Transaction Marker Chrome Extension

Mark transaction boundaries while recording HAR files for accurate load test generation.

What is this? The Transaction Marker extension lets you flag start/end timestamps during HAR recording. This helps LoadMagic.ai understand which network requests belong to each business transaction (e.g., "Login", "Add to Cart", "Checkout").

Key Features

  • Mark transaction start/end points while browsing
  • Works even when CSP blocks network markers
  • Export timeline JSON to pair with your HAR file
  • Survives page refreshes and navigation
Chrome

Now Available on Chrome Web Store!

The easiest way to install - just one click and you're ready to go. No manual setup required.

Install from Chrome Web Store

See it in action

Manual Installation Guide

Alternative method if you can't access the Chrome Web Store

Note: Only follow these steps if you're unable to install from the Chrome Web Store above.

1

Download the Extension

Download the Transaction Marker Chrome extension package.

Download txn-marker-extension-0.1.0.zip

Version 0.1.0 - Chrome MV3 Extension

2

Extract the ZIP File

Extract the downloaded ZIP file to a folder on your computer. Remember this location - you'll need it in the next step.

Tip: Extract to a permanent location like Documents/ChromeExtensions/txn-marker since Chrome needs access to these files.

3

Open Chrome Extensions Page

Open Chrome and navigate to the extensions management page.

Copy and paste this URL into Chrome's address bar:

chrome://extensions

Note: Chrome security prevents direct linking to chrome:// URLs - please copy and paste manually.

Or click the puzzle piece icon in Chrome's toolbar and select "Manage extensions".

Here's what you should see:

Chrome Extensions page showing HAR Transaction Marker extension

1 URL bar 2 Developer mode toggle 3 Load unpacked button

4

Enable Developer Mode

Toggle on "Developer mode" in the top-right corner of the extensions page.

This enables the ability to load unpacked extensions from your local files.

5

Load Unpacked Extension

Click the "Load unpacked" button and select the extracted extension folder.

  1. Click "Load unpacked" button (appears after enabling Developer mode)
  2. Navigate to the folder where you extracted the ZIP
  3. Select the folder containing manifest.json
  4. Click "Select Folder"

The extension should now appear in your extensions list!

6

Using the Extension

Now you're ready to mark transactions while recording HAR files!

Workflow

  1. Open DevTools (F12) and go to the Network tab
  2. Start recording network traffic
  3. Open the side panel: click the side panel icon in Chrome's toolbar (or menu → Side panel → HAR Transaction Marker)
  4. Enter a transaction name and click Start before performing each action
  5. Click End when the transaction is complete
  6. Repeat for each business transaction you want to capture
  7. When finished, click "Download marker timeline" to export the JSON

Exporting Your Data

After recording, you'll have two files to use with LoadMagic.ai:

  • HAR file - Export from DevTools Network tab (right-click → "Save all as HAR")
  • Transaction markers JSON - Downloaded from the extension's side panel

Upload both files to LoadMagic.ai to generate load tests with properly grouped transactions!