
CodeClimate
Codacy
SensioLabs Insight
ESLint
SonarQube
Source-Navigator NG
CodeFactor.io
Coveralls is a code coverage history and tracking tool that tests coverage reports and statistics for engineering teams.
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.

Which is more popular?
Based on our record, Coveralls should be more popular than Javascript Validator. It has been mentioned 14 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | coveralls.io | beautifytools.com |
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Coveralls is recommended for software development teams and individual developers who are focused on improving code quality through comprehensive test coverage. It is especially useful for projects that already utilize CI/CD workflows, as it integrates smoothly into these processes. Teams seeking to maintain high standards of test-driven development will particularly benefit from its features.
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Recommendations tracked on public social media and blogs since March 2021.

For open-source projects, many SaaS platforms offer free tiers for monitoring. For tracking code coverage, you can use Codecov or Coveralls. For tracking complexity, CodeClimate is a good option. These platforms integrate well with... - Source: dev.to / about 2 years ago
Cpan_coverage: This calculates the coverage of your test suite and reports the results. It also uploads the results to coveralls.io. - Source: dev.to / over 2 years ago
I will normally use GitHub Actions to automatically run my test suite on each push, on every major version of Perl I support. One of the test runs will load Devel::Cover and use it to upload test coverage data to Codecov and Coveralls. - Source: dev.to / over 3 years ago
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
When comparing Coveralls and Javascript Validator, you can also consider the following products.

Code Climate provides automated code review for your apps, letting you fix quality and security issues before they hit production. We check every commit, branch and pull request for changes in quality and potential vulnerabilities.
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Automated Code Review for GitHub & BitBucket
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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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JSLint is a JavaScript program that looks for problems in JavaScript programs.
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PHP Project Quality Done Right.
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The fully pluggable JavaScript code quality tool
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