Why Developers Should Never Trust User Input, Frontend or Backend

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A software developer argues that applications frequently fail due to flawed assumptions about how users will interact with them, regardless of the developer's experience level. The author illustrates this with a real incident where students submitted local file paths instead of URLs in a college software form, highlighting how even harmless misuse can expose gaps in input validation. The article emphasizes that frontend validation alone — using HTML attributes or JavaScript checks — is insufficient, as users can bypass it using browser developer tools. Backend validation is therefore essential, not just to reduce server load but also to strengthen application security. The developer recommends treating all user input as untrusted and validating it thoroughly on the server side as a fundamental software engineering practice.

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