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Code Beautify JSON Validator
FreeFormatter
CyberChef
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CodeBeautify
CodeSwissKnife
55 free formatters, converters, generators, and reference tools for developers — JSON, Base64, JWT, regex, hashes, subnets. Nothing you paste is ever uploaded.
CodeFactor.io
JSLint
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ESLint
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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.

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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Javascript Validator
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| Website | whitekit.dev | beautifytools.com |
| Pricing | — | |
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| Listed in |
In their own words, as submitted to SaaSHub.

WhiteKit brings together 55 developer tools in one place: formatters (JSON, XML, SQL, YAML), converters, security utilities (JWT, hashing, encoding), network calculators, and text tools. Everything runs 100% client-side. Your data never leaves your device, so you can safely paste API keys,...
No description of Javascript Validator yet.
What each product offers, as listed by its team.

No features have been listed yet.
How often each product is chosen within a category, 0–100% relative to the other.

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

Tracking WhiteKit.dev since Aug 2026.
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
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Code Beauty’s JSON Validator or JSON Lint is easy to use tool to copy, paste and validate JSON data.
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JSLint is a JavaScript program that looks for problems in JavaScript programs.
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Freeformatter is a platform that contains free online tools for developers, including formatters (json, html, xml, sql, etc.), minifiers (css, javascript), compactors, validators, and much more.
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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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