Why Using “null” as a Username Breaks Your App and How to Prevent It

This article explains how treating the string "null" as a valid username can cause user‑experience glitches, log‑debugging nightmares, database contamination, security risks, and automation failures, and provides concrete backend, frontend, and database validation techniques to avoid these pitfalls.

NULLusername

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Why Using “null” as a Username Breaks Your App and How to Prevent It