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NoPP

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Free
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02 Nov 2022
10 September 2025
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NoPP (No Prototype Pollution) is a tiny helper designed to protect against Prototype Pollution vulnerabilities in your application by calling Object.freeze for some built-in JavaScript objects. By freezing an object, it prevents new properties from being added, existing properties from being removed, and values from being changed, ensuring that prototype changes only occur during initialization.

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