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Web Debuggers

  1. Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and "fiddle" with incoming or outgoing data.

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  2. mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP. It provides a console interface that allows traffic flows to be inspected and edited on the fly. It also features mitmdump, a commandline tool that provides a tcpdump-like interface for saving, viewing and...

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  3. The Google Chrome Developer Tools provide an integrated environment for debugging, optimizing, and understanding a web application, or website, running in Google Chrome. The developer tools are developed partly through the WebKit open source project, where the tools are called...

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  4. Charles icon
    • Mac
    • Windows
    • Linux
    • iPhone
    • iPad
    31 alternatives to Charles 

    Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

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  5. Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.

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    1.  Syntax HighlightingFirefox Developer Tools supports syntax highlighting for various programming and markup languages.
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  6. Requestly icon
    • Mac
    • Windows
    • Linux
    • Online
    • Microsoft Edge
    • Google Chrome
    • Software as a Service (SaaS)
    • Selenium
    • Firefox
    17 alternatives to Requestly 

    Requestly is a lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc.

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    1.  LightweightRequestly consumes less device resources compared to similar apps.
    Modify HTTP Headers
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  7. HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers.

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  8. Working quietly on the Menubar, Surge is a high-performance HTTP/SOCKS5 proxy server. It is capable of intercepting and logging the summary of HTTP traffic, and meanwhile transmitting the traffic to other proxy servers according to the flexible rule system.

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  9. The goal of this project is to adds information about the HTTP headers in three ways:

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    1.  Support for Multiple MonitorsLive HTTP Headers supports the use of multiple displays.
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  10. HttpFox icon
    • Mac
    • Windows
    • Linux
    • Waterfox
    • Pale Moon
    22 alternatives to HttpFox 

    HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers.

    Discontinued

    The project is no longer developed. Last version, 0.8.14.1, released in May 2014, is not compatible with Firefox, but the extension still works on XUL-based Firefox forks like Waterfox icon Waterfox and Pale Moon icon Pale Moon

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  11. Live HTTP Headers logs all HTTP traffic between Google Chrome and the Internet.

    Warning

    Suspected of distribute adwares, even after removing the extension

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  12. James icon
    • Mac
    • Windows
    • Linux
    • React
    • Electron / Atom Shell
    • Node.JS
    9 alternatives to James 

    James is a HTTP Proxy and Monitor that enables developers to view and intercept requests made from the browser. It is an open-source alternative to the popular developer tool Charles.

    Discontinued

    Not sure if 'discontinued' is quite right, but James has now officially moved in 'maintenance mode', with little or no ongoing development or support. See the readme: https://github.com/james-proxy/james#this-project-is-in-maintenance-mode.It would be helpful to highlight that here imo.

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  13. Cross platform Web debugging proxy.

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  14. Proxy.app is the perfect tool for debugging and analysing both HTTP requests and responses and modify data in transit. It can be used to debug hard problems while doing web development or as a penetration testing tool during security assessments.

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  15. HTTP Headers allows you to quickly see the HTTP header information for the current URL.

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    Warning

    Suspected of distribute adwares, even after removing the extension

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