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.

Formatify
Text Formatter
CodifyFormatter.org
textlint
Text-Utils
Text-Edit.Online
Online JSON Tools
Free tools for text, color & code — LinkedIn formatter, word counter, hex to RGB, YAML, case converter & more. 100% client-side. No signup.

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 | usefmtly.com |
| Pricing | — | |
| Platforms | — | |
| Company | — | Startup from the United States · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Javascript Validator yet.
usefmtly is a browser-based toolkit for text formatting, converters, random generators, list tools, and code utilities. Core functionality runs entirely in the browser, so tools open quickly and work without requiring an account. It includes utilities for formatting text, cleaning lists,...
What each product offers, as listed by its team.

No features have been listed yet.
An editorial look at what each product does well and who it suits.

No analysis of Javascript Validator yet.
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Javascript Validator and usefmtly.
usefmtly's answer:
The primary audience includes developers, technical writers, students, marketers, content creators, and everyday internet users who need quick browser-based utilities for formatting, converting, generating, cleaning, or transforming text and data.
usefmtly's answer:
usefmtly is designed to remove friction. Users can open a tool and use it immediately, without signups, paywalls, or unnecessary complexity. Core functionality runs in the browser, which makes the tools fast, simple, and practical for everyday use across desktop and mobile. It is a good choice for people who want lightweight utilities instead of bloated websites.
usefmtly's answer:
usefmtly focuses on fast, browser-based utilities that work instantly without requiring an account, a subscription, or server-side processing for core functionality. The product combines text tools, converters, generators, list utilities, and code helpers in one consistent interface, so users do not need to jump between multiple websites for simple tasks.
usefmtly's answer:
usefmtly is early-stage and primarily serves individual users, including developers, content creators, students, and productivity-focused professionals. At this stage, the product is focused more on broad everyday usefulness than on named enterprise accounts.
usefmtly's answer:
usefmtly is built with Next.js, React, TypeScript, Tailwind CSS, and Vercel. The site uses a static-export approach so pages can be deployed as fast browser-based tools with minimal infrastructure.
usefmtly's answer:
usefmtly started from a simple frustration: many small utility websites were overloaded with ads, slow scripts, or unnecessary account requirements. The idea was to build a cleaner alternative — a collection of useful browser-based tools that solve one task well, open instantly, and stay easy to use.
Share your experience with using Javascript Validator and usefmtly. 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 usefmtly since Mar 2026.
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