Chrome's built-in DevTools cover most debugging needs, but a few extensions fill specific gaps: identifying what a website is built with, pretty-printing raw JSON responses, inspecting React component trees, or clearing cached data without digging through settings. Each one targets a narrow, well-defined job rather than replacing DevTools itself.
Identify the tech stack behind any website
Wappalyzer scans a page and reports the frameworks, analytics tools, CMS and hosting it detects, all from its toolbar icon. This is useful when researching a competitor's site, evaluating a client's existing stack before a project, or simply satisfying curiosity about how a page was built, without opening the page source manually.
Format JSON and inspect React components
JSON Formatter turns a raw JSON API response into a readable, collapsible tree directly in the browser instead of a wall of unformatted text. React Developer Tools adds a panel to Chrome DevTools showing the component tree, props and state of any page built with React, which speeds up debugging without adding console logs.
Clear cache while testing changes
When testing a deployed change, stale cached files can make it look like your fix didn't work. Clear Cache lets you wipe cached data for the current site in one click instead of opening Chrome's settings each time, which matters when you're testing the same page repeatedly during a session.