Developer Tools
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Postmaster

An advanced postMessage devtools panel for Chrome

Users63Current public install base
Rating--Store average score
Reviews0Public review volume
Manifest versionV3Extension platform version
7-day growth+6Net users gained this week
7-day growth rate+10.5%Relative weekly velocity
Preview

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6 assets
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User Growth Over Time

56586062642026年7月11日2026年7月17日2026年7月17日Latest: 63
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7-day growthGrowing
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Technical snapshot

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Version0.1.4
ManifestV3
Size103KiB
Languages1English
Published
Store updated
Last crawled
English
Overview

Product summary

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Postmaster is a devtools panel for logging postMessages, which can be useful for debugging cross-window communication, including messages sent from iframes and MessageChannels. It includes a feature rich toolbar, making it a powerful debugging tool:

FEATURES:

LOGGING: Postmaster logs all messages with their origin, destination, time received, timestamp offset, and payload. Clear your logs at any time.

FILTERING & SEARCHING: Add filters to prevent logging of unwanted or frequent messages, reducing noise. Once messages are logged, you can search through them using the search tool. Both filtering and search support targeting messages by origin, destination, or even the data payload — includes regex support for advanced use cases.

SORT: Toggle how inbound messages are displayed, based on their time of receival.

PRETTIFY: By default, Postmaster displays all message payloads as formatted JSON when applicable. For a more compact view, you can turn this off.

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Store average score--Chrome Web Store aggregate rating, including ratings without synced review text
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Reviews with text0Synced review bodies
Total ratings / reviews0Chrome Web Store public rating/review count

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