HAR file viewer

Use Our Free HAR File Viewer and Analyzer for Easy Network Debugging

Use our free HAR file viewer to instantly upload and inspect your HAR (HTTP Archive) files online. Whether you’re debugging network performance or analyzing web traffic, this tool is the perfect HAR file viewer and analyzer to help you diagnose issues faster.

PS. Scroll down for even faster debugging.

How to view HAR files online

Upload your HAR files instantly and start analyzing them online. Made with 💜 by the developers at Jam.

How to Create a HAR File

• Navigate to the page where the issue is occurring.
• In the web browser menu (we’re using Google Chrome), choose "View" → "Developer" → "Developer Tools". Or right-click anywhere in your browser window and select "Inspect".
• Select the "Network" tab within the Developer Tools panel.
• Check "Preserve log" to ensure all requests are recorded.
• Stop the current recording by clicking the 🔴 button (it will turn ⚫️).
• Clear existing logs with the 🚫 button to start fresh.
• Start a new recording by clicking the record button (it will turn 🔴).
• 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.

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 web traffic. With the HAR file viewer you can see network performance and troubleshoot the root cause of front-end bugs.

• Upload:
  HAR file analysis is simple with our online HAR file reader. Drag and drop into our viewer or click to upload.
• Navigate the entries:
  Review the list of all network requests made during the session.
• Examine request details:
  Click on any entry to see detailed information, including headers, payload, and response.
• 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.
• Export data:
  Export the data for further analysis or sharing with your team.

Meet Jam: Everything in a HAR File + More in 1 Click

Chances are you’re stuck explaining all those steps above to actually get a HAR file (or trying to reproduce issues so you can get it yourself).

Skip the manual process of generating HAR files — let Jam do the work for you. With Jam’s browser extension, you get everything a HAR file offers plus automatic steps to reproduce, metadata, and AI-powered debugging assistance. In just one click, Jam captures your screen and all the data you need to resolve bugs quickly.

Try it within minutes and debug faster with the same shortcuts you use on Chrome dev tools.

How to View a HAR File

• Web Browser Developer Tools:
  If you don't use our tool, you can view HAR files using various methods. Most modern web browsers like Google Chrome, Firefox, and Microsoft Edge have built-in developer tools that can open and analyze HAR files.
• Text Editor:
  You can open HAR files in any text editor - as they are essentially JSON files.
• Browser Extensions:
  There are browser extensions available that can help you view HAR files.

FAQs

• What is a HAR file?
  A HAR (HTTP Archive) file is a log of all web requests and responses made during a web session. It captures essential data such as load times, HTTP headers, network performance, and errors encountered while loading a website or web application. HAR files are invaluable for developers and QA teams who need to debug network issues and optimize performance by understanding the detailed behavior of a site or app during page load.
• What is a HAR file viewer?
  A HAR file viewer lets developers inspect and visualize the data captured in HAR files. This makes it easier to troubleshoot performance issues like failed requests or bottlenecks in web traffic for websites and web applications. Use our viewer to dive into DNS lookups, server response times, and more to fully understand your site's performance.
• Can I analyze HAR files with this tool?
  Yes, our tool works as both a HAR file viewer and analyzer. You can use it to review the network timings, diagnose failed HTTP requests, and address slow-loading issues in your website or web app. By analyzing the entire request-response cycle, you’ll be able to spot performance problems and make the necessary improvements.
• How to open a HAR file?
  You can open a HAR file using various tools. Our online HAR file viewer lets you upload and analyze HAR files quickly. Alternatively, you can open HAR files in any text editor (as they are in JSON format) or use the built-in developer tools in browsers like Chrome, Firefox, and Edge.
• How to analyze a HAR file?
  To analyze a HAR file, upload it to our HAR file viewer. You’ll be able to review key metrics like HTTP status codes, load times, and DNS lookups to find performance issues in your web app or site. By analyzing request timings, you can troubleshoot slow-loading elements and failed requests. You can also export the data for deeper analysis or collaboration.
• What is a HAR file used for?
  HAR files are mainly used to debug web traffic and analyze network performance. Developers and QA engineers rely on HAR files to diagnose issues like slow page loads, failed HTTP requests, and other network errors. This data is crucial for improving performance and delivering a better user experience.
• How to get a HAR file in Chrome?
  Open Chrome DevTools (F12 or right-click > Inspect), go to the Network tab, check the "Preserve log" checkbox, and start recording. Then reproduce the issue. Once done, click the export button to save.
• Can I use this tool for debugging?
  Yes! Our HAR file viewer is a powerful tool for debugging network performance. By reviewing HTTP requests, response headers, and load times, you can quickly diagnose the root cause of front-end issues, slow page loads, or failed requests. The insights provided make it easier to troubleshoot problems and improve your site's performance efficiently.