List of Online Code Checkers

We’ve all been there. There’s that one task you’ve been avoiding on your todo list. It’s not even that hard, to be honest. It just involves something finicky, fiddly, and unfamiliar. Maybe it’s a particularly tricky regex or a shell script that needs written. Luckily, it’s the 21st century and there are a plethora of resources to aid coders in these tasks. May I present The Big List of Online Code Checkers:

Devops Stuff

Crontab: http://crontab.guru
mod_rewrite Rules: http://martinmelin.se/rewrite-rule-tester
Shell Scripts: http://www.shellcheck.net
SPF Record: http://www.spfwizard.net
Subnet Calculator: http://www.subnet-calculator.com

Runners up – local devops tools for checking syntax

Apache: apachectl configtest
Bind: named-checkconf /etc/named.conf
Nginx: nginx -t -c conf/nginx.conf
Postfix: postfix check
SSH: sshd -t – Use this every time if you don’t want to get locked out :)

Coding Playgrounds

These are great for spiking on a solution in a less-familiar language.

Collaborative Editor: http://collabedit.com
Elixir: http://elixirplayground.com
Go: https://play.golang.org
Javascript/CSS/HTML: https://jsfiddle.net
PHP: http://www.tehplayground.com
Python: http://mathcs.holycross.edu/~kwalsh/python
Regular Expressions: http://rubular.com
Ruby: http://rubyfiddle.com
Sass: http://www.sassmeister.com
SQL: http://sqlfiddle.com

Online Code Checkers, Formatters & Converters

CSS validator: https://jigsaw.w3.org/css-validator/
HAML to ERB converter: https://haml2erb.org
HTML Tidy: https://infohound.net/tidy/
HTML validator: https://validator.w3.org
Javascript Minifier: http://jscompress.com
JSON validator/formatter: https://jsonformatter.curiousconcept.com
RSS/Atom validator: https://validator.w3.org/feed/
YAML: http://www.yamllint.com

SEO

robots.txt: Google Webmaster Tools
Structured Data: https://developers.google.com/structured-data/testing-tool/
XML Sitemap Generator: https://www.xml-sitemaps.com

This is just a small sampling of what’s available. There are online code checkers, validators, converters, formatters, and generators for just about anything you can imagine. Next time you find yourself with a dreaded task in

What online code checkers, formatters, or generators do you use on a regular basis?

About Alexander

Alexander has been programming for a very long time. When he met Ruby, it was love at first sight.
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