How do I create a HAR file?

About HAR files

If you are experiencing browser-related problems such as slow display, generate a HAR file to find details about the network requests sent by the browser when the problem occurred.

Creating a HAR file

Chrome

  1. Display the problematic page in Google Chrome.
  2. Right-click anywhere on the page and select [Inspect] from the dropdown menu.
  3. In the panel that appears at the bottom of the screen, click the [Network] tab.
  4. Find the round "Record" button in the upper left corner and verify that it is red. If the button is gray, click it once and it will turn red.
  5. Check the box next to "Preserve log".
  6. Click the "Clear" button (img src) to erase all existing logs.
  7. Reproduce the problem in question.
  8. Then, right-click on the list at the bottom of the screen and select [Save as HAR with Content] to save the file.

fetched from Gyazo

Firefox

  1. Display the problematic page in Firefox.
  2. Click the hamburger menu icon (☰) in the upper right corner of the window and select More tools -> Web developer tools.
  3. In the panel that appears at the bottom of the screen, click the [Network] tab, and reproduce the problem.
    • Note: The recording will start automatically, so execute this action in your browser.
  4. Verify that all actions have been generated in the Developer Network panel. Then, right-click anywhere under the "File" column and click [Save all as HAR File].

fetched from Gyazo

Microsoft Edge

  1. Display the problematic page in Microsoft edge.
  2. Right-click anywhere on the page and select [Inspect] from the dropdown menu.
  3. In the panel that appears at the bottom of the screen, click the [Network] tab.
  4. Find the round "Record" button in the upper left corner and verify that it is red. If the button is gray, click it once and it will turn red.
  5. Check the box next to "Preserve log".
  6. Click the "Clear" button (img src) to erase all existing logs.
  7. Reproduce the problem in question.
  8. Then, right-click on the list at the bottom of the screen and select [Save all as HAR with Content] to save the file.

fetched from Gyazo

Note

  • Due to due to browser specification changes and updates, browser item names and button positions may differ from the contents shown in this guide.　　
  • For information on how to generate HAR files in other browsers, perform an internet search with the search phrase "generate HAR file in [browser name]".
  • Note that HAR files contain personal data.
  • When contacting Kuroco support, include the HAR file as an attachment in your support request.

If you have any other questions, please use our contact form or Slack workspace.