prototype-pollution

Prevent prototype pollution by filtering dangerous keys like __proto__ and constructor during deep merges, using null-prototype objects, and applying guarded merging strategies to block malicious input from modifying the global Object prototype.

Prototype pollution is a vulnerability where unsafe deep merges or dynamic property copying allow user input to modify the global Object prototype, which can compromise JavaScript application security by injecting malicious properties.

Secure lodash merge and Object.assign by filtering dangerous prototype keys during property copying and using safe data structures like Object.create(null) to prevent dynamic property assignment from modifying the global prototype.

Yes, this prototype pollution detection works with TypeScript input validation by identifying unsafe deep merge patterns and recommending safe merging strategies to protect web services and library development from constructor pollution.

Filter dangerous prototype keys during code review when examining deep merges, clones, or dynamic property assignments that accept user input, ensuring that unsafe patterns cannot modify the global Object prototype.

The best way to safely deep merge user input in JavaScript is to use null-prototype objects and guarded merging strategies that filter dangerous prototype keys, preventing prototype pollution vulnerabilities in web services.