Adding various security features

[namanl2001]

Adding various security features

[udaymittal7]

Helmet is used to set various http headers and http headers can leak sensitive information. It also protects from clickjacking.

NoSQL injection vulnerabilities allow attackers to inject code into commands for databases that don’t use SQL queries, such as MongoDB. I will protect it using express-mongo-sanitize package.

XSS( Cross Site Scripting ) attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. I will protect it using xss-clean package.

[Namanl2001]

Thanks! there is already a PR for rate-limiter.
Could you explain a bit about other security features. And what are the benefits

[Namanl2001]

Interesting

[Namanl2001]

closing via #79