The 17 Best Developer Tools and Extensions
A data-driven list of the best browser extensions for Developer Tools. We analyzed user ratings, popularity, and update frequency to bring you the most reliable tools available.
Last updated: December 27, 2025
Developer extensions are specialized tools designed to streamline and enhance the process of building, testing, and debugging web applications. They act as power-ups for your browser, offering insights and control that are otherwise unavailable.
These extensions tackle common frustrations, such as managing network requests or inspecting complex data. For instance, Requestly: Supercharge your Development & QA allows you to modify network requests and responses on the fly, ideal for testing different scenarios without altering your live code.
Debugging JavaScript and understanding application behavior is also made simpler. Google Analytics Debugger helps ensure your analytics tracking is implemented correctly by providing real-time feedback within your browser console. For developers working with data, JSON-handle offers a much-needed pretty-print and syntax highlighting feature for JSON, making it vastly easier to read and understand nested structures.
These tools are invaluable for anyone involved in web development, saving significant time and reducing errors by providing direct access to crucial information and manipulation capabilities.
How This List Was Made
Our "Best of Developer Extensions" list is compiled using a rigorous, weighted scoring system. This system prioritizes user feedback and adoption. Extension rankings are determined by a combination of factors: user ratings (40%), the total number of users (35%), and the proportion of users who left reviews, ensuring rating reliability (15%). A final weighting is given to how recently the extension was updated (10%).
