postMessage-catcher icon

postMessage-catcher

by yangjin

v2.0.0 Updated Apr 30, 2025 2.25MiB
CWS
1K
Users
★ 4.00
4 reviews
#18418
of 207.8K
developer
#1510 of 18.2K

Description

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.
postMessage-catcher screenshot 1

Reviews (1 cached)

★☆☆☆☆2023-01-20
Matt P

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.

Permissions (1)

Permissions

storage Can store data locally in your browser

Details

Version 2.0.0
Updated Apr 30, 2025
Size 2.25MiB
First Seen Mar 31, 2026