API Inspector - XHR & Fetch Debugger, by Vaishali, is a Chrome extension that concentrates API traffic for focused debugging. It captures Fetch and XMLHttpRequest calls in a dedicated interface so developers can inspect JSON payloads and headers while tracking schema changes in real time. The extension reduces non-API noise and speeds endpoint lookup. Frontend developers, full-stack engineers, and QA testers get a compact tool for validating API communications during development.

How narrowly does it isolate API requests?

API Inspector purposely narrows the network view to HTTP API exchanges rather than showing static assets. The extension removes unrelated resource clutter, making it easier to find request-response pairs when an application issues many images, stylesheets, or scripts. That focused approach supports workflows where the goal is to validate REST or GraphQL payloads instead of profiling every browser resource.

How effective is its schema-change detection?

The extension performs automatic JSON schema extraction and highlights structural differences, so developers can spot added, removed, or type-changed fields. Side-by-side comparisons show field-level deltas, which helps detect breaking changes during integration tests. This behavior supports continuous validation of API responses when backend changes could affect front-end rendering or contract-based clients.

How does it fit into everyday debugging workflows?

The tool supplies features that speed inspection without external setup: pretty-printed JSON with syntax highlighting, persistent case-insensitive filtering to find endpoints quickly, one-click copying of headers and bodies, and dark mode for low-light sessions. It processes data locally in the browser, so no analytics or external uploads occur, and it is compatible with Chrome and other Chromium-based browsers.

What are the extension's practical limits?

The extension focuses on HTTP(S) Fetch and XHR traffic only, so it does not capture WebSocket streams and cannot inspect chrome:// or other internal extension pages because of browser security. That narrow scope makes it unsuitable as a full replacement for the browser's Network panel when a complete resource timing or WebSocket trace is required.

Who should add this tool to their toolbox?

API Inspector is a practical option for developers who need a reduced-noise view of HTTP API communications rather than full network telemetry. It sacrifices breadth for a quicker path to validating API responses, so combine it with the browser's native Network panel when you need timing, resource waterfall views, or protocol-level traces. Tip: run both tools side by side to keep broad telemetry while using the extension for rapid API checks.