
WhiteKit.dev
JSONFormatter.org
Code Beautify JSON Validator
FreeFormatter
IT Tools
CodeBeautify
CodeSwissKnife
DevsBox
CyberChef
DevToys
IT Tools
iLovePDF
10015.io
Smallpdf
TinyWow
CodeBeautify
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 — 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.
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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
DevToys - A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.
Code Beautify JSON Validator - Code Beauty’s JSON Validator or JSON Lint is easy to use tool to copy, paste and validate JSON data.
IT Tools - IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.
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.
iLovePDF - Premium online PDF tool set