is a web (HTTP / HTTP Monitor) that runs on your own
computer. Your web browser (or any other Internet application) is then
configured to access the Internet through Charles, and Charles is then
able to record and display for you all of the data that is sent and
In Web and Internet development you are unable to see
what is being sent and received between your web browser / client and
the server. Without this visibility it is difficult and time-consuming
to determine exactly where the fault is. Charles makes it easy to see
what is happening, so you can quickly diagnose and fix problems.
Charles makes debugging quick, reliable and advanced; saving you time and frustration!
SSL – view SSL requests and responses in plain text Bandwidth Throttling to simulate slower Internet connections including latency AJAX debugging – view XML and JSON requests and responses as a tree or as text AMF – view the contents of Flash Remoting / Flex Remoting messages as a tree Repeat requests to test back-end changes Edit
requests to test different
inputs Breakpoints to intercept and edit requests or responses Validate recorded HTML, CSS and RSS/atom responses using the W3C validator
following features are what I believe to be the key features of
Charles. The best way to explore these features and to discover others
is to download the free trial.
Charles can act as a man-in-the-middle for HTTP/SSL communication, enabling you to debug the content of your HTTPS sessions.
simulates modem speeds by effectively throttling your bandwidth and
introducing latency, so that you can experience an entire website as a
modem user might (bandwidth simulator).
useful for XML development in web browsers, such as AJAX (Asynchronous
that is flowing between the client and the server. Charles natively
supports JSON, JSON-RPC and SOAP; displaying each in a simplified tree
format for easy viewing and debugging.
great for Adobe Flash developers as you can view the contents of
LoadVariables, LoadMovie and XML loads. Charles also has native support
for Flash Remoting (AMF0 and AMF3).