Developer Toolbox

JSON viewer, XPath finder, regex tester, JWT decoder, API tester - 16 dev tools in one persistent Chrome side panel. No more switching tabs.

Features

JSON viewer, editor, diff, JSONPath query, and JSON-to-CSV converter

XPath finder and expression tester against the live page DOM

Real-time regex tester with match highlighting

JWT decoder for header, payload, and signature inspection

API tester with custom headers, body, and copy-as-cURL

Base64, URL encoder/decoder, color converter, timestamp converter, and more

This extension is completely free to use with all features included.