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Intercept, edit, and run HTTP requests directly in your browser. No account needed. Relay is an open-source Chrome extension that lets you capture, edit, and test HTTP requests directly in your browser. No account needed—just install and start using. Key Features 🔧 Capture HTTP Traffic in Real Time 📡 Relay intercepts HTTP and HTTPS requests as you browse, making it easy to filter by method (GET, POST, etc.) or URL so you only see the requests that matter. Modify Requests Instantly ✏️ Edit every aspect of a captured request, from the base URL and HTTP method to headers, query parameters, and body content. You can even adjust response details for flexible testing. Run API Requests in the Browser ⚡ Send and test API requests directly in your browser with immediate feedback—no need for external tools. You can also export requests as cURL commands if you need them for other uses. Save Your Sessions 📂 Organize and revisit your sessions, so you can easily review and analyze past requests when needed.
tweak: mock and modify HTTP requests
Mock or modify your HTTP requests to test, develop and demo your web application tl;dr tweak allows you to mock and modify HTTP requests without leaving the browser You can intercept requests/API calls and 🪄 ﹥ Modify ⁃ Response data and headers ⁃ Status code ⁃ Request payload 💸 ⁃ Request headers 💸 ﹥ Delay individual requests/API calls ﹥ Export and import rules to organize and share your configs with your team ﹥ Search requests in the background to import them automatically Premium 💸 ﹥ Modify the response data by writing custom JavaScript ﹥ Organize your workspace with collections ﹥ Change rules in bulk using global custom variables ﹥ Create mock data with random generators ﹥ Use tweak’s breakpoints and logpoints to debug requests/API calls What you CAN’T do with tweak 🚫 ﹥ Replace documents such as HTML/CSS/Images Useful links 🔗 ﹥Getting started https://tweak-extension.com/docs/intro ﹥FAQs https://tweak-extension.com/faqs ﹥Changelog https://tweak-extension.com/changelog ﹥Support help@tweak-extension.com
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. 👨💻 Built by a developer for real-world debugging and testing, Mock Express helps you simulate edge cases, validate UI behavior, and test APIs with complete control—right from your browser. Designed for developers and QA teams, it removes the need for backend changes or complex setups, making it easy to reproduce failures, test different scenarios, and keep development workflows stable and predictable. ✨ Request rules → Modify outgoing requests: headers, query parameters, URL segments, and body → Block API calls to simulate failures or remove unwanted traffic → Add delays to test latency and slow network conditions → Match requests using exact, wildcard, or regex URL patterns ✨ Response rules → Mock or modify responses with custom status codes, headers, and body → Use static JSON, saved resources, or JavaScript for dynamic responses → Skip the actual network call when mocking ✨ DevTools workflow → Inspect captured requests directly in the DevTools panel → Create request/response rules instantly from captured traffic ✅ Why Mock Express ⚡ No backend required — everything runs locally 🔒 Privacy-first — no data leaves your browser 🎯 Flexible matching — supports exact, wildcard, and regex rules 🔄 Instant control — toggle rules without losing configuration 🧪 Reliable testing — simulate errors, delays, and edge cases easily 🛠 Developer-friendly — fast setup, no complex configuration 👨💻 Who it's for → Frontend developers: test UI behavior across success, error, and edge cases → QA engineers: reproduce failures and network conditions reliably → Teams: maintain consistent test scenarios even when APIs are unstable 🔒 Privacy → Mock Express runs entirely in your browser. All rules and settings are stored locally using browser storage. No accounts, no tracking, and no external servers. → Custom scripts are user-defined and executed locally within the browser. No code is fetched or executed from external sources. 🧩 Compatibility → Works with modern frameworks (React, Angular, Vue, etc.) → Supports REST APIs over HTTP (GraphQL support coming soon)
REST Client
Use Rest Client – your powerful REST API client tool for testing and debugging HTTP requests both online and locally in Chrome This is an effective tool to simplify your API development. It integrates directly into your browser, eliminating the need for external downloads or installations. This extension offers all the essential tools developers need to efficiently interact with restful services. 🔍 Our chrome extension offers significant advantages over standalone options. Unlike traditional rest api clients, which require separate installation and maintenance, our solution is always available right in your browser. No more switching between applications—just click our icon, and chrome transforms into a fully-featured api testing software in seconds! 🔹 Intuitive request builder for all HTTP methods 🔹 Powerful header management and authentication support 🔹 Response visualization These capabilities make our extension comparable to dedicated api software, eliminating the need for additional api testing tools. 🚀 Perfect for Quick API Testing Need to test api endpoints quickly? Our chrome extension provides the perfect balance of power and simplicity. It's instantly available whenever inspiration strikes, making it a reliable choice for day-to-day testing needs. Our app integrates seamlessly with your development workflow, offering distinct advantages: 🌈 Always available in your browser environment 🌈 Minimal resource usage compared to standalone applications 🌈 Consistent experience across operating systems 🌈 Quick access to testing api during development This integration is particularly valuable for developers who work across multiple machines or need to test handlers quickly. 👨💻 Suitable for All Experience Levels Whether you're new to API development or an experienced engineer, our solution offers functionality for everyone: 🚩 Beginners will appreciate the intuitive interface and helpful documentation 🚩 Intermediate and advanced users will benefit from the streamlined workflow Our Rest Client for chrome browser maintains accessibility while growing with your expertise. 🔒 Focus on Security and Privacy Built with security in mind, our Rest Client is perfect for professional environments where data protection is paramount: 🔐 Local storage of sensitive data with encryption options 🔐 No server-side processing of your data 📈 Continuous Improvements Our rest api client for chrome browser benefits from regular enhancements, ensuring it remains competitive: 🌟 Performance optimizations for speed and reliability 🌟 Bug fixes and stability improvements 🌟 UI refinements for better usability 🚀 Get Started Today Getting started with our browser-based online REST tool is easy.. Install our chrome extension from the Chrome Web Store and begin exploring its capabilities: 🌠 Create your first request in seconds 🌠 Configure environments for different testing scenarios 🌠 Save and organize your requests Join many developers who have discovered that a powerful rest client application can exist right within your browser! 🧠 The Smart Alternative Our Rest Client represents the evolution of api tools, bringing the power of dedicated applications directly into your browser. Build better endpoints more efficiently than ever before, without sacrificing functionality. - 🚀 Postman: The Postman download process can be lengthy, and it requires separate installation, consuming more resources. In contrast, our chrome rest api client is instantly accessible, right within your browser. While there is the postman online service that offers an online version, it doesn't provide the full functionality of the desktop app. - 🌙 Insomnia: As a standalone application, insomnia rest client has a steeper learning curve compared to our integrated rest client in chrome, which is designed for ease of use. - 🆕 Bruno and 🔧 Advanced rest client (ARC): These options offers more complex features, like scripting capabilities, but they also requires installation. Many developers use a range of API testing solutions, such as our Chrome extension, Postman, Insomnia, and Bruno rest clients. However, for quick and efficient development our extension is increasingly becoming the preferred choice among developers.
ModResponse - Mock and replay API
Mock, modify, and replay API. Easy setup. No proxy needed. No code change required. ModResponse is a powerful and easy-to-use tool for web developers that simplifies the process of modifying, stubbing, and replaying HTTP responses. It requires no extra proxy or code change to be made, allowing you to quickly and conveniently test different scenarios and debug edge cases. With ModResponse, you can modify the API response, return different HTTP status code, add delay to your request, etc. You can also reroute your HTTP request to a different server, allowing you to test your local changes in production domain within seconds, without the risk of breaking production. ModResponse does not require extra proxy or making any code change. It can modify pretty much any HTTP request, not just XHR requests. Simply install it and you are ready to go! ** What can ModResponse do?** - Record and replay HTTP response - Stub HTTP response - Reroute request to a different URLs - Change HTTP response body, status code, and headers - Delay HTTP requests to simulate slow network - Simulate network errors - Advanced filtering by tab, tab group, window, or time - Demo with fake data Want to create perfect data for your product demo? With ModResponse, you can replace the actual API response with a fake one that contains the data you want. No need to change your real data or make code change. - Speed up slow requests Do you have API requests that are taking a long time to finish, and every time you make a small UI tweak you need to wait >10 seconds for the API request to finish to visualize your change? Using replay response, you can record and replay the slow API request. That way, you will only need to wait on the slow API request once. All subsequent requests to be served from the cached response within a few milliseconds. - Develop against edge cases Need to handle a 4XX or 5XX status code from an XHR request, or try out how your UI will behave with a very long string? Using replay response or stub response, you can modify the response body, status code, or response headers to simulate different scenarios that you need to handle. - Develop against unimplemented APIs Are you a web developer who is blocked because an endpoint you depend on is not yet implemented? Using stub response, you can mock the API response so you can start developing against that endpoint. That way, you can develop the frontend while others implement the endpoint (as long as the actual implementation return the response in the same format). - Testing on production domains Do you need to integrate with a third party platform that only works on your production domain? Using proxy request, you can reroute the request from your production domain to localhost or a dev domain, allowing you to test your changes on your production domain without the risk of breaking it. - Debug edge cases Need to test how your app behaves when some resources takes too long to load, or when they fail to load due to network errors? With ModResponse, you can add artificial delay and simulate different network error conditions so you can debug and handle edge cases with ease. ** Other ModResponse features ** - Support having multiple profiles with quick switching between profiles - Export and import profile - Easily share your profiles with others - Dark mode support - Customizable profile badge - Clone profile ...and more!!! "debugger" is required in order for response modification to work. "tabs" permission is required for prefilling the URLs, and for tab filter, tab group filter, and window filter to work. "storage" and "unlimitedStorage" are required to store the response modification. "contextMenus" is used to enable quick pause/unpause by right-clicking on the icon. ** Known issues ** 1, You will see ["ModResponse" started debugging this browser] banner when ModResponse is activated. This is because it uses the debugger API, which is needed for response modification. Due to Chrome's security policy (https://crbug.com/1096262), that banner would show up on all tabs even when a tab is not being modified, and it may still for a few more seconds after ModResponse is paused or disabled. To hide it, you can run chrome with --silent-debugger-extension-api command line switch. 2, Clicking on the "Cancel" button on the ["ModResponse" started debugging this browser] banner will not deactivate ModResponse. To deactivate it, please open ModResponse and click on the "Pause" button. Once paused, the banner should disappear in a few seconds.
