Fiddler for Windows

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Fiddler Web Debugger 5.7.1 for Windows

Fiddler Web Debugger Latest Update

Fiddler for Windows Features:

Web and HTTP Debugging and Troubleshooting Made Simple

Uncover software bugs when HTTP communication is involved. The Fiddler set of tools helps you promptly identify errors to effectively fix them. Easily.

Fiddler: One Product Family, Multiple Debugging Tools

Capture Traffic on Your Machine

Fiddler is a web debugging proxy tool for Windows, macOS and Linux. It has evolved from Fiddler Classic into a more robust and versatile product - Fiddler Everywhere. Fiddler Everywhere is now the only HTTPS debugger version in active development and with dedicated support, and a powerful tool for developers and QA professionals that offers:

Multiple options for capturing, including from remote device

Support for multiple protocols

Extensive Rules for modifying traffic

Advanced filters for narrowing down traffic

Offline mode

SOC 2 certification, and a lot more

Get Network Logs from Your Customers' Machines

Fiddler Everywhere Reporter is a free cross-platform traffic capture tool which allows you to:

Start instantly without installation, perfect for restricted-permission environments

Skip registration or licensing, ensuring a faster and hassle-free setup

Capture data easily even as a non-technical user

Receive web traffic from end users or internal teams for debugging

Integrate Network Capturing into Your Application

FiddlerCore is an embeddable .NET library which enables you to:

Integrate traffic capture capabilities directly into your code

Monitor and analyze traffic within your application

Gain deep insights and superior performance analysis

Discover delays, missing services and threats in minutes not days

Fiddler for Windows Info:

How to Start Your Fiddler Journey

how-it-works

Try the Fiddler product(s) and the web debugger that aligns with your needs.

Integrate Fiddler into your workflow for rapid, elegant debugging and troubleshooting.

 

You’ll start realizing the high value of benefits of Fiddler through the acceleration of both your time and cost savings.

Hundreds of Thousands of Organizations

are Using Fiddler

Join these companies and the 4 million developers who are already building, running, and debugging with Fiddler proxy tools.

Network Debugging 

Network debugging is the process of identifying and resolving issues in web applications by inspecting and modifying HTTP/S traffic between a client, usually a web browser, and a server. It involves using tools to intercept, analyze, and manipulate web requests and responses, allowing developers to troubleshoot problems, optimize performance, and ensure security and functionality. Common tasks in web debugging include examining network traffic, checking for errors in code, and testing how the application behaves under different conditions. Fiddler Everywhere is a powerful web debugging proxy to facilitate your debugging efforts and optimize your processes.

Bug 

An error, flaw, or fault in a software program that causes it to produce incorrect or unexpected results or behave unexpectedly. 

Breakpoint 

A marker set in the code where the execution will pause, allowing developers to inspect the state of the application at that specific point. 

Request/Response 

The basic communication model in web debugging, where a client sends a request to the server, and the server returns a response. Analyzing these helps identifying issues. 

Network Capturing 

The process of intercepting, recording, and analyzing data packets as they travel across a network, allowing developers and QA professionals to monitor the communication between devices, identify issues, diagnose problems, and ensure the security and performance of networked applications.

Logging 

The process of recording detailed information about the application's execution, often used to track events, errors, and data flow, which helps in identifying issues during debugging. 

HTTP/HTTPS 

The main protocols for web communication, where HTTP (Hypertext Transfer Protocol) and HTTPS (HTTP Secure) are used to send and receive data between a client and a server. 

Cookies 

Small pieces of data used to track user activity that the web server generates and sends to a web browser, which stores the cookies for a predetermined period of time. Debugging often involves inspecting cookies to ensure they are set, sent, and received correctly. 

Fiddler for Windows Information:

Fiddler is a web debugging proxy tool for Windows that captures, logs, monitors, and inspects HTTP and HTTPS traffic between a device and the internet. It allows users to troubleshoot client-side issues with web applications and analyze network traffic. Fiddler is available in several versions, with Fiddler Classic being freeware. 

What is Fiddler?

Here's a more detailed breakdown:

Web Debugging Proxy:

Fiddler acts as a proxy between your client (e.g., browser) and the web server, allowing you to inspect and modify traffic. 

HTTP/HTTPS Traffic:

It captures, logs, and analyzes both HTTP and HTTPS traffic, making it suitable for debugging web applications that use secure connections. 

Troubleshooting Client-Side Issues:

Fiddler helps you identify and resolve problems with web applications on the client-side by providing detailed information about the network traffic. 

Offline Copy and Replay:

It can also help create offline copies of websites or images, and replay HTTP traffic for testing purposes. 

Various Versions:

Fiddler is available in different versions, including Fiddler Classic, which is freeware, and Fiddler Everywhere, which is a modern, cross-platform version with more advanced features. 

Free and Commercial Options:

Fiddler Classic is free, while Fiddler Everywhere is a commercial product offering more features and capabilities. 

How do I download and install the product?

After initiating your product download, Fiddler Everywhere is delivered as an executable file extension (exe, dmg, or app image) based on your Windows, macOS or Linux selection.

Run the Fiddler Everywhere file to start the installation process. Then, create your Telerik account.

Check your inbox! Open the confirmation email sent by Fiddler Everywhere and follow the instructions to complete the registration.

How do I install new versions of the product I bought?

When you open the Fiddler Everywhere, the system automatically checks for updates. If there is a new update or version, a dialog box will appear, prompting you to proceed with the update. The updates are mandatory, and we officially support only the latest application version.

Get Fiddler for Windows