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.

FreeDailyPro
AIDevHub.io
AIFreeTools.co
TinyPNG
Canva
Squoosh
AiFreeTools.com
Free online toolkit with 39+ tools including AI translator, speech-to-text. Invoice generator, QR codes, JSON formatter, image compressor, SEO tools, and more. No signup required.

Which is more popular?
Based on our record, Javascript Validator seems to be more popular. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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JV
Javascript Validator
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|---|---|---|
| Website | beautifytools.com | freedevkit.com |
| Company | — | Startup from the United States · 1 - 9 employees · 2026 |
| Listed in |
What each product offers, as listed by its team.

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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 FreeDevKit. 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
Tracking FreeDevKit since Mar 2026.
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JSLint is a JavaScript program that looks for problems in JavaScript programs.
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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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