A Chrome extension that captures the content of postMessage.

Latest Version

Version

1.2.0

Update

August 22, 2021

Size

750KiB

Developer

postMessage-catcher Extension

An effective development tool to help you capture all messages posted and received on the current page.

It aims to provide an easier debugging experience when you need to communicate with other iframes.

Contributions are welcome to the Github project.

Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 2, "name": "postMessage-catcher", "version": "1.2.0", "description": "A Chrome extension that captures the content of postMessage.", "icons": { "16": "img/icon-16.png", "48": "img/icon-32.png", "32": "img/icon-48.png", "128": "img/icon-128.png" }, "author": "yang jin", "background": { "scripts": [ "js/background.js" ] }, "browser_action": { "default_icon": "img/icon-48.png", "default_title": "postMessage catcher", "default_popup": "popup.html" }, "content_scripts": [ { "matches": [ "" ], "js": [ "js/content-script.js" ], "run_at": "document_idle" } ], "web_accessible_resources": [ "js/injected-script.js" ], "homepage_url": "https://github.com/niexia/postMessage-catcher", "permissions": [ "storage" ]}

Download CRX(750KiB)

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User reviews

Matt P (ID: 000000acd7fead05) Voted 1 ★ - Updated 01/20/2023 Tried this in Jan 2023 to understand how the youtube javascript embed API interacts over postMessage. This extension doesn't catch or report any of the postMessages that may happen in sub-iframes (e.g. not in the top window). So if you prototype something in codepen or whatever you won't see the postMessages in this extension. It appears (limited testing) it only reports postMessages RECEIVED by the top window...so you don't even see postMessages sent by the top window to child iframes. This makes this extension pretty useless as you can add a single "message" listener that logs messages in the devtools console to accomplish the same thing.

Get source code (.Zip)

Drop .crx file here or click
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postMessage-catcher