Test new features and legacy code by inspecting network traffic and composing rules to diagnose potential problem scenarios, before they occur in production.

Test applications by analyzing network traffic

Use Fiddler Everywhere to test applications by capturing HTTP/S network traffic and monitor HTTP/2 and WebSocket sessions. Look beyond the UI by capturing and analyzing network traffic which contains all the communications between the frontend and the backend. Find which requests are failing, which API is responding slowly, which API is returning an invalid response, if the used protocol version is causing problems, and help your dev teams to reproduce the issues.


Diagnose poor network conditions, latency, and unexpected responses

Testing applications for an “unhappy path” is equally important as testing for a “happy path”. Fiddler Everywhere helps application testers test complex scenarios such as a disconnected network, how an application behaves under low latency conditions, and when an unexpected response is returned by the server.


Analyze, highlight, and add context to sessions

Analyze captured traffic by setting filters, highlight the sessions that are causing issues, and add more context to your analysis by adding comments.


Share with your development team

Sharing the logs with your development team is seamless and contextual with Fiddler Everywhere. No more attaching logs to emails or support tickets; share captured traffic and context that was added with the click of a button.

Fiddler Key Features

Live Traffic Inspection

Inspect and debug traffic from macOS, Windows, and Linux systems (as well as iOS and Android devices). Ensure the proper cookies, headers, and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Angular, React, Vue.js, and more.

Rule Builder

Fiddler Everywhere’s Rule Builder enables you to identify/intercept traffic and have the debugging proxy respond on behalf of the remote server. Create rules that automatically trigger a response by returning a previously captured session, status code, local file, and so on — all without touching the server.

Save and Share Sessions

Network sessions captured by Fiddler Everywhere can be saved into workspaces and replayed later. These same sessions can also be shared (and commented on) with your teammates within the Fiddler Everywhere UI. The Fiddler Everywhere client provides a secure method for collaboration to boost productivity. 


Next Steps