Developer Tools
Format, compare, decode, and test with essential developer utilities.
Choose a tool
Use JSON Formatter to validate or indent one JSON value, and JSON Compare to find changed paths between two values. Regex Tester shows matches and groups; CSS Generator previews Flexbox and Grid layouts.
For example, compare two pasted API responses as JSON without asking the site to fetch their URLs. JWT Decoder displays unverified claims, so never treat its output as proof of identity. Base64 Encoder/Decoder handles UTF-8 text, not binary files or encryption. Check each tool's input limit before pasting a large response.
JSON Formatter
Validate, format, and minify JSON data in your browser.
JSON Compare
Compare two JSON objects and highlight the differences.
Regex Tester
Test and debug regular expressions with real-time matching.
JWT Decoder
Decode and inspect JSON Web Tokens instantly.
Base64 Encoder/Decoder
Encode and decode Base64 strings quickly.
CSS Generator
Generate and preview Flexbox or Grid layout CSS.
API Response Comparison
Planned: save and compare JSON API responses side by side.