How to generate a HAR file in your browser

  • Last update on August 29th, 2025

Table of Contents

This how‑to will guide you through generating a HAR file with CoreView in Chrome, Firefox, and Microsoft Edge. 

With which browser do you need to generate the HAR file?

Google Chrome

 

Mozilla Firefox

 

Microsoft Edge

 
 

To generate a HAR file in Chrome

  1. Navigate to the URL where the issue is occurring.
  2. Right-click anywhere on the page and select “Inspect”. The developer tools will open either at the bottom or the right side of your browser. 
    Inspect the page
  3. Now, click on the “Network” tab.
  4. Click on the record button. Then, force a refresh of the page or click on a link related to the issue. The goal is to reproduce the problem and capture the output.
    Record the issue
  5. Once you've reproduced the issue, click on the download arrow to export the recording as HAR. Then, save the file.
    Export as HAR file
  6. Now, you can upload this output file to your support ticket or attach it to an email response.
 

To generate a HAR file in Firefox

  1. Navigate to the URL where you're experiencing the issue.
  2. Go to “More tools > Web Developer Tools > Network”, or press Ctrl+Shift+I (for Windows/Linux) or Cmd+Option+I (for OS X).
    Open the Network tab
  3. Refresh the page to begin capturing the traffic between the browser and the server. The goal is to reproduce the problem and capture the resulting output.
  4. Go to “Settings” and click “Save all as HAR” to save the HAR file.
    Save all as HAR

To generate a HAR file in Microsoft Edge

  1. Navigate to the URL where the issue is occurring.
  2. Select “Developer tools” from the menu or press F12. The developer tools will open either at the bottom or the right side of your browser. 
    Open the Developer Tools
  3. Now, click on the “Network” tab.
  4. Click on the record button. Then, force a refresh of the page or click on a link related to the issue. The goal is to reproduce the problem and capture the output.
    Select the Network tab and start recording
  5. Once you've reproduced the issue, click on the download arrow to export the recording as HAR. Then, save the file.
    Save as a HAR file
  6. Now, you can upload this output file to your support ticket or attach it to an email response.
 

 

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