
WhiteKit.dev
JSONFormatter.org
Code Beautify JSON Validator
FreeFormatter
CyberChef
IT Tools
CodeBeautify
CodeSwissKnife
startbase.dev
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.
# StartBase: Your All-in-One Foundation for Modern Projects
Start your next startup, SaaS project, or side hustle with StartBase—the perfect foundation offering clean, modern code that follows industry best practices and integrates trendy open-source libraries. With seamless integration of third-party services, you can save months of work and accelerate your path to success today.
Modern Tech Stack
Seamless Integrations
Clean & Maintainable Code
Community & Support
Time & Cost Efficiency
WhiteKit.dev
startbase.devJSONFormatter.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
Code Beautify JSON Validator - Code Beauty’s JSON Validator or JSON Lint is easy to use tool to copy, paste and validate JSON data.
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.
CyberChef - The Cyber Swiss Army Knife
IT Tools - IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.
CodeBeautify - Online Tools like Beautifiers, Editors, Viewers, Minifier, Validators, Converters for Developers: XML, JSON, CSS, JavaScript, Java, C#, MXML, SQL, CSV, Excel