"manifest_version": 3, "name": "Tamper Data - Request Interceptor", "version": "1.0.0", "description": "Intercept and modify HTTP request headers before they are sent.", "permissions": [ "declarativeNetRequest", "declarativeNetRequestFeedback", "storage", "activeTab" ], "host_permissions": [ "<all_urls>" ], "background": "service_worker": "background.js" , "action": "default_popup": "popup.html", "default_title": "Tamper Data", "default_icon": "16": "icons/icon16.png", "48": "icons/icon48.png", "128": "icons/icon128.png"
is an open-source browser extension designed for Chromium-based browsers (Chrome, Edge, Brave) that acts as a "man-in-the-middle" between your browser and the web server. Unlike the original Tamper Chrome (v1), which is deprecated, Tamper Dev (v2) does not require an auxiliary application to function, making it much easier to set up and use. Key Features of Tamper Dev (2026):
Complete control over traffic, SSL decryption, sophisticated rule-based editing. Best for: Professional penetration testing and debugging. How to Use Tamper Dev in Chrome: A Step-by-Step Guide
: Click Send or Resume to pass the modified data through. Alternative Extensions tamper data chrome
: Observing encrypted traffic and server reactions interactively during the development process. Are you planning to use these for security testing web development troubleshooting? Web Scraping with Tampermonkey - doug.human
Native extension feel, supports modern HTTPS security standards, active development. Best for: Real-time, in-browser request modification. 2. ModHeader - Modify HTTP Header
Given the demand, the Tamper Dev concept has been revived in a -compliant version, published by a developer named DefenseArk. Best for: Professional penetration testing and debugging
For complex, full-application testing, dedicated proxy tools like or Fiddler are superior to extension-based solutions.
return true; );
For complex security testing, browser extensions can sometimes feel limiting. Professional penetration testers usually graduate from browser extensions to dedicated interception proxies. Are you planning to use these for security
Google itself created a direct successor to the "Tamper Data" concept for Chrome called . Tamper Chrome allowed developers to monitor all requests, modify them before they were sent to a server, and even modify some parts of the response (like CSS, JavaScript, or AJAX responses). For a while, it was a powerful go-to tool.
: Click the toggle to start intercepting.
Manually changing API payloads to see how a backend server handles unexpected data structures.