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Mock network API requests for testing and development This extension provides API request interception and mocking capabilities exclusively for localhost development environments. Its sole purpose is to help developers test web applications by creating mock API responses without modifying backend code. - Intercept HTTP/HTTPS requests on localhost (localhost, 127.0.0.1) - Create custom mock responses with configurable status codes and JSON data - Override real API responses with test data for different scenarios - Monitor and capture network requests in real-time - Test error handling and edge cases by simulating various response conditions - Add delays to simulate network latency. This is purely a development tool focused on simplifying API testing during local application development.
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
RequestScope
Monitor network requests and API failures with real-time insights 🚀 RequestScope – The Ultimate Network Monitor, API Debugger & Analytics Tool for Web Professionals! RequestScope is a professional-grade Chrome extension designed for developers, QA engineers, product managers, and advanced users. It seamlessly monitors, analyzes, and mocks network requests directly from your browser—without needing external tools like Postman or Charles Proxy. Whether you're debugging elusive API failures, optimizing page load times, mocking responses for UI testing, or analyzing third-party tracking scripts, RequestScope gives you unparalleled visibility into the network layer. 🎭 Intelligent API Mocking – Intercept and mock API responses on the fly. Test different UI states, error handling, and edge cases instantly without changing backend code. 🤖 AI-Powered "Hostile Roasts" – Get your website's performance and network health hilariously roasted (and critiqued) by AI based on real-time data! 📊 Full Payload Capture Details – Inspect request bodies, response payloads, hidden headers, and timing metrics in a clean, syntax-highlighted UI. 💾 Persistent Session Storage – Network history is preserved securely across browser restarts. Close Chrome and come back later without losing your session data! 🔍 Smart E2E Navigation Grouping – Requests are logically grouped by "Previous Load" and "Current Load", so you know exactly which actions triggered which API calls. 🛠️ Advanced API Debugging & Inspection Monitor all XHR, Fetch, Script, Document, Image, and Web Socket requests. Instantly identify 4xx and 5xx errors with color-coded alerts and visual UI indicators. Deep-dive into request and response bodies (JSON, Text, Form Data, URL params) with syntax highlighting and automatic formatting. Compare differences between two similar requests with built-in diffing tools. ⏱️ Performance & Speed Optimization Analyze page load times with precision metrics (Navigation Timing API & Fallbacks). Identify the top 10 slowest endpoints dragging down your application's UX. Monitor "Time to First Byte" (TTFB) and total request durations to optimize your Critical Rendering Path. 📈 Intelligent Analytics & Reports Generate comprehensive, shareable HTML Performance Reports with a single click. View total bandwidth weight, success/error ratios, and resource categorization charts. Track analytics across all domains with the "Full History Archive" or isolate data to the "Current Page". 🎯 Laser-Focused Filtering & Allowlisting Cut the noise. Use powerful allowlisting and domain targeting so you only capture requests for the websites you actually care about. Mute specific URLs, noisy analytics trackers, or third-party ads to keep your logs clean. Advanced Regex and glob pattern support for ultimate control over what gets captured. 🔔 Real-Time Toaster Notifications Get unobtrusive, in-page toaster alerts the exact millisecond an API fails or a request is dangerously slow. Configure custom thresholds (e.g., alert me if any request takes > 3 seconds). 🛡️ Privacy-First & Secure Runs entirely locally in your browser context. We do not track you, we do not collect telemetry, and your data never leaves your machine. All request history is stored securely using browser-native IndexedDB and Extension Local Storage. 👨💻 WHO IS REQUESTSCOPE FOR? Frontend Developers: Mock APIs while the backend is still being built. Debug CORS errors, missing headers, and malformed JSON payloads instantly. Backend Developers: Verify that your endpoints are returning the correct data shapes and HTTP status codes in the wild. QA Engineers & Testers: Capture E2E test failures, export HAR files or Postman collections, and attach full network traces to bug reports. Product Managers & SEO Experts: Monitor third-party script bloat, track page load speeds, and verify analytics firing correctly. 💡 HOW TO USE IT Install RequestScope. Click the extension icon to open the popup. Add your target website domain (e.g., localhost or yourdomain.com) to the Allowlist in Settings. Browse your site! RequestScope will silently capture, categorize, and analyze the traffic. Click any request to view full details, mock the response, or generate a final report. ⚡ Stop guessing why your web app is broken. Start debugging with precision. Install RequestScope today!
Mockiato — Free API Testing & Mocking Tool
Chrome extension to intercept requests, create real-time mocks, and auto-insert headers for web development & testing API. Mockiato is an extension for Google Chrome, designed to optimize web application development and testing. It allows you to intercept outgoing requests in real-time and create mocks for them, ensuring quick emulation of server responses. In addition, Mockiato enables the addition or modification of headers in requests. This feature significantly simplifies request configuration and saves developers' time. Combined, these tools provide flexibility and convenience, making the development and testing process more efficient and reliable. You can submit issues, bugs or feature request at https://github.com/avivasyuta/mockiato/issues
Test API
Use Test API for restful api testing. This postman alternative test rest api online and use post request online to test API endpoint This powerful API Testing Online solution eliminates the need for external applications when working with endpoints efficiently. 🚀 The Test API Chrome extension provides a comprehensive tool directly in your browser. Whether you are experienced or learning how to test api requests properly, this extension serves as your ultimate HTTP caller companion. The interface makes it simple to perform any endpoint call, from basic GET requests online to API Test Online operations and complex RESTful scenarios. 🔧 Key features that make this the ultimate API Tester Tool: 1️⃣ Instant api endpoint test functionality without leaving your browser 2️⃣ Complete HTTP request online capabilities for all major HTTP methods 3️⃣ Advanced options with custom headers and parameters 4️⃣ Real-time response visualization for effective Online API Test work The extension excels at handling various request types, making it perfect for validating service endpoints across different scenarios. You can easily execute a Test get request, perform a Post request for online operations, or handle any web request with ease. The intuitive design streamlines your development workflow significantly. 🎯 Advanced API Test Online capabilities include: ➤ Custom header configuration for authenticated endpoint scenarios ➤ JSON, XML, and form data support for comprehensive test post request operations ➤ Response time monitoring for test rest api online workflow Understanding the restful api testing properly becomes effortless with our comprehensive environment. The extension provides detailed response information, including status codes, headers, and formatted response bodies for thorough analysis. The user-friendly design ensures that even complex RESTful API endpoint scenarios remain manageable and straightforward. Whether you're debugging a single test REST API or managing multiple workflows, the interface adapts perfectly to your needs. 💡 🔒 Security-conscious developers appreciate the local processing approach - all your data remains within your browser environment. This Rest API Test Online Tool never transmits sensitive information to external servers, making it ideal for validating internal services and sensitive endpoints. 📋 Professional workflow benefits include: ♦️ Streamlined development cycles with instant test api endpoint ♦️ Reduced context switching between multiple tools and applications ♦️ Enhanced productivity through integrated capabilities ♦️ Simplified service documentation and endpoint validation processes 🌍 Common use cases where this solution excels: 🌐 Quick endpoint debugging during development cycles 🌐 Educational purposes for learning how to build HTTP request fundamentals 🌐 Integration for third-party services, including http post test scenarios 🌐 Rapid prototyping and service exploration workflows 🌐 Quality assurance test post requests for production endpoints This postman alternative supports all standard HTTP methods essential for modern Online service validation practices. From simple GET operations to complex PATCH requests, every test HTTP request type is fully supported with detailed response analysis and comprehensive error handling. The extension handles authentication seamlessly, supporting various methods from basic auth to complex OAuth flows. This makes it excellent for testing protected endpoints, where proper authentication is crucial for successful operations. Bearer tokens, API keys, and custom authentication schemes are all fully supported. ❓ Frequently Asked Questions: 📌 How do I start using this Tool? 💡 Install the extension, click the icon, and start creating your first HTTP call. The intuitive interface guides you through the process step by step. 📌 Can I test APIs that require authentication? 💡 Yes! Supports API keys, OAuth, Bearer tokens, and custom headers for various authentication methods and scenarios. 📌 Is my data secure using this Test API Online tool? 💡 All the data is processed locally in your browser for maximum privacy. No data is transmitted to external servers. 📌 Does it work with different endpoint types? 💡 Absolutely! Works seamlessly with REST, GraphQL endpoints, SOAP services, and any HTTP-based interface. 📌 Is there a limit to request size or frequency? 💡 No artificial limits are imposed. You can build large payloads and make multiple requests as needed for comprehensive HTTP validation. Regular updates ensure compatibility with the latest web standards and WEB technologies, making this tool a reliable solution for all your needs. Join thousands of developers who trust this extension for daily work with Post request online, workflows, and streamlined development processes! ⚡
