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Mock Express - Modify, Mock & Intercept HTTP Requests Locally
Intercept, mock, and modify API requests directly in your browser. No server needed. 100% local and secure.
Users359Current public install base
Rating5.0Store average score
Reviews9Public review volume
Manifest versionV3Extension platform version
7-day growth0Net users gained this week
7-day growth rate0%Relative weekly velocity
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4 assetsMock Express - Modify, Mock & Intercept HTTP Requests Locally Media preview
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5.00
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2026年7月12日2026年7月18日
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Version3.0.1
ManifestV3
Size1.17MiB
Languages1English (United States)
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English (United States)
Overview
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Mock Express is a powerful browser extension designed for developers and testers to intercept, inspect, and modify HTTP requests and responses—all directly from the browser. Whether you're working with unstable APIs, simulating edge cases, or testing UI behavior under different backend conditions, Mock Express gives you the tools you need.
🚀 Key Features
🔧 Request Actions
Modify Request
Alter headers, URL segments, body content of outgoing API requests before they’re sent.
Block Request
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Store average score5.0Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average5.0Average computed only from synced review bodies below
Reviews with text5Synced review bodies
Total ratings / reviews9Chrome Web Store public rating/review count
Store average score: 5.0. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
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This is one of the best API mocking extension I've ever used. I have tried many other similar extensions, some does not take into effect immediately, one needs to refresh/disable/enable multiple times or by luck. But Mock Express works seamlessly, when you enable your mocks, it reflects immediately. Its UI is user friendly, easily find functions you want. Most functionalities are presented (offer all kinds of functionalities the same as those paid extensions), making your development with mock flawlessly and being my 1st choice since.
I found this extension more helpful than other mocking tools I've used in the past. Kudos to the developer! One suggestion - I can modify the request body, but it would be great to also have an option to modify request headers.
gets the job done!
Made my life easier and super useful for all my workflows
This is the best extension I ever used for mocking HTTP response. I spent hours waiting for backend changes to reflect on UI. This extension saved me tons of time and efforts.