Fiddler
Fiddler is a free web debugging proxy which logs all HTTP(S) traffic between your computer and the Internet. It allows developers to inspect traffic, set breakpoints, and fiddle with incoming or outgoing data. Fiddler can be used to debug traffic from virtually any application th
proxy
http
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traffic-inspection
breakpoints
Fiddler: Free Web Debugging Proxy
Fiddler is a free web debugging proxy which logs all HTTP(S) traffic between your computer and the Internet. It allows developers to inspect traffic, set breakpoints, and fiddle with incoming or outgoing data. Fiddler can be used to debug traffic from virtually any application that supports a proxy like web browsers, mobile apps, IoT devices, and more.
What is Fiddler?
Fiddler is a free web debugging proxy developed by Telerik that logs all HTTP(S) traffic between your computer and the Internet. It sits between your computer and the servers you communicate with acting as a proxy that allows you to intercept, inspect, modify, and debug traffic.
Some key features of Fiddler include:
- Session analysis - Inspect all HTTP(S) traffic, set breakpoints, and fiddle with requests/responses.
- Modify or drop traffic - Change request/response headers and body content or drop traffic.
- Generate traffic - Create custom requests to test services.
- Supports any application - Debug traffic from web browsers, apps, IoT devices, and more as long as they can route through a proxy.
- Scripting - Automate tasks by writing FiddlerScripts in JScript.NET.
- Decrypt HTTPS traffic - Fiddler generates certificates to decrypt HTTPS traffic for inspection.
Fiddler can be used for tasks like debugging web application issues, testing APIs, reverse engineering mobile app traffic, benchmarking performance, mocking responses, and automating tests. It's a versatile HTTP debugging proxy tool for developers and testers who need deep inspection and control of network traffic.
Fiddler Features
Features
- HTTP/HTTPS traffic interception and inspection
- Session analysis and manipulation
- Breakpoints and conditional breakpoints
- HTTPS traffic decryption
- Automatic request resending
- Scripting support
Pricing
- Free
- Open Source
Pros
Free and open source
Powerful debugging features
Supports all major platforms
Large user community and documentation
Cons
Steep learning curve
Can slow down traffic
Potential privacy concerns with HTTPS decryption
Limited native mobile app support
Official Links
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