json poll is a free Chrome add-on developed by BeeOne that allows users to poll JSON data and display the results in the toolbar. This add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. With json poll, users can easily monitor and track specific fields in a JSON file.

The main functionality of json poll is to continuously retrieve data from a specified JSON URL, as set in the options. Every second, the add-on reads two fields from the JSON file: "param" and "t". If the value of "param" is equal to "ok", the app icon displays "ok" with a green background. On the other hand, if the value of "param" is not "ok", the app icon displays the value of "t" with a yellow background.

This simple yet powerful add-on provides a convenient way for users to stay updated with real-time JSON data. Whether you need to monitor the status of certain parameters or track specific values, json poll offers a straightforward solution within the Chrome browser.