While not a browser extension, the or desktop app is the industry standard for API development and testing.
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is the professional evolution of what tools like Tamper Data started. tamper data chrome
Understanding how data is tampered with highlights why . While not a browser extension, the or desktop
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You don't always need an extension. Chrome's native (F12) has advanced features that mimic "tampering": Edit and replay XHR chrome/firefox etc? - Stack Overflow
is considered the most direct, modern replacement for Tamper Chrome. It allows you to intercept and edit HTTP/HTTPS requests and responses in real-time, often without needing an external proxy.