Mock Express EN
Mock Express · Firefox
Mock Express lets developers intercept and modify HTTP requests in the browser. Mock API responses, block or delay requests, redirect URLs, and more—all with a simple interface. Ideal for frontend devs and QA testing dynamic API behavior.
<all_urls>），意味着它可以读取你在任意站点的页面内容，包括已登录的页面。这是许多扩展正常工作的必要条件，但也值得你确认来源可信。
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简介
MockExpress 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, MockExpress gives you the tools you need.
🚀 Key Features
🔧 Request Actions
Modify Request
Alter headers, body content, or URL of outgoing API requests before they’re sent.
Block Request
Instantly stop specific API calls from being made—useful for testing error states or eliminating unwanted traffic.
Delay Request
Simulate slow networks by delaying requests for a custom duration to mimic latency or throttling.
🔁 Response Actions
Mock / Modify Response
Override real API responses with custom JSON, status codes, or error messages. Ideal for testing frontend components without needing real backend responses.
🌐 URL Actions
URL Redirect
Seamlessly reroute API requests to different endpoints or servers (e.g., from production to staging).
Modify Query Parameters
Add, remove, or change query parameters in outgoing requests dynamically.
🔍 Coming Soon
Real-Time Request Monitoring & Logging
View and track outgoing requests, intercepted actions, and responses in real time for debugging and validation.
GraphQL Request Mocking
Full support for intercepting, modifying, and mocking GraphQL queries and mutations.
Rules Export / Import
Save and share your rule configurations easily across teams or environments.
Advanced Filtering
Apply conditions to rules based on method, hostname, or request path with more precision.
👨💻 Built For
Frontend Developers
Easily test UI components against various API states—without waiting for backend readiness.
QA Engineers
Simulate edge cases like timeouts, server errors, and malformed responses without altering production systems.
Dev Teams
Create stable test environments, even when backend services are unstable, incomplete, or unavailable.
🔒 Privacy & Security
MockExpress runs entirely within your browser environment. It does not send or store any data externally. Your mock rules, request logs, and configurations are all stored locally using browser storage (no servers, no tracking, no analytics).
✅ Why Choose MockExpress?
No backend or network setup needed
Intuitive interface with clear rule management
Lightweight and fast—optimized for developer workflows
Works seamlessly across most modern frontend stacks (React, Angular, Vue, etc.)
🧩 Integration & Compatibility
Compatible with most modern frontend frameworks
Mock Express 是做什么的
Mock Express 是一款面向 Firefox 的开发者工具类扩展，主要用来调试页面、查看样式与请求、测试接口、辅助前端开发。官方对它的介绍是：Mock Express lets developers intercept and modify HTTP requests in the browser. Mock API responses, block or delay requests, redirect URLs, and more—all with a simple interface. Ideal for frontend devs and QA testing dynamic API behavior.在Firefox 附加组件商店（AMO）上，它当前版本 2.0.5，约 59 名用户。
适合什么人用
从功能定位看，Mock Express 更适合前端工程师、测试与需要经常查看页面结构的用户。如果你平时只是偶尔遇到相关需求，用浏览器自带功能也能凑合；但如果这件事每天都发生，装一个专门处理它的扩展通常比手动操作省事得多。需要注意的是它作用于所有网站，装上后建议先观察一两天，确认不影响常用站点的正常使用。
怎么安装 Mock Express
- 打开Firefox 附加组件商店（AMO）上的官方页面；
- 点「添加到浏览器」并确认权限提示；
- 装好后在扩展列表里固定图标，方便随时开关。
本站只做索引与介绍，安装包来自官方商店。如果商店页面提示当前地区不可用，说明该扩展未在你所在区域上架。
常见问题
Mock Express 是免费的吗？
Mock Express 在Firefox 附加组件商店（AMO）免费提供下载。它是浏览器扩展，装上就能直接用，不需要注册账号。
Mock Express 安全吗？
它只申请了 0 项权限，范围比较克制，没有申请「读取所有网站数据」这种大权限。
Mock Express 支持哪些浏览器？
当前收录的版本来自Firefox 附加组件商店（AMO），适用于 Firefox。同一个扩展在其他商店可能有对应版本，但功能与版本号不一定相同。
怎么卸载 Mock Express？
在扩展管理页找到 Mock Express，点移除即可。它在本地保存的设置会一起清掉，不会残留数据。
权限清单 来自 manifest.json 原文
站点访问 1
<all_urls>
接口权限 3
contextMenusstorageunlimitedStorage