WhiteKit.dev
JSONFormatter.org
Code Beautify JSON Validator
FreeFormatter
CyberChef
CodeBeautify
CodeSwissKnife
DevsBox
IT Tools
CyberChef
10015.io
TinyWow
DevToys
iLovePDF
A.Tools
Smallpdf
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, tokens, and production payloads. No sign-up, no upload step, and it keeps working offline once loaded.
Each tool is built to handle real edge cases rather than just the happy path โ the cron parser implements Quartz 6-field semantics correctly, the IPv6 ULA generator follows RFC 4193 Appendix A, and the subnet calculator handles /31 and /32 edge cases.
WhiteKit.dev
IT ToolsBased on our record, IT Tools seems to be more popular. It has been mentiond 9 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Some possibly relevant bookmarks if anyone is working on something similar - https://clipdrop.co/ - https://cobalt.tools/ - https://gchq.github.io/CyberChef/ - https://ditherit.com/ - https://it-tools.tech/ - https://blgardner.github.io/prism.tools/ - https://www.no-background.coffee/ - https://omnitools.app/. - Source: Hacker News / 8 months ago
There are lots of these, but this is the first that I've seen that focused on frontend dev a bit more. I've saved it to my list of tools for reference. Here's another with a more local / backend / IT flavor: https://it-tools.tech I have a couple more local apps with similar functions. Here's one that's cross platform[0]. This one appears to be Mac only[1]. Someone else mentioned not being able to remember these... - Source: Hacker News / 8 months ago
How does it compare to the free, self hostable https://it-tools.tech/ ? - Source: Hacker News / over 1 year ago
Seems pretty similar to https://it-tools.tech/ (https://github.com/CorentinTh/it-tools). - Source: Hacker News / over 1 year ago
There is also IT-Tools and CyberChef. Selfhost-able projects to create your own instance of "online utilities tools" https://gchq.github.io/CyberChef/ https://it-tools.tech/. - Source: Hacker News / about 2 years ago
JSONFormatter.org - Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON
CyberChef - The Cyber Swiss Army Knife
Code Beautify JSON Validator - Code Beautyโs JSON Validator or JSON Lint is easy to use tool to copy, paste and validate JSON data.
10015.io - 10015.io is an all-in-one toolbox offering many tools from various categories.
FreeFormatter - 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.
TinyWow - TinyWow provides free online conversion, pdf, and other handy tools to help you solve problems of all types.