Web Debugger Fiddler

The tool provides browser-based HTTP debugging and API inspection by processing imported HAR files or locally captured sessions. It presents each request and its corresponding response with headers, bodies, cookies, and timing data. Conceptually, HTTP parsing and formatting are performed in-browser to avoid external dependencies, enabling rapid investigations in development and test environments. Users benefit from a centralized view of traffic, with filters by host, method, status code, and path to pinpoint failures. Unique value lies in client-side accessibility, easy import/export, and the ability to examine payloads without leaving the local environment. Core features include a per-request view, headers and body viewers, timing breakdowns, and deterministic formatting for comparison. Use cases cover diagnosing a failing /auth flow, validating CORS headers, and auditing sensitive fields in responses. The tool also supports exporting artifacts to CI pipelines, enabling automated quality checks and reproducible debugging sessions.