Next.js SSR DevTools is a Chrome extension designed to aid developers in inspecting server-side fetch calls made by Next.js applications. This tool addresses a common issue where fetch calls in Server Components are not visible in the standard Network tab of Chrome DevTools, as these calls execute on the Node.js server. With this extension, developers can access a dedicated 'SSR Fetches' panel that displays essential information such as URLs, headers, status codes, and response bodies, facilitating a more efficient debugging process.

Key features of the Next.js SSR DevTools include a clear overview of fetch calls with color-coded HTTP methods and status codes, auto-redaction of sensitive headers, and the ability to view pretty-printed JSON responses. The extension also supports light and dark modes, follows system preferences, and offers auto-refresh capabilities. To set up the tool, users must install a companion server package and configure their Next.js project accordingly, making it a valuable asset for frontend developers, QA teams, and anyone seeking to streamline their debugging workflow.