#Har file viewer how to
#Har file viewer archive

With this information, we can identify bottlenecks (ex.what is the slowest request of that URL), find low-hanging fruit (ex.asset compression is one flag away in your build system tool) and prioritize tasks in order to improve performance on our pages. Click the Export HAR (down arrow icon) to export the HAR file. Check the Preserve Log and Disable cache checkboxes to record all interactions. In the Developer Tools panel, choose the Network tab. Go to View > Developer > Developers Tools.

Request timing information (ex.: waiting and downloading times) Open a new incognito window in Google Chrome.

Protocols being used in the page (http 1.1, http 2, h3-29).

#Har file viewer archive

We can extract a lot of valuable information from HAR files, such as: The HTTP Archive format, or HAR, is a JSON-formatted archive file format for logging of a web browsers interaction with a site. and we can use it in the HAR Viewer for performance analysis. Next, the generated HAR is stored in page.har. If you are curious about how the fromLog function works, I would recommend reading the package source-code, in special one of their tests. In line 12, we use the fromLog function to build the HAR object, which we store in the file system in the following line. This is what we are storing in line 10 and this is the array of raw events that chrome-har-capturer needs to generate a HAR file. What I didn’t mention was the function also keeps the artifacts created by the DevTools protocols.

#Har file viewer how to

In my other posts, I shared how to use the lighthouse() function to get all kinds of information: from web vitals metrics to page screenshots.

Save the HAR file for further analysis.1 const lighthouse = require( 'lighthouse') Ģ const chromeLauncher = require( 'chrome-launcher') ģ const = await lighthouse(url, options) ġ1 12 const har = await fromLog(url, defaultPass) ġ3 writeFileSync( 'page.har', JSON.stringify(har)) Once you have reproduced the issue and you see that all of the actions have been generated in the Developer Network Panel (should just take a few seconds), right-click anywhere under the File column, and click on Save all as Har. The recording autostart when you start performing actions in the browser. The Developer Network Tools opens as a docked panel at the side or bottom of Firefox. Select the Firefox menu (three horizontal parallel lines) at the top-right of your browser window, then select Web Developer > Network. Open Firefox and go to the page where you are experiencing trouble. Then save the file to your computer: Save as HAR with Content. Once you have reproduced the issue, in Chrome, click Download. Reproduce the issue that you were experiencing before, while the network requests are being recorded. Select Console and make sure Preserve Log checkbox is ticked. If it is grey, click it once to start recording.Ĭlick the Clear button ( ) to clear out any existing logs from the Network tab. Look for a round Record button ( ) in the upper left corner of the tab, and make sure it is red. Look for the Vertical ellipsis button ( ) and select More Tools > Developer Tools.įrom the panel opened, select the Network tab. Open Google Chrome and go to the page where the issue is occurring. har file on your computer, then attach the file to your. Click the Save button (indicated in the red square in the image below) Choose a name for your HAR file, and click Save. click play on the video or reload the page). The HAR file is used to save the information of all web requests made with the browser tab. Right click on the page and choose Inspect Element. The extension of the HAR file format is “.har”. In the network environment, when the communication between the sender and the receiver occurs, HAR contains HTTP response and request headers. HAR (HTTP Archive Format) is a JSON archive file format that stores session data over many browsers (IE, Firefox, Chrome, Safari, etc.) between client and server. This article provides instructions on how to collect HAR (HTTP Archive Viewer) logs in Google Chrome and Firefox.

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