Instruction: List and explain several security best practices for Next.js applications.
Context: This question aims to gauge the candidate's awareness of security practices within Next.js applications.
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First and foremost, Content Security Policy (CSP) is a security standard that I always ensure to implement. CSP helps in preventing Cross-Site Scripting (XSS) attacks by specifying trusted sources for content like scripts, images, and styles. In Next.js, this can be achieved through the creation of a custom _document.js file and setting the CSP headers using the setHeader method in Next.js API routes or by configuring your server to include these headers in responses.
Another practice I adhere to is validating and sanitizing user input. Next.js applications often involve receiving user input through forms or API endpoints. It's crucial to validate this input on the server side, even if it's already been validated on the client side, to prevent SQL injection and...