Download Network Logs for JustCall Support

Troubleshooting3 min readUpdated 2026-03-12

Download Network Logs for JustCall Support

When troubleshooting call quality or connectivity issues, JustCall support may ask for your browser's network logs. This guide shows you how to capture a HAR (HTTP Archive) file from Chrome DevTools.

Available on: All plans

What is a HAR file?

A HAR file records all network requests your browser makes — including API calls, WebSocket connections, and resource loading. It helps support engineers identify:

Failed API requests
Slow server responses
WebSocket disconnections during calls
Blocked resources from firewall or proxy

How to capture a HAR file in Chrome

Step 1: Open DevTools

Open Chrome and navigate to app.justcall.io.
Press F12 (Windows/Linux) or Cmd + Option + I (macOS) to open DevTools.
Click the Network tab.

Step 2: Configure the capture

Confirm the red record button (top-left of the Network tab) is active (red means recording).
Check the Preserve log checkbox — this keeps the log even if the page reloads.
Optionally check Disable cache to capture a clean network trace.

Step 3: Reproduce the issue

With DevTools open and recording, perform the action that triggers the problem (make a call, send an SMS, etc.).
Let the issue occur — do not close DevTools or navigate away.
Wait a few seconds after the issue occurs to capture any follow-up requests.

Step 4: Export the HAR file

In the Network tab, right-click anywhere in the request list.
Select Save all as HAR with content.
Save the file to your desktop with a descriptive name (e.g., justcall-dropped-call-2026-03-12.har).

How to capture a console log

In addition to the HAR file, console logs can reveal JavaScript errors:

In DevTools, click the Console tab.
Right-click anywhere in the console output.
Select Save as... to export the log as a text file.

What to include in your support ticket

When submitting a ticket to JustCall support, include:

Item	Details
HAR file	Attach the exported `.har` file
Console log	Attach the exported console log
Description	What happened, when, and what you expected
Timestamp	Exact date and time of the issue (with timezone)
Call details	Your JustCall number, the other party's number, call duration
Browser version	Copy from `chrome://version`
Network test results	Screenshot from Settings > Network Test
Steps to reproduce	Numbered steps to recreate the issue

Privacy note

HAR files may contain sensitive data such as authentication tokens and cookies. JustCall support handles these files securely. If you are concerned, you can:

Use a HAR sanitizer tool to remove cookies and tokens before uploading.
Mention to support that you have sanitized the file so they can account for missing auth data.

Capturing logs in other browsers

Browser	How to open DevTools	Network log export
Firefox	F12 or Cmd+Option+I	Network tab > gear icon > Save All As HAR
Edge	F12 or Cmd+Option+I	Same as Chrome (Chromium-based)
Safari	Cmd+Option+I (enable in Develop menu first)	Network tab > Export