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HTTP(S) 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. Hoppscotch is an open-source API development ecosystem. It helps you create your requests faster, saving you precious time on your development.

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    1.  Ad-freeHoppscotch doesn't contain any form of external advertising.
    2.  Command line interfaceHoppscotch either have CLI support or is a CLI-only app.
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  4. Charles icon
    • Mac
    • Windows
    • Linux
    • iPhone
    • iPad
    29 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. HTTP Toolkit icon
    • Mac
    • Windows
    • Linux
    • Online
    42 alternatives to HTTP Toolkit 

    HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools from Docker to Android to GraphQL.

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  6. Requestly icon
    • Mac
    • Windows
    • Linux
    • Online
    • Microsoft Edge
    • Google Chrome
    • Software as a Service (SaaS)
    • Selenium
    • Firefox
    15 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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  7. Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.

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  8. HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers.

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  9. SmartSniff icon
    • FreeProprietary
    • Windows
    33 alternatives to SmartSniff 

    SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers. You can view the TCP/IP conversations in Ascii mode (for text-based protocols, like HTTP, SMTP, POP3 and FTP) or as hex dump (for non-text base...

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    1.  PortableSmartSniff can be used from a USB stick or similar with no prior installation.
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  10. A HTTP Debugging Proxy for MacOS.

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  11. HttpFox icon
    • Mac
    • Windows
    • Linux
    • Waterfox
    • Pale Moon
    28 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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  12. James icon
    • Mac
    • Windows
    • Linux
    • React
    • Electron / Atom Shell
    • Node.JS
    8 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. 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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  14. Amialive icon
    • Mac
    • Linux
    24 alternatives to Amialive 

    Visual HTTP client and collaboration tool.

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    1.  Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
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  15. 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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