The text discusses code injection vulnerabilities in JavaScript and Node.js applications, which can be exploited by attackers to execute malicious code. To prevent such attacks, developers should avoid using dynamic code execution functions like `eval()`, `setTimeout()`, and `setInterval()`, as well as the `Function` constructor. Additionally, they should use a security linter like ESLint with the `security` plugin to detect potential issues, and consider using a static code analysis tool like Snyk Code to identify vulnerabilities in third-party dependencies and user-controlled input. By following these best practices, developers can significantly reduce the risk of code injection attacks in their applications.