Input Validation

Never trust user input. Validate everything before it touches your database.

Overview

Never trust user input. Validate everything before it touches your database.

Code Example

if (typeof req.body.email !== "string" || !req.body.email.includes("@")) {\n  throw new Error("Invalid email");\n}

Web Development Context

In modern web development, understanding Input Validation is crucial. Node.js is widely used for building APIs, real-time applications, and microservices. Mastery of this concept allows you to build efficient, scalable, and secure backend systems.

Common Mistakes

• Blocking the event loop with heavy synchronous tasks.
• Exposing secrets in code instead of environment variables.
• Forgetting to handle promise rejections.

Next Steps

To solidify your understanding, review the related references and try out the practice challenges.