HAR/JSON Viewer is a Chrome add-on developed by Savr Goryaev. It is a free tool that allows users to easily visualize and explore HTTP Archive (HAR) files, both locally and online. Additionally, it offers a JSON tree view for HAR files and any structured JSON files.

With the embedded HAR/JSON viewer, users can seamlessly switch between different views - HAR, JSON tree, and plain (original) views. This flexibility enables users to analyze and understand the data in these files according to their specific needs.

One important note to mention is that in order to use the viewer with local files, users must grant the necessary permission. This can be done by accessing the chrome://extensions page, locating the HAR/JSON viewer, going to Details, and allowing access to File URLs.

HAR/JSON Viewer is a valuable tool for developers, web analysts, and anyone working with HAR or JSON files. It simplifies the process of visualizing and exploring data, making it easier to analyze and extract insights.