postMessage-catcher

A Chrome extension that captures the content of postMessage.

What is postMessage-catcher?

"postMessage-catcher" is a Chrome extension specifically developed to create an efficient debugging environment. It captures all messages being posted and received on the current page, making it easy to monitor and debug communication instances with other iframes present on the page. It welcomes open-source contributions to the project on Github.

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Extension stats

By: yangjin

View on Chrome Web Store

Users: 1,000+

Rating: 3.00 (2)

Version: 1.2.0 (Last updated: 2021-08-22)

Creation date: 2021-06-06

Risk impact: Low risk impact

Risk likelihood: Low risk likelihood

Manifest version: 2

Permissions:

storage

Size: 768.00K

Email: ya*****@gmail.com

Ranking

# 30129 ▼ 136

Other rankings

#1894 in Developer Tools ▼ 1

Other platforms

Not available on Firefox

Not available on Edge

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Extension summary

Analyze keywords

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.

User reviews

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.