Liran Tal • 5/14/2018

How a RegEx can bring your Node.js service down

This technical article details the risks of Regular Expression Denial of Service (ReDoS) in Node.js applications. It explains how a poorly written regex pattern can lead to catastrophic backtracking, blocking the event loop and consuming excessive CPU. The author provides examples, demonstrates the impact, and offers solutions like using trusted third-party libraries (e.g., validator.js) and linting tools (e.g., safe-regex) to write secure and performant regex patterns.

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#Node.js #security #performance