Advanced REST Client!

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. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.

Postman helps you be more efficient while working with APIs. Postman is a scratch-your-own-itch project. The need for it arose while one of the developers was creating an API for his project. After looking around for a number of tools, nothing felt just right. The primary features added initially were a history of sent requests and collections. A number of other features have been added since then. Here is a small list.

Eviware, the maker of soapUI, Web Service Testing Leader

Debug APIs like a human, not a robot.

Runscope helps you monitor, log and measure API usage to solve API problems fast. Automatically monitor APIs without any coding. Runscope provides complete logging for all of your API traffic. Track down troublesome API calls with powerful search. Debug problems by peering into the details of every request and response. Works with any public or private API, behind the firewall or in the cloud.

A REST client for almost any web service (Firefox and Chrome extension).

APIs are essential to every online business. StopLight helps companies manage their API lifecycle. Our visual modeling solution removes the massive amount of manual effort needed today, and instead reduces friction, and improves efficiency, across all API stakeholders.

Powerful, modern HTTP / REST client for Sublime Text. Requester has an expansive feature set, modern UX, powerful, elegant syntax and first class support for API testing and test automation. It runs on macOS, Windows and Linux. Some features:

apptalk.ninja is a great, easy-to-use tool for app developers tackle that monitors and debugs issues with their apps’ communication over-the-air.

Features• It is owned and supported by a friendly community. Not a corporation. • More secure because its code is publicly available for review and contributions on GitHub at https://github.com/chao/RESTClient • Add-on for Mozilla Firefox at https://addons.mozilla.org/en-US/firefox/addon/restclient/ • Supports all HTTP methods RFC2616 (HTTP/1.1) and RFC2518 (WebDAV)• You can construct custom HTTP request (custom method with resources URI and HTTP request Body) to directly test requests against a server.• Basic Authentication• OAuth authentication• OAuth2 authentication• Custom Header• Load request file• Show HTTP request execution time• Remember favorite requests• Import or export favorite requests• Manage favorite requests• Switch to percentage page layout• List request headers in tag• Various themes to choose from »