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Off-by-one errors (OBOEs) are among the most common logic bugs, even for seasoned developers. These bugs occur when a loop or operation goes one iteration too far or one iteration too short-leading to incorrect results, missed elements, or crashes.
They usually occur in:
Adding a metric counter that displays the total number of blog articles and documentation pages is a great way to make a Docusaurus site feel active.
However, since Docusaurus compiles your pages statically, you cannot call internal hooks like useBlogPosts() inside static landing pages (such as src/pages/index.js). Doing so causes server-side rendering (SSR) failures during build execution on platforms like Vercel.
This guide provides a robust, build-time solution that counts flat files, subdirectories, and nested folders, saving the results to a static JSON file that can be safely imported anywhere in your project.