How to Analyze HAR Files Online
Access our platform to instantly review your HAR files through our online interface. It’s straightforward and completely free.
How to Create and Download a HAR File in Two Simple Ways
1. Via Your Browser Developer Tools:
- Right-click anywhere in your browser window (we use Chrome) and select “Inspect”.
- Navigate to the page where the issues are occurring.
- Select the “Network” tab within the Developer Tools panel.
- Reload the page to clear old logs (if you want to start fresh)
- Optional: Check the “Preserve log” check box if you want to save logs after reloading the page or for multiple-page recording
- Optional: Click on the Start recording button or the Record network log ⚫button.
- Reproduce the issue for HAR capture.
- Once done, click the ⬇ “Export HAR” button to save it.
Detailed steps for generating HAR files on Edge, Safari, and Firefox are available on our site.
2. Via Webvizio Browser Extension (HAR File + Full Bug Report)
With the Webvizio browser extension, you don’t need to create and export a HAR file manually, as Webvizio helps you debug by automatically collecting all network request data.
- Activate the Webvizio Extension in your browser.
- Open the Developer Tools panel by right-clicking anywhere in your browser window and selecting “Inspect”.
- Navigate to the page where the issues are occurring.
- Using the Webvizio widget, click on ➕ to log a new bug.
- Click on the web element where the bug occurred and describe the issue, then click “Create”.
- In the newly opened tab with the Webvizio interface, click on the Network tab.
- Download the HAR file by clicking on the Download icon⬇️
The Webvizio bug reporting extension not only allows you to generate a .har file, but also creates a full bug report with all technical logs and repro steps with just a few clicks right from your browser.
Watch a short video on how to create and download a HAR file with Webvizio ⬇️
How to Use the HAR Analyzer for Debugging
HAR files capture a comprehensive record of web requests and responses, making them essential for debugging and analyzing network performance. With our Free HAR File Analyzer, you can see and analyze network requests, view detailed timings, and visualize performance to troubleshoot the cause of front-end bugs.
How to use
- Uploading a file
Analyzing HAR files is easy with our online HAR file reader. Just drag and drop your files into the widget or click to upload a file. .har or .json files are accepted. - Navigate the main dashboard
We created a comprehensive visual dashboard that contains all critical data from the uploaded file, including the total number of requests, the average response time, total page load time, HTTP Errors, and more. You can also view a breakdown of the top content types, top referring domains, and an interactive diagram displaying the response time distribution. - Quick navigation to the HTTP Errors details
Click on the HTTP Errors block on the main dashboard to quickly navigate to all entries returning errors. To reset the filter and back to the default view, click on the 🔁Clear Filters/Reset View button. - Search by URL
You can search for files using the full or partial URL in the search bar at the top of the widget. You can also search by specific file type by entering a file extension (e.g., .css, .js, etc.). - Examine request details
Click on any entry to see general information, request and response headers, response body, and wait time before response. You can also search requests by URL in the search bar at the top of the list. - Analyze timings:
Understand request durations, including DNS lookup, connection, SSL handshake, and response time. - Identify issues:
Spot requests that failed or took unusually long. Check headers and payloads for error messages or clues.
Webvizio: Automatically Collect HAR Files + Full Bug Reports with a Few Clicks
Tired of explaining the complex steps to obtain a HAR file or attempting to recreate issues for analysis? Bypass the tedious manual HAR file generation process by letting Webvizio handle it automatically. The Webvizio browser extension not only provides HAR file analyzer capabilities but also delivers automated reproduction steps, browser log recordings, and AI prompts for debugging. With a simple click, report bugs or design changes that pair with user activity, collecting comprehensive bug tracking data and streamlining your bug resolution workflow, making the entire debugging process a breeze.
More Than Just Bug Reporting: Generate Detailed Prompts for AI Coding Agents to Fix Bugs in Seconds
Webvizio streamlines development workflows by creating instant, detailed tasks while interacting with website elements, complete with visual references and technical specifications. The data we collect enables us to create comprehensive prompts for AI code copilots and agents, which can be utilized to debug and implement changes in minutes (and eventually even seconds).
Try our Free AI Prompt Generator →
Learn more about automatic AI Prompts →
🚀Try Webvizio Browser Extension Now →
Frequently Asked Questions
A HAR file (HTTP Archive) serves as a comprehensive record of web interactions during a browsing session. This file format captures detailed information including request timing, HTTP header data, network metrics, and any errors that occur while loading web content. Understanding what is a HAR file is crucial for development teams and QA professionals who need to investigate network-related issues and enhance website performance by examining detailed loading behavior.
A HAR file analyzer provides tools to examine and visualize the information stored in HAR files. This functionality helps developers identify and resolve performance bottlenecks and failed requests in web applications. Our viewer enables deep analysis of various metrics including DNS resolution times, server response delays, and other critical performance indicators.
Absolutely, our free tool functions as both a HAR file viewer and analyzer. It enables you to examine network timing data, investigate HTTP request failures, and resolve performance issues in your web applications. By evaluating the complete request-response chain, you can identify bottlenecks and implement necessary optimizations.
Definitely! Our HAR file analyzer excels at debugging network performance issues. Through detailed examination of HTTP requests, response headers, and loading metrics, you can efficiently identify the source of frontend problems, loading delays, or request failures. These insights enable quick problem resolution and help improve your website’s overall performance.
There are several methods to open HAR files. Our online viewer provides quick access for HAR file analysis. You can also view these files in standard text editors since they use JSON formatting, or utilize the developer consoles built into major browsers like Chrome, Firefox, and Edge. Detailed instructions for generating HAR files on Edge, Safari, and Firefox can be found here.
To begin analysis, upload your HAR file to our viewer. You can examine essential metrics including HTTP response codes, loading durations, and DNS lookup times to identify performance bottlenecks. By studying request timing data, you can pinpoint slow-loading components and failed requests. The tool also supports data export for additional analysis or team sharing.
HAR files primarily serve as tools for debugging and evaluating network performance. Development teams and quality assurance specialists use these files to investigate issues such as slow loading times, HTTP request failures, and network-related errors. This information is essential for optimizing performance and enhancing user experience.
Access Chrome DevTools (press F12 or right-click and select Inspect), navigate to the Network panel, enable “Preserve log,” and begin recording. After reproducing the issue, use the export function to save the HAR file.
The Webvizio browser extension is a handy tool that reduces the time spent on content revisions, quality assurance testing, and bug fixing for websites and web applications. You can easily point and click on any web element to report bugs or design changes without leaving your browser. Each report/task is already bundled with a live snapshot, browser information, page URL, console logs, network logs, and repro steps. Plus, based on the collected data, Webvizio generates prompts for AI coding tools like Cursor, Tabnine, Windsurf, and others, helping you implement changes or fix bugs in just seconds!
Absolutely! With the Webvizio browser extension, you can skip the hassle of manually creating and exporting a HAR file. Webvizio is here to make your debugging process smoother by automatically gathering all the network request data you need. Watch a brief video on creating and downloading a HAR file with Webvizio.
