What is Fiddler?

Leverage the capabilities of Telerik Fiddler HTTP(S) proxy to capture all web traffic flowing between your computer and external websites, which enables you to examine that traffic, establish breakpoints, and adjust both requests and responses as needed. Fiddler Everywhere acts as a flexible web debugging proxy that is compatible with macOS, Windows, and Linux operating systems. It allows for the capturing, inspection, and monitoring of all HTTP(S) communications, making it easier to mock requests and address network issues. This tool can be utilized with any browser or application, providing the ability to debug traffic on macOS, Windows, Linux, and mobile devices running either iOS or Android. It ensures the proper exchange of essential cookies, headers, and caching settings between the client and server. Supporting a variety of frameworks including .NET, Java, and Ruby, Fiddler Everywhere equips you with the tools to efficiently mock or modify requests and responses on any website. This user-friendly approach enables testing of website functionality without necessitating any code changes. With Fiddler Everywhere, you can comprehensively log and analyze all HTTP/S traffic between your machine and the broader internet, thereby enhancing your debugging efficiency and allowing for more in-depth inspection of network interactions. Ultimately, this tool streamlines the process of identifying and resolving issues that might affect your web applications.

Pricing

Price Starts At:
$12 per user per month
Free Version:
Free Version available.

Integrations

No integrations listed.
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Screenshots and Video

Fiddler Screenshot 1
Fiddler Screenshot 1

Company Facts

Company Name:
Progress Software
Date Founded:
1981
Company Location:
United States
Company Website:
www.telerik.com/fiddler

Product Details

Deployment
Windows
Mac
Linux
Training Options
Documentation Hub
Support
Web-Based Support

Product Details

Target Company Sizes
Individual
1-10
11-50
51-200
201-500
501-1000
1001-5000
5001-10000
10001+
Target Organization Types
Mid Size Business
Small Business
Enterprise
Freelance
Nonprofit
Government
Startup
Supported Languages
English

Fiddler Categories and Features

Packet Analyzers

Debugging Tool

Bug Tracking Software

Backlog Management
Filtering
Issue Tracking
Release Management
Task Management
Ticket Management
Workflow Management

API Testing Tool

Functional Testing
Fuzz Testing
Load Testing
Penetration Testing
Runtime and Error Detection
Security Testing
UI Testing
Validation Testing

More Fiddler Categories

Fiddler Customer Reviews

Write a Review
  • Reviewer Name: A Verified Reviewer
    Position: Principal Software Engineer
    Has used product for: 2+ Years
    Uses the product: Daily
    Org Size (# of Employees): 100 - 499
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Great tool for examining HTTP requests

    Updated: Aug 12 2022
    Summary

    Fiddler is a great tool for local examination of network packets. It's intuitive and powerful, and free. A great option for testing network security.

    Positive

    - very handy for examining details of HTTP requests, including headers, payload, cookies, etc
    - simple UI is very intuitive
    - can tunnel into local network traffic on user's PC and decrypt it to monitor outbound requests
    - traffic recording and playback
    - load test functionality
    - free

    Negative

    - not as pretty as alternatives like Postman
    - not great for organizing groups of requests (say, for documenting REST API structure)
    - no synchronization of settings or data between users like in Postman

    Read More...
  • Reviewer Name: Gaurav P.
    Position: Sr. QA Engineer
    Has used product for: 1-2 Years
    Uses the product: Daily
    Org Size (# of Employees): 5,000 - 9,999
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Fiddler is one of the best open-source product for security engineers

    Updated: Jul 04 2021
    Summary

    Fiddler is one of the best open-source applications to find the vulnerabilities of the application. Fiddler is based on client-server architecture.
    Fiddler logs the traffic flowing between your computer and the internet. We can debug application traffic that supports proxy. Such applications include browsers like Chrome, Safari, Firefox, Opera, etc.
    Fiddler has different versions like Fiddler Everywhere, Fiddler Classic for Windows, FiddlerCore, and FiddlerCap.
    I am highly recommending it to security testers and developers.

    Positive

    I'm using fiddler to find the vulnerabilities of the application. We can perform penetration testing using fiddler and find several major security-related issues such as CSRF Attack, XSS Attack, SQL Injection, IDOR, Authentication & Authorization, File Upload, Password strength.
    Fiddler provides a detailed overview of the application URLs and with status code and protocols.
    We can quickly analyze the security test results by their priority and severity and export them.
    Fiddler is a web debugging proxy tool and supports multiple proxies such as Firefox, Chrome, Safari, Internet explorer. We need to export the certificate by fiddler and import it on the browser's network settings section.

    - Open-source penetration testing tool.
    - It supports any client-server ar.
    - Tracking cache, cookies & headers
    - Traffic recording and playback mechanism
    - Easy to learn and use it.
    - Decrypt HTTP and HTTPS traffics
    - Formation of any HTTP request feature
    - Autoresponder & Inspection feature
    - We can manipulate the sessions
    - We can perform Load testing as well.
    - It available in multiple flavors like Fiddler Everywhere, Fiddler Classic for Windows, FiddlerCore, and FiddlerCap.

    Negative

    No Cons. It is very useful for me during security testing. Thank you, Fiddler.

    Read More...
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