reduce text cleanup time.
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